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REVIEW: Audio-GD Phoenix Balanced Solid-State Headphone Amplifier

post #1 of 156
Thread Starter 
Lots of ink has been spilled about this amp already. The “big thread” on the Audio-GD Phoenix is VERY long – so long it’s only useful as a running dialog about the amp – reading through it to glean information has become very difficult. But it shows that there is a lot of continued interest and excitement for this amp, which is in my experience somewhat unusual for an amp that sells for more than $1,000. So I was very excited myself to get the chance to listen to it.

One thing I DID glean from the big thread, however, was that a review of the Phoenix without a pair of balanced headphones would be less than useful, since it is a fully balanced design, and that this is a big part of what makes it what it is. As luck would have it, a pair of 600 ohm Beyerdynamic DT880’s that had been recabled for balanced popped up in the FS forums about the time the Phoenix arrived. This was almost too good to be true, since I am thoroughly familiar with the DT880 (as well as being a big fan), and I would be able to compare the same exact headphone balanced and unbalanced. SO I bought the balanced 880/600’s, and all was well. I already had a balanced DAC (the Music Hall dac25.2, which when used balanced bypasses the tubed output stage). So my review of the Phoenix is primarily using that configuration – Denon CDRW1500 > toslink > dac25.2 balanced > Phoenix > DT880/600 balanced.

When the Phoenix arrived, I was taken aback at how heavy it was. This is one SERIOUSLY built amp. It’s also cosmetically beautiful – if you are into audio gear as jewelry, the Phoenix will tickle your fancy in this regard, I’d wager:

I was further taken aback at how HOT the Phoenix is. I guess it’s biased HIGH into Class A, because this thing is very hot, even at idle. I had to put my DAC up on some very tall isolation feet so there was enough air circulation above the Phoenix. There are 2 chassis, and it’s better to put the “control” chassis above the chassis with the headphone connectors from a heat management perspective. The Phoenix’s chassis gets warmer than the chassis of any tube amp I own. No kidding.

I broke the amp in for 300 hours before reviewing, and with the 150 the factory puts on, that’s 450 hours. Should be plenty, and I did not notice any change in sound during the time I did my auditioning. The only operational “quirk” of any kind I had is some very slight clicking when using the volume control, as other users reported. But it was very slight. And when using the remote control, there is no clicking when changing volume. Otherwise, the Phoenix performed flawlessly.


The Phoenix is, without a doubt, one of the smoothest sounding solid state amplifiers I have ever heard. It has an effortless, delicate, nuanced delivery that will melt the heart of even the most die-hard tube-loving headphile. The overall presentation is just slightly dark. I can see why HD800 owners like the Phoenix – the very slightly laid-back treble would no doubt mate well with the HD800’s treble presence. Same with the DT880 – there is no question that the Phoenix delivered the best sound out of the DT880 that I have ever gotten from a solid state amp, and indeed with the balanced DT880, the best sound I have ever heard from any DT880, period. The balanced DT880/600 and the Phoenix provide a level of performance that is hard to imagine unless you hear it. It’s wickedly good. You could listen to it for hours and hours with no fatigue, and with a deep sense of engagement.

For example, during Joan Osborne’s aching cover of “I’ll Be Around”, I noticed at one point while typing the sentence above that I wasn’t typing anymore. I got lost in her voice. I mean totally lost. This doesn’t happen to me nearly as often as I wish it did. But the Phoenix was able to deliver goose-bump thrills on a more than just occasional basis.

Part of the magic is the absolutely spooky dark black background that the Phoenix produces. This aides in both dynamics (which are very good but not the absolute best I have heard), and in transparency. The Phoenix is definitely highly transparent sounding – it is completely free from any sort of veil or haze or glaze – it provides a pure, wide open sound that serves all kinds of music very well.

The midrange is very full and rich, but in no way syrupy or fat. But it is less thin than many other SS amps, even in the $1K+ price class. I don’t have any of the other high-end SS amps I have reviewed around for reference any more, unfortunately, but I have reviewed or owned the B22, RSA Apache, Blue Circle SBH, ALO/RWA Amphora, Meier Opera – all some nice SS amps. And at least from memory, I would take the Phoenix’s midrange performance over all of these. Joyc e Cooling’s fragile first-alto vocals on “This Girl’s Got to Play” were sumptuous, as were Mae Moore’s on “Love Will Bring You Back”. Female vocals are absolutely wonderful on the Phoenix. Guitars had nice crunch and tone without sounding overly forced.

Bass performance was interesting. Extremely tight and deep, and well defined, and very articulate. There was just a very little bit less punch than I expected, I guess, but I didn’t consider this a deficiency – the bass was very well integrated with the overall sound, and while I have heard amps with just a bit more bass weight, the Phoenix’s overall smooth nature meant that this did not yield any brightness in the overall sound. Far, far from it, in fact. The Phoenix is unfailingly smooth and rich sounding, without sounding in any way slow or lacking in detail. Listening to “Inhaler” from Hooverphonic’s “A New Stereophonic Sound Spectacular” showed the Phoenix to deliver very musical bass of exceptional control, but with just a bit less weight at the bottom than I get from other top tier amps. But again, this is very slight.

Higher up, things are also really, really good. Treble detail is better than some amps that sound brighter. The treble is so smooth and pure that it doesn’t call attention to itself (which is a good thing), but small details still come through. For example, there are some triangle strikes in part of “Inhaler” that come though very nicely in spite of that song’s waterfall of instrumentation. Ditto some triangle strikes in Mastodon’s “The Last Baron” from their new “Crack the Skye” (which was outstanding via the Phoenix). If all SS amps had treble like the Phoenix, the world would be a far happier place, IMO. The ability to be simultaneously so detailed and so smooth is a big part of what makes the sound of the Phoenix fly, IMO.

