Tag Archives: audio

apple, audio, music industry, rants

Dear audio industry, fix mastering before bothering with high resolution

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The audiophile world (small niche though it is) is buzzing with a renewed interest in high resolution audio, now to be known as HRA.

See, for example, Why the Time is Right for High-Res Audio, or Sony’s new Hi-Res USB DAC System for PC Audio, or Gramophone on At last high-resolution audio is about to go mainstream, or Mark Fleischmann on CD Quality Is Not High-Res Audio:

True HRA is not a subtle improvement. With the best software and hardware, a good recording, and good listening conditions, it is about as subtle as being whacked with a mallet, and I mean that in a good way. It is an eye opener. In lieu of “is that all there is?” you think “wow, listen to what I’ve been missing!” … The Compact Disc format is many good things but high-res it is not. It has a bit depth of 16 and a sampling rate of 44.1 kHz. In other words, it processes a string of 16 zeroes and ones 44,100 times per second. Digitally speaking, this is a case of arrested development dating back to the early 1980s. We can do better now.

As an audio enthusiast, I would love this to be true. But it is not. Fleischmann appears to be ignorant of the Nyquist-Shannon sampling theorem, which suggests that the 16-bit/44.1 kHz CD format can exactly reproduce an analogue sound wave from 20–22,050 Hz and with a dynamic range (difference between quietest and loudest signal) of better than 90Db.

Yes there are some ifs and buts, and if CD had been invented today it would probably have used a higher resolution of say 24-bit/96 Khz which gives more headroom and opportunity for processing the sound without degradation; but nevertheless, CD is more than good enough for human hearing. Anyone who draws graphs of stair steps, or compares CD audio vs HRA to VHS or DVD vs Blu-Ray, is being seriously misleading.

Yes, Sony, you are a disgrace. What is this chart meant to show?

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If shows that DACs output a bumpy signal it is simply false. If it purports to show that high-res reproduces an analogue original more accurately within the normal audible range of 20-20,000 Hz it is false too.

As an aside, what non-technical reader would guess that those huge stair steps for “CD” are 1/44,100th of a second apart?

The Meyer-Moran test, in which a high-res original was converted to CD quality and then compared with the original under blind conditions (nobody could reliably tell the difference), has never been debunked, nor has anyone conducted a similar experiment with different results as far as I am aware.

You can also conduct your own experiments, as I have. Download some samples from SoundKeeper Recordings or Linn. Take the highest resolution version, and convert it to CD format. Then upsample the CD quality version back to the high-resolution format. You now have two high-res files, but one is no better than CD quality. Can you hear the difference? I’ve yet to find someone who can.

Read this article on 24/192 Music Downloads … and why they make no sense and watch the referenced video for more on this subject.

Still, audio is a mysterious thing, and maybe in the right conditions, with the right equipment, there is some slight difference or improvement.

What I am sure of, is that it will be nowhere near as great as the improvement we could get if CDs were sensibly mastered. Thanks to the loudness wars, few CDs come close to the audio quality of which they are capable. Here is a track for a CD from the 80s which sounds wonderful, Tracy Chapman’s debut, viewed as a waveform in Adobe Audition:

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And here is a track from Elton John’s latest, The Diving Board:

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This everything louder than everything else effect means that the sound is more fatiguing and yes, lower fidelity, than it should be; and The Diving Board is far from the worst example (in fact, it is fairly good by today’s standards).

It is not really the fault of recording engineers. In many cases they hate it too. Rather, it is the dread of artists and labels that their sales may suffer if a recording is quieter (when the volume control is at the same level) than someone else’s.

Credit to Apple which is addressing this to some extent with its Mastered for iTunes initiative:

Many artists and producers feel that louder is better. The trend for louder music has resulted in both ardent fans of high volumes and backlash from audiophiles, a
controversy known as “the loudness wars.” This is solely an issue with music. Movies, for example, have very detailed standards for the final mastering volume of a film’s
soundtrack. The music world doesn’t have any such standard, and in recent years the de facto process has been to make masters as loud as possible. While some feel that overly
loud mastering ruins music by not giving it room to breathe, others feel that the aesthetic of loudness can be an appropriate artistic choice for particular songs or
albums.

Analog masters traditionally have volume levels set as high as possible, just shy of oversaturation, to improve the signal-to-noise ratio (SNR). With digital masters, the goal
is to achieve the highest gain possible without losing information about the original file due to clipping.

With digital files, there’s a limit to how loud you can make a track: 0dBFS. Trying to increase a track’s overall loudness beyond this point results in distortion caused by
clipping and a loss in dynamic range. The quietest parts of a song increase in volume, yet the louder parts don’t gain loudness due to the upper limits of the digital format.
Although iTunes doesn’t reject files for a specific number of clips, tracks which have audible clipping will not be badged or marketed as Mastered for iTunes.

