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Audio-OPUS #1 High Resolution Portable Audio Player – Review

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Audio-OPUS #1 High Resolution Portable Audio Player – Review

Intro

Korean tech company ‘thebit’ (The Best Internet Technology) has started high in its naming of the OPUS#1 player, making us think of sublime classical compositions and other arty treats; but does the OPUS#1 hit the right notes?

 

Opus #1 hi res player - hifiheadphones

Design and appearance

The OPUS#1 has a slightly angular and bevelled look which is reminiscent of Astell&Kern’s recent efforts, but with a slightly softened feel in comparison. It’s a pattern which is reflected in the sound of the player when compared to A&K but more on that later. The touchscreen is very responsive and easy to operate, with a good choice of navigation methods available with the player software. We can navigate by song, album, artist, genre, favorites and also by folder, which should keep everyone happy.

With a firmware update (1.10.15 at this time) the player remembers the track which was last listened to, if the track was paused and the player allowed to enter ‘hibernation mode’. Upon reawakening the player, the music resumes from where it was paused.

The OPUS 1 case is made using enhanced ABS and tempered glass, similar to many of the newer Smartphone’s on the market, the tempered glass covers almost all of the front and back of the player, giving the player OPUS#1 a premium feel, while the ABS shell reduces the overall weight of the player.

 

Key Features

Slots for two MicroSD cards (currently up to a capacity of 200Gb each) together with the on-board storage of 32Gb make the Opus#1 a heavyweight in terms of capacity, and the clear screen and intuitive navigation make it a breeze to find what we wish to listen to.

The sound can be moulded to the tastes of the user by way of the EQ feature in the player; there are three user EQ settings which can be stored, there is a delay of 3 or 4 seconds between selecting EQ settings and hearing any changes come through in the sound, why I am not sure, but in a strange way it gives you a chance to here how the EQ has changed the sound, but it is an unusual delay that may frustrate you for a few seconds.

The Opus#1 can handle all popular formats up to 24bit/192KHz and also DSD so we can take advantage of all that storage capacity with high quality files! Also the optical output can feed audio data to an external DAC for use with a full-size hi-fi system or a dedicated headphone amp, although the Opus#1 does sound pretty spectacular already.

 


Durability & build quality

The case as mentioned made of high quality tough ABS  and the player certainly feels substantial and solid, but without feeling too heavy or bulky. That is partly due to the front and back being tempered glass (the front being the touchscreen, obviously!).

Buttons are present on the sides and are easy to operate with a good feel; they also function when the screen is inactive but shouldn’t cause any trouble with the player being used whilst in a pocket or bag. Use of the leather case reduces any chance of unwanted button presses, but it is rather tight,and once on, hard to get off again!

Sound Quality

Some players have an ultra-accurate sound with which there is a danger of getting too cold and clinical, and others give an overly warm sound which can be further accentuated by choice of headphones. The Opus#1 does very well at occupying the middle ground, giving a very clear presentation which is also very musical. Most headphones an earphones will likely respond well to this, making the Opus#1 a good choice for those who already own decent quality headphones and seek to get the best from them.


Pros:

Good solid build,
Sound quality clear and well balanced,
Good amount of power for portable headphones,
Full navigation options,
Leather case is a nice extra but hard to remove

Cons:

EQ effect is delayed

Summary

For a first attempt, the Opus#1 is an amazing effort and promises to be very competitive amongst offerings of much more established companies like Astell and Kern. There’s more to come from makers ‘thebit’ and we are looking forward to future products too!

 

OPUS#1 specifications.

24bit / 192kHz High Resolution Sound

32bit processor core

Cirrus Logic CS4398 x 2EA Dual DAC

ARM Cortex-A9 1.4GHz, Quad-Core CPU DDR3 1GB

SNR 115dB, THD+N 0.0007%, Crosstalk – 130dB, Output 2Vmrs

Low-clock-jitter sensitivity: 50ps(Typ)

4inch TFT Wide Touch Display (480 x 800)

WAV, FLAC, ALAC, AIFF, DSD, WMA,

MP3, OGG, APE(Normal, High, Fast)

Internal Memory 32GB

External Micro SD Card Memory 200GB x 2EA

Enhanced ABS Solid Body and Tempered Glass

Audio Performance

DAC
CS4398 * 2EA(Dual DAC)

Decoding
Support up to 24bit / 192KHz Bit to Bit Decoding

Frequency Response
±0.02dB(Condition: 20Hz~20KHz) Unbalanced & Balanced
±0.3dB(Condition: 10Hz~70KHz) Unbalanced & Balanced