Back to my original point: what is the point of messing around with the doubtful benefits of HRA, if the obvious and easily audible problem of excessive dynamic compression is not addressed first?

None at all. The audio industry should stop trying to mislead its customers by appealing to the human instinct that bigger numbers must mean better sound, and instead get behind some standards for digital music that will improve the sound we get from all formats.

apple, audio, gadgets, mobile, smartphones

DTS Headphone X surround sound from stereo is astonishing though Z+ music app disappoints

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I first heard the DTS surround sound from stereo demo at this year’s Mobile World Congress in Barcelona. The technology is called Headphone X. It was astonishing. You went into the Qualcomm Snapdragon 800 theatre – it was in association with Qualcomm become some DTS technology is baked into the latest Snapdragon chipset – sat in a plush armchair, and donned stereo headphones.

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The next thing you knew, sound was coming from front left. Then front right. Then rear left. The illusion was amazing, and I was not the only one who removed their headphones temporarily to check that they really were the sole source of the sound.

I interviewed the DTS folk about the technology, and also spoke to the guys at Dolby. Nothing new, said the Dolby folk, we’ve had virtual surround sound for years. Yet, the demo at the Dolby stand fell far short of what DTS was showing.

Now you can try it, if you have an Android or iOS device. Download the Z+ app and listen to the demo.

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I tried this on someone today, and his “Wow!” reaction showed that the demo is still astonishing. You know it is an illusion, but it sounds as if you are seated in the middle of a room with five or more speakers.

If DTS has proved that surround sound from stereo is possible, what are the implications? Surround sound has not failed exactly, but its inconvenience has limited take-up. Many surround mixes of music albums are now hard to find, because they were made for long out of print SACD or DVD-Audio releases. What if you could easily download all these mixes and enjoy them with stereo headphones or earbuds?

An enticing thought, but there are caveats. The Z+ app, for example, is disappointing once you get beyond the demo. The only album it plays is the Hans Zimmer soundtrack to the Superman film, Man of Steel. One track is included for free, and the others are in-app purchases. It sounds good, but the surround effect is less convincing than it is in the demo. I heard better music demos in Barcelona. I also get superior sound on the iPhone than on the iPad (it is an iPhone app), though I might be imagining it, and in both cases I get occasional stuttering, though that may be because I am not testing on the latest generation Apple hardware.

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An app that only plays one album is not a revolution in sound, and if this is to go mainstream, DTS needs to sell its technology to one of the major music download or streaming services and have it built-in to the client app. It has made a start, with its Qualcomm deal which is meant to be in shipping chipsets from “the second half of 2013” according to the information in Barcelona. My guess is that any problems with stuttering will be removed when there is hardware support.

How does it work? The DTS guys told that it “it’s psychoacoustics. You’re triggering the brain with responses that induce it to say, this is from here. It’s a combination of timing and frequency. That’s traditional virtualisation.” After that, they explained, they apply room acoustics that take the illusion to another level. This could be the room acoustic of the studio, achieving a holy grail for audio engineers, or that of the listener’s own room or a concert hall, for example. The room acoustic can be user-selectable, though this is not a feature of the current Z+ app.

There is a caveat that might upset hi-fi enthusiasts. Think about it. Virtual surround sound is delivered in stereo, which seems impossible, but then again we only have two ears. Our ears are designed to hear sounds more clearly if they are in front of us. Therefore, to simulate a sound coming from behind you, do you need to make it less clear?

I put this point to a guy from DTS, that parts of the music are in a sense deliberately distorted or muffled. “That occurs naturally by our head,” I was told. So is the fidelity of the sound reduced in order to achieve the surround illusion? “No differently than speakers in a surround system would do anyway,” he said.

Another caveat is that, by design, the system only works with headphones. Of course, if you have a full surround system in your room, you can play surround mixes in the normal way, turning to the DTS technology only for headphone listening. Headphones are also unable to recreate the effect of a sub-woofer which you can feel in your chest. “It’s a physical element. We’re not going to be able to replicate it,” said DTS.

Headphones are unbeatable though if you want to recreate the acoustic of a different room, such as the studio where the music was mixed. Further, for a mass market, delivering surround sound through a mobile device and standard earphones is the right approach.

The Z+ app is disappointing, but I would nevertheless encourage anyone with an interest in audio technology to download it and try the demo. Headphone X has huge potential and I shall follow its progress with interest.

audio

Linn music downloads: is the Studio Master worth the extra cost?

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I was interested to note from this feature in the Financial Times that more than half of the music downloads sold by Linn, a UK audio company, are of the “Studio Master” at 24 bit, 192kHz, rather than the cheaper MP3 or 16 bit, 44.1kHz as used for CDs. Apparently the MD Gilad Tiefenbrun had projected that the Studio Masters would only be 5% of sales, but in fact:

Even though Studio Master albums cost £18 compared with £5 for an MP3 version, these highest-quality recordings account for more than half of all downloads. That proportion rises to 90 per cent for classical recordings.

The question: why? Here are sample prices, in this case for Claire Martin’s Too Much in Love to Care:

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The prices range from £8.00 in 320k MP3 to £18.00 for the Studio Master. CD quality is £10.00. These are substantial differences. You could have more than twice as much music for the same money in MP3, and 80% more music in CD quality.

Linn says of the Studio Master:

If absolute sound quality is what you want then this file is best for you.

However, whether a Studio Master is audibly different from CD quality, if mastered to sound the same, is disputed. A well-known study, which has never been disproved as far as I am aware, found that music could be played through a 16/44.1 analog to digital to analog loop without listeners being aware of the difference. Science bears this out, to the extent that for music at normal listening levels the Shannon/Nyquist theorem indicates that the entire original music signal can be recovered up to half the sampling frequency, in this case 22kHz which is beyond the range of human hearing.

MP3 uses lossy compression, making the choice of CD quality over MP3 understandable (especially for only 25% extra cost), but even here most people struggle to hear the difference between MP3 at 320k and its original source. The folks at Hydrogen Audio have studied this obsessively; there is plenty of objective evidence.

Why then do people buy the Studio Master? Here are a few contenders.

1. Ignorance. Linn says (or strongly implies) that it sounds better, and Linn should know.

2. Anxiety. The buyer wants the best sound and is not sure whether or not the Studio Master might sound better, so rather than take a chance decides to cover herself with the premium download.

3. For further processing. When you process digital audio, the quality degrades. Studios therefore work with high resolution audio as they may process the audio multiple times. Given that most listeners are not running studios, I think we can dismiss this for most purchasers.

4. The Studio Master is mastered to sound better. This is an interesting possibility. Here is a comment from Linn’s forums:

When I converted the original 24bit FLAC file into an MP3 myself I was unable to hear any differences between them. But When comparing the Linn MP3 and 24bit FLAC versions I can hear a difference. This suggests to me that the difference I hear is due to Linn using two differently masterered versions for their MP3 and 24bit FLAC files.

The implication is that the MP3 and lossless versions could sound the same, for practical purposes, as the Studio Master; but either by accident or design it does not.

5. Is it possible that contrary to the evidence referenced above, high resolution audio (ie more than CD quality) does sound better? Certainly many people believe this. However, in my experience the number falls dramatically if you include only those who have done objective blind listening tests to verify it. Further, those who do experiment with objective tests invariably discover that the audible differences (if they exist) are very small.

The frustrating aspect of this is that in practice most CDs that you can buy, or MP3s you can download, sound worse than they should. There are many reasons for this, of which the biggest is probably the “loudness wars”, in which the dynamic range of 16/44.1 audio is squandered for the sake of the overall loudness of the audio, using compression and clipping to reduce the difference between the loudest and quietest passages.

Other common problems are that the best source tapes are not used, or that (in the case of older recordings) noise reduction damages the audio quality, or that the frequency response is adjusted for increased “boom and tizz” in the belief that this may sound more impressive.

High resolution recordings, such as those available on SACD, are generally (but not always) less prone to these problems, because they are designed for a more discriminating market. In other words, they sound better not because of high resolution itself, but for other reasons. Purchasers however may attribute the quality to the high resolution, making them inclined to purchase Studio Masters from Linn.

On the other hand, if Linn masters this music to sound the same in all formats, there is no reason the same logic should apply.

My suggestion: try one of Linn’s sample downloads. Do your own conversion of the Studio Master to CD quality or 320K MP3 and see if you can hear the difference using something like Foobar ABX. If you cannot tell the difference, there is no reason to buy the Studio Master unless Linn is deliberately making the other formats sound less good.

apple, audio, mobile, reviews, smartphones, tablets

Review: Three-in-one Jabra Revo headphones and headset: wired, wireless and USB

If headphones are judged on versatility, the Jabra Revo wins the prize. It works wired and wireless, it’s a USB audio device, it’s a headset with remote control, and as a final flourish it folds into a moderately compact size that you can slip in the supplied bag.

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You might think that the result of this flexibility would be a fiddly and complex device, but this is not the case. The Revo has an elegant design and looks modern and sleek. The construction feels high quality as well; these headphones are lovely to handle.

In the solid plastic box you get the headphones, a drawstring bag, a USB cable, an audio cable (with four connectors on each 3.5mm jack, suitable for a headset connection to a mobile phone or tablet. The cables are braided for tangle-free connections, and bright orange so you will not miss them.

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There is also a “Getting started” leaflet which I recommend you read, since not everything is obvious.

Step one is to charge the headphones. This is done using the USB cable. No charger is supplied, but you probably have a few of these already, or you can plug into any PC or Mac. A red light comes on while charging, and turns off when charging is complete, which takes about two hours from flat.