Signal to Noise Ratio
114dB @ 1KHz, Unbalanced
115dB @ 1KHz, Balanced

Crosstalk
130dB @ 1KHz,Unbalanced / 135dB @ 1KHz, Balanced

THD+N
0.0007% @ 1KHz

Output Impedance
Balanced out 2.5mm(1ohm) / PHONES 3.5mm(2ohm)

Ouput Level
Unbalanced 2.1Vrms / Balanced 2.3Vrms(Condition No Load)

 

Acoustic Research M2 High Resolution Audio Player – Expert Review

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Acoustic Research M2 Review – Android on Steroids

Acoustic Research is one of those old names which has been connected with the world of hi-fi for some 63 years now, although it has changed hands a few times since. Responsible for quite a few innovations over the years, can this brand offer anything new to music fans in 2015? Fully equipped with Wi-Fi capability, the AR-M2 can work with streaming services such as Spotify; so now we’re not limited to the tracks we have stored on our players.

Design and appearance

The M2 is a relatively large and weighty player, with the front side almost completely composed of glass; a fair amount of which is the touchscreen (62mm x 110mm to be exact). The back of the player is bevelled and it settles in the hand well. Its angular form and dark glass screen is reminiscent of a 1980s coffee table, but only a little one.

Key Features

Given the M2 is an android-based player, there’s a fair amount of customisation possible – there’s no bloatware or anything to get in the way, but users can always add items they wish to use. Spotify was installed without a problem, for instance.

Other than the touchscreen, there are 4 buttons on the side for track control and power on/off and a volume wheel on the top. Outputs are limited to headphones and line-level output. There’s a little sliding door for micro SD cards if the internal 64Gb isn’t enough for your music collection, and of course a slot at the bottom for connecting to a computer via USB.

The player can be ‘locked’ for when it’s playing whilst in a pocket or bag; however the buttons on the side still function so there may be some issues there. The volume control wheel on the top is still sensitive when the M2 is locked so again, care is needed.

The player was taken outside on one of the brightest days we have in the UK (we do get bright days) and with the settings adjusted for maximum screen brightness, the screen was clearly legible. The only problem is the fingerprints on the vast expanse of screen which are also clear to see.

The Dac within, a Burr-Brown PCM1794A offers up to 24-bit/192kHz playback and supported formats include DSD, WAV, AIFF, FLAC and ALAC.

Being Android-based, streaming services such as Spotify can be installed on the AR-M2 for use over local wifi networks, making this player more useful still.

Durability & build quality

As alluded to above, the M2 is solidly built and gives the impression of something which will last for a good few years. The back does have a hollow ring to it when tapped with a fingernail, but it doesn’t feel hollow or flex with pressure.

The M2 will be fine in a trouser pocket, but tight trousers might not react too well. Bend over and you might gore yourself – the design is strong and unyielding! The M2 comes with a velvety pouch for protection – ostensibly for the player itself, but it might help avoid the odd nick or scratch elsewhere too.

The buttons on the side of the unit for play controls can be operated even when the unit has gone into standby/hold mode, so fishing the AR-M2 out of a pocket may cause an unintended change of track. Also, the volume control can be operated while in this state. Although it’s firm, it’s loose enough to be operated by material brushing against it in the tight confines of a pocket or bag.

Sound Quality

There’s no question about the power available within the AR-M2; with a HiFiMAN HE-6 attached, volume gets up to a respectable level – even a little too loud for sustained listening, depending on the genre. Likewise with the Audeze LCD-3.

With IEMs such as the Dita Answer (Truth Edition), the AR-M2 is in its element with well controlled bass, excellent space and detail in the midrange, and a rich airiness which brings the best out of both the music and the earphones.

Within the supplied AR player app, EQ settings are possible with many genre-based presets but there’s a limit to the control possible with the rudimentary 5 band on there. This can always change with future updates, however the unadulterated sound of the AR-M2 is perfect.


Pros:

Fast, responsive touchscreen
Large internal memory
Can run apps such as Spotify

Cons:

Side buttons can be pressed while unit is on ‘hold’
Volume control can be accidentally operated

Summary

The Acoustic Research M2 (or AR-M2) is a fantastic sounding player which is well worthy of a position at its price point. Holding it gives the impression that it’s a serious bit of kit, despite all the fun it gives. It has enough power to drive all commonly used headphones well; even 600 ohm cans with sensitivity below 90dB. The large internal memory and the adaptability offered by the Android-based operating system make this a very nice pocketful, although a large one. It’s definitely one for a jacket pocket or bag.

Please take a look at our video review below for more details.