Step two is to pair the headphones with your mobile device. For this you can put a three-way on/off/pairing switch, tucked under the right-hand earphone, into the pairing position, for pairing in the normal way. Alternatively, just put it to the On position, and touch an NFC-enabled device to the left earphone (as I noted, not everything is obvious). This should then pair automatically, subject to a prompt on your mobile device.

I had mixed success with NFC. A Sony Xperia T smartphone failed twice, with a message “Could not pair Jabra Revo”, but worked on the third attempt. A Nokia Lumia 620 worked on the second attempt.

More than one device can be connected simultaneously, though only one at a time will play. I found this worked; I could play music on one device, then press play on another device and it automatically switched.

The good news is that Bluetooth audio worked well for me, with no skips or stutters, perhaps thanks to Jabra’s long experience with mobile communications. Volume was low to begin with, but note that the back of the right-hand earphone is also a touch volume control, and with a few strokes you can get more than enough volume.

There are also buttons at the centre of each earphone.

The right-hand button is multi-function, and does play/pause, or answer/end call, or reject a call if you hold it down, or redial last number if you double-tap.

The left-hand button is for the Jabra Sound App for iOS or Android. It is meant to launch the app, but this did not work for me with the Sony Xperia.

If you want to use the headphones wired, just plug the audio cable into the headphones. No battery power is required. If you want to use them as a USB device, attach the USB cable to a computer, wait for the drivers to install, and it works. I tried it with Skype and got reasonable results, though the microphone quality is less good than that of the headphones.

Jabra Sound app

If you have an Apple iOS or Google Android device, you can download the Jabra Sound app. This is a music player which claims to optimise sound for the headphones. The app is free but requires a code, supplied with the headphones, to activate it.

Using the app, you specify which Jabra headphones you are using. Next, you can set Dolby Processing, Mobile Surround, and Equalisation. If you turn Dolby Processing off, the other options are disabled as well.

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I am a sceptic when it comes to this kind of processing, and the Jabra Sound app did nothing to convince me that it is worthwhile. I listened to I.G.Y. by Donald Fagen, which is a well-recorded track, and found that adding “Mobile Surround” made it noticeably worse, less natural and less clear. The equalizer could be useful though, particularly as the Revo are not the most neutral headphones I have heard.

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Jabra Sound is a music player and only works with local music files. You cannot use it with Spotify or Google Play or other streaming services.

Revo in use

The comfort of these on-ear headphones is good, though tastes vary and I found them just a little stiff. Then again, wireless implies mobility and a firm fit is no bad thing.

How about the sound? There are a couple of points to note. First, all connections are not equal. I found that the wired connection sounds best, followed by the USB connection, followed by the wireless connection. That does not mean that wireless sounds bad, but I did find it slightly grainy in comparison. Only slightly; if you think Bluetooth audio means low quality sound, think again.

Second, the Revo seems to accentuate the bass, a little too much for my taste. This may be good marketing as many people seem to prefer this kind of sound, but if you want to hear what the mastering engineer intended you may prefer a more neutral sound.

These points aside, the sound is sweet, clear and refined. They are not reference quality, being easily bettered by, say, high-end Sennheisers, Judged purely on the basis of sound quality for the price, the Revo is nothing special. On the other hand, this is a bundle of smart technology, considering that it is also a wireless headset with a built-in touch volume control. This makes it hard to make a fair comparison. Given the capabilities of the product overall, the sound quality is decent.

I have mixed feelings about the touch controls. The ability to control volume and skip music tracks using taps and strokes is elegant, but inevitably there is more scope for mis-taps than with conventional buttons, and I found the volume control imprecise. That said, it is great to have volume and play/pause on the headphones themselves.

Conclusion

The Revo has a lot going for it. Elegant design, high quality construction, good wireless performance without any skips or stutters, and unmatched flexibility – remember, this is a headset that you can use for phone calls as well as for enjoying music.

On the negative side, the tonality is a little bass-heavy and the sound quality good but no better than it should be considering the premium price.

If the flexibility is something you can make use of, the Revo is a strong contender.

Specifications:

Driver size 40mm
Impedance 32 Ohm
Frequency response (no tolerance given) 20Hz – 20,000Hz
Sensitivity 119 dB at 1v/1kHz
Weight 240g
Battery life 12 hours playback/10 days standby
Charge time 2 hours
Wireless range 10m

 

audio

Hi-res audio and the hi-fi press: the problem with honesty

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I have posted several articles on the subject of high resolution audio – here, for example. It is a subject that fascinates me. I enjoy music more if it is accurately reproduced, and regard sound quality as something worth paying for, but is it worth investing in high resolution formats such as SACD, DVD Audio, 24/96 and higher FLAC or ALAC (Apple’s lossless audio format); or is it better to concentrate on other parts of the audio chain, on the grounds that even lowly CD and 16/44 capture music with an accuracy close to the limits of what human hearing can perceive?

Many audio enthusiasts swear that high-res formats sound much better; but solid evidence for their superiority as a delivery format is hard to come by, and when you perform simple tests like converting a high-res format into one at CD resolution and comparing the two, it is often (perhaps always) hard to hear any difference. 

High resolution formats are of course a necessity in music production, where the sound will be processed, possibly many times over, before the final master is complete.

Alan Sircom is the editor of the UK audio magazine hi-fi plus. In a frank forum discussion concerning the challenges of editing such a magazine today he makes the following remark:

For all the enmity you and yours have toward the magazine, our biggest potential loss of readers right now is coming from my stance on hi-res. I still maintain that you are paying a premium for microphone thermal noise and – at best – a more careful mastering process. I know a lot of manufacturers of DACs who (privately) agree with me… but have to continue to develop their products from 24/96 to 24/192 to 32/384 to DSD-over-USB because the audiophiles (who, let’s face it, buy our stuff) will not accept anything less. This is a sham, especially as there is a better campaign to be had (something like “brick-wall mastering is worse than brick-wall filtering”, but more pithy). However, the upshot of the excellent exposé of the hi-res game by Hi-Fi News did not cause an army of hi-res-loving audiophiles demanding more from their hi-res, it caused some of them to consider Hi-Fi News ‘hostile’ to hi-res.

If true, this is a depressing situation. The goal of home audio is to achieve the best possible sound at home within your budget, which means investing in the technology that makes the most audible difference. It is not easy to discern what that is though, which is where an independent press has a valuable role to play. According Sircom, that is difficult to do in practice, because of the constraints imposed by the economics of advertising at one end, and a readership which does not always want to hear the truth at the other.

apple, audio

RØDE Mic: High quality recording with iPhone or iPad

Interested in high resolution recording with an iOS device? It may be worth checking out the RØDE iXY which for $199 gets you a pair of cardiod capsule microphones which attach to the docking port on your iPad or iPhone (note that you will be holding your device upside down though it hardly matters).

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Using the associated app you can record at 24-bit/96Khz – good enough to allow some further processing while retaining high quality.

Suggested uses are recording concerts, broadcasting, or attaching to a camera for video with superior sound (though it might be easier to use a conventional external microphone).

Currently I travel with a separate device for recording so something like this is interesting. On the other hand, the recorder I use is small and light, the batteries last for days, and I can plug in any external microphone or use the one built-in. Still, an advantage of the RØDE iXY approach is that you get to use a lovely colour app for recording, and have one less device to keep charged up on the road.

apple, audio, cloud computing, rants

Amazon AutoRip: great service, or devaluing music?

Or possibly both. Amazon’s AutoRip service means that when you buy one of a limited, but considerable, range of CDs, you get an MP3 version in your Amazon cloud player for free. Even past purchases are automatically added, which means US customers have received emails informing them that hundreds or in some cases thousands of tracks have been added to their Amazon cloud player.

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The service adds value to CD purchases in several ways. You get instant delivery, so you can start listening to your music straight away, and when the CD comes in the post, you can enjoy the artwork and play it on your hi-fi for best quality.

Amazon is differentiating from Apple, which only sells a download.

An infernal creature lies in the details though. Here are a few comments from Steve Hoffman’s music forum:

Got Auto-rip Pink Floyd’s DSOTM 2011 mastering of the DSOTM SACD that I bought in 2003.

and

I now have autorips of cd’s I no loner own…..interesting concept.

and

I now have autorips of CDs I bought as gifts.

These customers have done nothing wrong. They bought a CD from Amazon and gave it away or sold it, but it is still in their Amazon history, so now they have the MP3s.

Another interesting point is that Amazon appears to treat all versions of the same recording as equal. This is why I have included the comment about the Pink Floyd album above. Record companies have done well over the years by persuading fans to buy the same CD again in a remastered version, sometimes with bonus tracks. The Beatles 2009 remastered CDs are a well-known example. But if customers with unremastered CDs are now getting remastered MP3s automatically, this type of sale is harder to make.

The gift issue is more serious. The terms and conditions say:

Albums purchased in orders including one or more items marked as “gifts” at purchase are not eligible for AutoRip.

and intriguingly:

If you cancel your order or return this album, our normal order cancellation and product return policies will apply regarding the physical version of this album. However, if you download any of the tracks on the MP3 version of the album from your Cloud Player library (including if you have enabled auto-download to a device and any of the tracks on the MP3 version of the album auto-download), you will be considered to have purchased the MP3 version of the album from the Amazon MP3 Store and we will charge your credit card (or other payment method) for the then-current price of the MP3 version of the album (which will be non-refundable and may be a higher price than the physical version of the album).

Someone therefore has thought about the problem, though I predict unhappy customers, if they buy a faulty CD, return it, and find they have been charged anyway thanks to an auto-download feature of which they might not understand the implications.