 

 

Astell&Kern AK240 – Expert Review

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Astell&Kern AK240 – Expert Review

Pros

  • Fashionable touchscreen operation
  • Very solid build quality
  • Large 256Gb internal memory
  • Audiophile grade sound
  • Very connectable
  • Charges by USB
  • Supplied with high quality leather case

Cons

  • Angular design looks better than it feels
  • Current maximum MicroSD accepted is 128Gb
  • Touchscreen response slower than smartphone equivalent
  • Player feels vulnerable if worn in pocket
  • Volume control feels a bit flimsy
  • Power up a bit slow

Verdict

A uniquely designed high-resolution player that is generally well made. Sound quality is is up there with the best digital audio players available and has plenty of connectivity options. Some may find the touchscreen a little old fashioned with a relatively slow response time.

Intro

Astell&Kern needs no introduction as a leading brand of high end portable players, and many fans of top-notch sound quality hold the players they produce in high esteem. So their flagship model, the AK240, has its work cut out!

Key Features

The AK240’s touchscreen encompasses a lot of possibilities and intuitive control features; for example it’s very simple to fast forward through a long track as the position marker can be dragged as fast as the user’s finger is moved. Also, changing volume can be done on the screen; but beware if you have sensitive IEM’s! Luckily there’s a dedicated volume control for those without steady hands.

Connectability is there in spades; the AK240 has a bluetooth capability so suitable wireless headphones can be used with it, any compromise with sound quality will have to be weighed up with the convenience that bluetooth headphones provide. Also Wi-Fi is featured so music can be sent streaming around the house, and files/folders can be read from and added wirelessly.

Also, the AK240 has an optical output which allows the user to send music data to an external DAC if preferred, and a balanced output for those who will accept no compromise where sound quality is concerned.

 

First Impressions

The Astell&Kern AK240 player looks like a piece of modern architecture at first glance; the screen is partly framed by two very angular bevelled edges which act like an optical illusion of some kind. This does lead to some problems gripping the AK240; care is needed when picking the player up off a flat surface as the right-hand side is relatively thin. The AK240 is supplied along with a high quality leather case, which will go some way to improving this.

Once safely in one hand, the user will likely need the other hand to operate the AK240 as the touchscreen control demands accurate direction by an attentive finger, also the touchscreen requires the user to see what is displayed in order to operate the unit. Volume can be altered by the dedicated control on the right side; this does feel a bit flimsy but offers no trouble during operation.

Once a track is playing, the cover art (if available) is displayed along with the usual artist/track information making a pleasing visual display, until of course the auto-hold feature renders the screen blank. A quick press of the power button brings the display and control capabilities back of course, and this feature can be configured as the user sees fit.

The AK240 does take a couple of minutes to read the contents of a freshly inserted Micro SD card before continuing, so if you’re chopping and changing with multiple cards don’t expect to be listening to your music immediately.

For the asking price, there are going to be some very demanding end-users with some very exacting requirements. We’re happy to say that the AK240 addresses these with aplomb. Any drawbacks mentioned are relatively minor and we mention these as we understand the stringent expectations prospective users may have at this high-end level and price point.

It would have been preferable to have a player which feels as good as it looks. Certainly the AK240 is visually striking but beauty is only skin deep. The attractive sheen may wear thin as the player is used on a day-to-day basis, due to the way it feels in the hand; there is an unyielding quality about it which may alienate some after a while.

Sound Quality

The Audiofly AF180 was used for the listening test, along with a Beyerdynamic T1 to test for available power.

Needless to say, the sound quality is stunning. But in order to gain a bit of perspective we put the AK240 up against a similar high-end player, the Lotoo PAW Gold. The general concensus is that the Astell&Kern AK240 reaches a bit lower and provides a little more ‘rumble’ in the bass department, while the Lotoo PAW Gold has a bit more up top making the tape hiss on Queen’s ‘Another One Bites The Dust’ a bit more apparent.

The feeling was that the AK240 gives a little more atmosphere and space; it’s a very natural and effortless sound. Acoustic and classical tracks are very immersive, with separation which is second to none in terms of portable players. Things seem a little more reined in and controlled when dealing with dynamically compressed pop music. These differences are very subtle of course, and are only mentioned to give the reader a more meaningful explanation of the player’s capabilities rather than those of the headphones used.

Power is plentiful too – the Beyerdynamic T1 was driven very well, the only time more headroom was required was with quieter classical passages with of course no dynamic compression applied within the production.

 

Summary

In terms of sound and functionality, it may come as no surprise that this is perhaps the best player available. The connectivity and versatility really make the Astell&Kern AK240 special; however not everybody likes a touchscreen and this may dampen the enthusiasm of some. Operating the unit may require it to be drawn out of the pocket, and any accidental swipes may lead to some frustrating moments.
Score 9.0

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Lotoo PAW Gold Player – Expert Review

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Lotoo PAW Gold Player Review – Reference Level Audio Player

Pros

  • Quick response to button pushes
  • Solid, sturdy build
  • Navigation simple and quick
  • Huge card capacity
  • Fast power up
  • Recessed yet accessible volume control
  • Great value for money

Cons

  • Golden volume and navigation controls may be on the blingy side for some
  • No digital outputs
  • Charges via mains adapter/wall wart only – not USB
  • Screen seems small amongst those of other DAPs

Verdict

A very capable and well-built unit, the Lotoo PAW Gold Player looks and feels as good as it sounds. The array of buttons make navigation a breeze and they’re all easy to get to. The unit feels right at home in the palm of the hand, and is easy to operate – even in the pocket once the control layout is familiar. It scored a hit with everyone here who tried it, and together with its future-proof SD card capabilities it looks like it is going to be some tough competition for other high end portables out there.

Intro

Joining the ranks of companies entering the portable audio fray with a high-end audio player is a company called Lotoo (pronounced low-to) with the PAW Gold. With audio quality that matches the Astell&Kern AK240 player and a price which is a whole lot lower, you may not need to win the lotto to enjoy this player!

Key Features

The most striking thing about the PAW Gold other than the large golden Mayan-style control on the front is the obvious button-focused control method which is a contrast to the AK240’s touchscreen. And it’s horses for courses; many people love gadgets with touchscreen operation and many people prefer buttons, these offer instant feedback as the user knows that a button has been pushed, and instant access to menus such as the player’s start screen or EQ settings is certainly a bonus.

Lotoo have gone for simplicity in terms of outputs and connectivity; the PAW Gold offers both a headphone output and a 3.5mm line-out. Sound quality is described below, but it’s unlikely that any external DAC is required to be used with the PAW Gold, also this DAP packs a real punch in terms of power so external amping is unlikely to be needed if the user is on the move. Line-out is a nice extra though if connecting to full-size amp and loudspeaker system.

The PAW Gold can accept some giant capacity cards – it’s designed to work with SD cards, but can of course be used with Micro SD cards by means of an adapter. So up-to-date is the Lotoo PAW Gold, the maximum capacity card does not yet exist! This may be a window into the future as the maker has seen fit to add compatibility for 2TB (2 Terabyte) SD cards. The largest sized SD Card available as of this time is 512Gb, so there’s a clue!

The volume control is accessible but nicely recessed at the same time. No need to be nervous when donning sensitive IEMs for example. It has a nice feel to it, neither too stiff nor too loose.

 

First Impressions

The size of the PAW Gold is noticeable when we’re used to ultra-skinny items such as modern phones and media players, but it feels like a solid piece of kit, much like something from the realm of professional audio. Not surprising, as the maker is well known for manufacturing innards for other brands’ high quality audio gadgets.

It feels great in the hand (left or right) and all buttons are easy to reach with the thumb. The screen is comparatively small but this is designed to be listened to after all. On-screen information consists of file audio quality details and track/artist details, with a large stereo level meter.

A moment of confusion was when the ‘key lock’ switch had been operated; this was not immediately obvious to me when I tried to operate the unit. The display showed the ‘power down’ screen leading me to think the battery was low, but a colleague pointed out that the key lock feature had been enabled. Perhaps a future firmware update might address this.

Sound Quality

As may be expected for a player at this price point, sound quality is top notch and can only be compared to similar bits of kit to give any meaningful impression, such as the Astell&Kern AK240. The PAW Gold resolves very well, perhaps a tiny bit better than the AK240, but the AK240 gives a better sense of atmosphere. Much like the difference between valve and solid state amps, although much more subtle.

The audio was tried with the in-ear Audiofly AF180, as well as with full-size headphones such as the Beyerdynamic T1. The PAW Gold gave a vibrant and immersive presentation, and with genres such as classical music, a wonderful richness. Timbre/harmonics are brought out and separation is very realistic with an excellent soundstage.

The amp was certainly put to the test; as well as the Audiofly AF180 IEMs which were used for the critical listening tests, a pair of power-hungry Beyerdynamic T1s were plugged in. The PAW Gold has 2 levels of gain and on the louder setting the T1 was powered very nicely. Only during the quieter parts of dynamically uncompressed classical tracks was any extra headroom called for; it’s safe to say that for any headphones under 600 ohms and with sensitivity equal to or greater than the T1’s 102dB this will not be an issue.

Summary

With portable players, many factors come in to play as the unit is picked up, put down and carried around many times per day; the sound is as important as what the unit is to live with and operate on a day-to-day basis. The PAW Gold certainly passes both tests as, despite its solid chunkiness, it becomes like an old friend very quickly. Once the button layout becomes familiar, the unit can be operated (such as track skip) in the pocket without needing to take it out, and the unit just feels good in the hand.
Score 9.5

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