Note also that many CDs are purchased as gifts without being marked as gifts in Amazon’s system. The idea of marking items as gifts is that you can have gift wrapping and get an item sent to another address, but if you plan to do your own wrapping, it is not necessary.

Here is something else. Audio enthusiasts are not happy with MP3s, preferring the real and/or psychological benefits of the lossless CD format for sound quality. For many people though, the audio is indistinguishable or they do not care about the difference.

What do you do if you receive a CD in the post, having already downloaded and enjoyed the MP3 versions of the tracks? I imagine some customers will figure that they have no use for the CD and sell it.  Provided they do not return the CD to Amazon, I cannot see anything in Amazon’s terms and conditions that forbids this, though I can see ethical and possibly legal difficulties in some territories.

The consequence is that someone may lose a sale.

Subscription is the future

My view on this is simple. The only sane way to sell music today is via subscription – the Spotify or Xbox Music model. The idea of “owning” music (which was never really ownership, but rather a licence tied to physical media) is obsolete with today’s technology.

Amazon’s new initiative demonstrates how little value there is in a downloaded MP3 file – so vanishingly small, that it can give them away to past customers for nothing.

audio, gadgets, mobile, reviews

Review: Edifier MP250+ Sound to Go Plus

The problem: small mobile devices are great for portability but their built-in speakers (if they exist) are poor, thanks to their tiny size and sub-optimal enclosures. The latest tablets sound better than earlier models, but it still pays to plug in an external powered speaker.

Edifier’s Sound to Go Plus could be the answer. This wedge-shaped single-unit powered speaker system is 261mm long and 36mm high – in other works, a shade longer than a 10” iPad.

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Several things are distinctive.

First, it feels robust and high quality, thanks to its brushed aluminium shell. Second, it is not just a powered speaker, but also a USB sound device that was recognised immediately by the Mac, Windows 8 and Windows RT devices I tried.

Third, it packs in four 1.25” drive units and a 30mm x 90mm passive bass radiator for a fuller sound that you might expect from such a compact speaker.

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The unit comes with audio cable, USB cable, and a simple black bag, though you will struggle to get the cables as well as the device into the bag.

Charging is via USB and no mains adapter is supplied. Many smartphone adapters will work, or you can charge from a PC or Mac.

Operation

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The Sound to Go Plus has two modes of operation. The first is USB-based, and works by attaching the gadget to a PC or Mac and then selecting it as the default audio output device. The second is based on a standard 3.5mm jack socket. This is necessary, because most smartphones and tablets, including Apple’s iPad, do not recognise USB audio devices. Microsoft’s Surface RT is an exception, and worked fine with the Edifier and a USB cable.

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The existence of two modes does add some complexity though. Edifier has designed it so that the analogue jack input takes priority. This means that if a jack cable is connected, the USB audio connection does not work. If both are connected to the same machine, neither works.

The advantage of the USB connection is first that it sounds better, and second that the device will charge while it plays.

Volume buttons are on each end of the device, down on the left, up on the right. Once connected, you turn the device on by depressing both simultaneously. This is smart, since it is unlikely to happen by accident in your bag.

Sound quality

Sound and mobile is all about compromise. I compared the Sound to Go Plus with several alternatives, from built-in speakers on an iPad or Surface RT, to various other portable systems.

The Sound to Go Plus was a big improvement on the built-in speakers. Sound is deeper, crisper, smoother and more detailed.

Compare to a grown-up pair of powered speakers like the superb Audyssey Lower East Side, admittedly more expensive and less portable, and the Sound to Go Plus is boxy, bass-shy and constricted.

That said, the Edifier sounds miles better than a old Creative Labs Travelsound unit I tried. The Travelsound is also a one-piece design, but with only a single drive unit per channel and no passive bass radiator. The Edifier won easily.

I was less sure about the comparison with the X-Mini Kai. The Kai is a mono unit but even with only one drive unit it lost only narrowly to the Edifier. The Kai’s brighter sound made the Edifier sound slightly muffled and the bass on the Kai is also decent, though in the end the Edifier’s smoother, weightier sound won my preference. The Edifier also feels stronger and more business-like than the quirky Kai with its concertina design.

Still, a unit like this is not about the ultimate in sound quality. It is about getting acceptable sound while on the go, and in this respect the Edifier impresses. It is not squawky or annoying, build quality is good, and watching a movie or playing background music with this is more fun than using what is built into a tablet.

Volume is just about good enough, though I would have liked a little more power.

Conclusion

The Edifier Sound to Go Plus is a great little device and worth considering if you are looking for better sound while travelling.

 

apple, audio, reviews

Review: Edifier Spinnaker e30 Multimedia Speakers

Now these are smart. A pair of three-way active speakers shaped like spinnakers, with Bluetooth 2.1 support so you can use them without wires. I think wireless is the future of home audio, so high quality devices like this catch my interest. You come home, pull out your smartphone, press play and sweet music fills the living room.

The e30s have a wireless controller too, a bulbous device which gives out an other-worldly red glow from its base. Twist to set the volume, tap the top to turn on or switch input. Is this all you need?

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Here is a closer look. Each speaker stands around just over 400mm high. At the base they are about the size of a CD (remember them?), tapering to a point at the top. The speaker units are of plastic construction, mostly covered with acoustically transparent cloth, and with an aluminium protrusion at the base to give additional stability and a way of tidying the cables.

The right-hand speaker is the master, and has four connections:

  • Power in
  • Combined analogue/digital input
  • Subwoofer out
  • Connector for left-hand speaker

Internally, there are three drivers in each speaker, comprising a silk-dome tweeter, a 70mm mid-range unit, and a 116mm woofer. There appear to be six channels of amplification, one for each driver, rated at 10w RMS for the tweeter, 10w for the mid-range, and 25w for the bass, quoted per channel. Frequency response is quoted at 68Hz-20KHz +/- 3dB; good for speakers of this size, though for faithful low-frequency reproduction you will need to use that subwoofer connection.

Modes of operation

The Spinnakers are pretty flexible when it comes to connections. The analogue input is a standard 3.5mm jack which you can connect to any external player, such as a computer, an iPod, an Airport Express, or a CD player. This input doubles as an optical digital input, which I tested at 16/44 (standard CD resolution) without any issues. Alternatively you can use Bluetooth, with support for A2DP (Advanced Audio Distribution Profile), which means that most modern tablets or smartphones will be able to play audio to the speakers. No worries about dock connector types or Apple’s proprietary AirPlay wireless system.

A possible scenario then is to have the speakers permanently wired to a computer or another source such as a Squeezebox or Sonos unit. Then you can use Bluetooth for convenience, and the wired source for best quality.

An obvious position for the speakers is either side of a desktop computer, but they are good enough to sit in the living room too, particularly when boosted with a subwoofer.

Setup

After unpacking the speakers, the first task is to charge the wireless controller using the supplied USB cable. Next, connect the power, connect the speakers to each other, and optionally connect to a wired source.

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This task is more awkward than it should be, since there is limited space in the base of the speaker and you have the bend the cable back firmly in order to align each plug with its socket. Next, you have to feed the cables through channels in the base of the unit in order to stand the speaker up without it rocking.

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I found the cable tended to come away from the channels easily if you move the speaker so it is all a bit fiddly.

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Next, find the controller and turn the speakers on by holding down its central button. The controller works as follows:

  • Press and hold top button to turn on, cycle between inputs, or turn off.
  • Tap top button to mute/unmute audio
  • Rotate controller to change volume
  • Hold down button and rotate controller to skip track back or next

The current status is shown by a light at the top of the right-hand speaker, which shows off for off, blue for Bluetooth, green for analogue wired input, and red for optical digital input.

Bluetooth pairing is rather simple. Switch to the Bluetooth input, then search for a Bluetooth device on the unit you want to connect. Select the Edifier and you are done. To connect a different device, repeat.

Sound quality

The sound is impressive, especially if you listen in the sweet spot in the centre with the speakers in front of you. The quality is rich and refined, especially with a wired connection, but also enjoyable via Bluetooth. They also go loud, not enough for parties or to annoy the neighbours perhaps, but plenty loud enough for most listening. To put some numbers on that, I measured over 85 dB without any obvious distortion. Bass is a little lightweight, but not so much as to spoil enjoyment.

I tried attaching a subwoofer which rounded out the sound nicely. The subwoofer output covers the range 20Hz – 100Hz and is pre-filtered. One note of caution is that the the output socket has a narrow entrance and I had to try a couple of different cables before finding one that fitted properly; the ill-fitting cable rewarded me with a horrible noise.

If I put on an audiophile hat I can find fault with the sound. It is slightly sibilant, especially via Bluetooth. There is some smearing of detail compared to a high-end system, and a slight boxiness to the sound. Vocals are not quite as natural. But here I am comparing to a system that is many times the size and price. In context, the e30’s sound fine and I doubt any purchaser will be unhappy with the sound.

Annoyances

There are a few issues with the Spinnakers. The worst flaw is the way the cabling is handled, awkward to fit, and tricky to press firmly enough into the holders to prevent a slight rockiness in the right-hand speaker which cannot be good for the sound.

Next, I don’t much like the way the status light works. It is not that easy to see from a distance. A status light on the controller rather than on the speaker would be welcome.

Another factor, not an annoyance exactly, is that the speakers are on the large side for a desktop – and the manual recommends having them 1 meter away from a monitor or TV set – but they are on the small side when placed on the floor.

Conclusion

Despite a few nits, I like these speakers for their stylish appearance, high sound quality, and flexible connections. The price may seem high, but bear in mind that you are getting amplification as well as loudspeakers, and sound that is well beyond most powered speakers. Set these up on a table, place a tablet in between, and you have a rich audio and video experience. I also like the idea of using these for a living room system, if they suit your decor.

A subwoofer is not essential but takes the sound to another level, provided of course that the sub is of equal or better quality than the Spinnakers.

Recommended.

 

audio, mobile, reviews

Review: Philips Voice Tracer digital recorder DVT 3500

I am someone who records interviews and events frequently, so have a keen interest in digital recorders. Earlier this year I started using a Philips Voice Tracer, reviewed here, so was interested to take a look at a new model, the DVT 3500.

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It is the same kind of thing: a handheld recorder with a built-in microphone on the end and a small speaker so you can listen on the device itself if you have to, though you will get better quality from headphones.

Like my other Voice Tracer, this one feels a bit flimsy, but benefits from being small and lightweight, and the older one has proved perfectly durable.

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You get quite a few bits in the box: digital recorder with 2GB storage, rechargeable batteries, short USB cable (now micro USB), a standard set of earbuds, a cheap and not very cheerful pouch, and as a special bonus, a telephone pickup.

2GB is on the small side in my opinion, but there is a microSD card slot so you can easily expand it.

Here are some of the things i like about the DVT 3500:

  • Rechargeable batteries which are nevertheless standard AAA size so you can use standard batteries if necessary. Long battery life too, something like 40 hours recording from a full charge. I never worry about it.
  • Built-in stereo microphone and socket for external microphone so you have the choice.
  • Built-in speaker so you can playback without headphones if necessary; of course the sound is tinny.
  • MicroSD slot mitigates the somewhat small 2GB internal storage – though even 2GB is plenty for many hours of recordings, the amount depending on the format you choose.
  • Decent choice of formats from 8kbps MP3 to lossless WAV. I prefer the 192kbps MP3 which Philips calls “Super high quality”; note that this is not the default. WAV is silly unless you have a high quality external microphone and are recording music.
  • Little fold-out stand for raising the microphone when placed on a table.

The supplied telephone pickup works like this. It is a mono earbud/microphone which you plug into the microphone socket and stick in your ear. Hold the phone to your ear, and if you can hear the other person, then so can the microphone. I tried it and it is effective, but somewhat intrusive since you get a lower quality of call than you would get without it.

The ear buds on the other hand are remarkably good, clear and with surprisingly deep bass. They are fine for music as well as playing back interviews for transcription.

I compared it to my older model. Quality of recording is similar, though the built-in microphone on the DVT 3500 seems a bit better than the older one. Storage capacity is less but my old model lacks a card slot. The new model has an LED which glows red when recording, and flashing red when paused, a nice feature. Another neat touch is pre-recording mode, where it records a five-second loop in standby mode so that when you hit record, you get the previous five seconds as well.

What is most noticeable is that Philips has worked hard on the firmware, which is much improved. I would not call the DVT 3500 a pleasure to operate, but it is much less fiddly than before. A great feature is that when you scroll though recordings, it auto-plays the first few seconds of each, making it easy to find the right one.

In the old user interface, you use the central joypad to page through incomprehensible icons. The new interface has just four icons along the top, representing File, Record settings, Display settings, and Device settings.

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Select a menu with the joypad, and then navigate up and down the sub-menu. The new higher resolution screen allows the choices to be spelt out clearly, such as Format memory in place of the old FORM.

The settings are rather extensive, to the point of confusion. There are separate settings for Auto Adjust Rec, Mic sensitivity, Wind Filter, and noise reduction; I think I understand what all these do, but trying all the combinations to find the optimal results would take time.

If you are recording music I suggest turning off all the automatic adjustments and filters, but for voice where all I care about is a clearly intelligible recording, I leave it on auto adjust and it seems to work out fine.

Make sure you find the real manual, which is a PDF on the device or on the Philips web site. The printed getting started leaflet is short and confusing.

Note there is no radio in this model. It is mentioned in the manual, but that is because the manual covers several models which have different features. This bother me not at all.

When you connect to a PC or Mac the device shows as external storage and it is trivial to import the audio files. The supplied USB cable is irritatingly short though.

The only thing to add is that I personally prefer an external microphone. I did some test recordings, and found that you get much better quality when holding the device in your hand close to your mouth, as opposed on the table in front of you, but that is impractical in many scenarios like interviews. Another snag with the internal microphone is that you get inevitable slight noise when operating the controls.

My old model came with a tie clip mic as well, which I use all the time, sometimes as a tie clip mic, and sometimes just placed on the table. Be careful though If you use a mic other than an official accessory; I tried a Sony mic but its output was too low and the recordings far too noisy. Try to test before purchase.

An excellent device though, which does the job for which it is designed very nicely indeed.