Imaging is exceptionally well defined, and this is sometimes a hard trick to pull off in an amplifier with as smooth a treble as the Phoenix. Many people confuse image specificity with an exaggerated treble which pushes detail in your face. The Phoenix does no such thing – it is a very natural soundstage, with outstanding image stability and definition, with a great sense of space created. It does seem to be a little less “out in front” of the head than some of my better tube amps, but it is nonetheless very, very good. Width of the soundstage is also excellent. One would hope that an amplifier in this price class would contribute to excellent soundstaging (which of course is dictated largely the headphones), and indeed, the Phoenix does very well here.

I will say that the Phoenix did work a little better for some headphones than others. All of my 600 ohm Beyers sounded nothing short of wonderful, even single-ended. This is a Beyer-lover’s amp, for sure. I can’t wait to hear with with the new Beyer T1 when my pair arrives. But the Beyers were a better fit with the Phoenix than the JVC DX1000’s were. While I thought the DX1000’s sounded excellent via the Phoenix in many respects, the slightly dark sound of the DX1000 paired with the slightly dark sound of the Phoenix was a little TOO dark when used in combination. Not so much that it renders the combination unenjoyable – quite to the contrary, I still enjoyed it. But if the DX1000 were my only headphone, I wouldn’t choose the Phoenix. Similarly, if the Phoenix were my only amp, I wouldn’t choose the DX1000. The DX1000 sounded a little better on my Decware CSP-2 and my Darkvoice 337 than I felt they did on the Phoenix (both of those of amps were about the same price as the Phoenix, when the price of the tubes in them is factored in). I wish I still had my Denon D5000’s – I bet they would sound great with the Phoenix if my memory of them serves me. I also don’t have AKG K340’s anymore, but I bet a balanced pair of those would be dynamite on the Phoenix.

A word about balanced versus SE performance – since I had both balanced and unbalanced DT880/600’s, some easy comparison was possible. I would say that the sound in balanced was 15-20% better than SE – much higher than I expected. The soundstaging was better; the overall sound was more nuanced and delicate; decay and hall acoustics were easier to hear. I would highly encourage owners of balanced headphones to find a way to audition them with the Phoenix. I also think that spending $1,200 for this amp if you don’t own a pair of balanced headphones, or plan to buy some soon, probably isn’t the way to go. It’s still a great amp, but you’d be paying a big premium for a benefit that you couldn’t use.


The Phoenix is a world-class solid state headphone amplifier that truly shines when used with balanced headphones, but is still very good running SE. When driving a pair of balanced DT880’s the sound was so enjoyable it was hard for me to do anything BUT enjoy it. I had always kind of poo-poo’d the whole balanced thing for headphones, even though my speaker-rig preamp and power amp are balanced. Shame on me. Now I get it. While the combination of balanced 880/600’s and the Phoenix push the $2K mark, the price is fully justified by the performance, IMO. In fact you can easily spend more and get less. The Phoenix is just a touch on the dark side, so it’s a good idea to consider the pairing headphone a little carefully. But having done so, the Phoenix is a magical bird, indeed. Based on my prior experience with SS amps in this price class, and I have owned or reviewed more than a half dozen, I believe the Phoenix is also an excellent value, even at $1,200. Super-enthusiastically recommended.
post #2 of 156
Thanks for a nice review, Skylab. I wish I had your capability at writing the review. You almost make it sound much better than what I already am used to. :-) It's a great amp for sure even with those small issues (hot temperature, volume clicking)
post #3 of 156
So do you remember enough about the B22 to give me any good comparisons. Thanks Skylab
post #4 of 156
Thread Starter 
Originally Posted by DoYouRight View Post
So do you remember enough about the B22 to give me any good comparisons. Thanks Skylab
Unfortunately, not really. I was super-impressed by the B22 as well, and it wasn't all that different from the Phoenix in terms of its sonic attributes. But I really cannot provide a meaningful direct comparison. I can only do that when I have both amps, side-by-side, and can do level-matched direct comparisons.
post #5 of 156
Good review! Spent sometime to read. I keep wonder what to describe to my friend. Now I know That's the slight dark that you've mentioned. I love to listen guitar music with Phoenix. The Guitar sounds superb to me.
post #6 of 156
Wow what an excellent review. Will be in Beijing at December. Surely will give it a try !
Thanks again Skylab!
post #7 of 156
I am so glad I have no money to get into balance, that way nice gear like this does not pull me! Nice review Rob.
post #8 of 156
Nice write up Rob, as always. Just a small quirk though:

In fact you can easily spend more are get less
I think you mistyped 'and' with 'are'. Thanks for the review BTW....
post #9 of 156
Thread Starter 
Originally Posted by vkvedam View Post
Nice write up Rob, as always. Just a small quirk though:

I think you mistyped 'and' with 'are'. Thanks for the review BTW....
D'OH! Corrected, thanks
post #10 of 156
Nicely written, I am waiting patiently on mine but something happened with EMS and it was shipped back to Beijing. I am thinking it's a good old Chicago postal snafu. Kingwa is looking into it. I should have stuck with DHL I guess.
post #11 of 156
How big a step is it over the C-2C in your opinion?
I think there are some out there who might want to upgrade as I did. Kingwa has stated to me that the sound signature is similar but the Phoenix more refined across the board.
post #12 of 156
Thread Starter 
I think it's a pretty big step up. More nuance, more purity, more transparent, etc. etc.
post #13 of 156
If I had to use one word to describe the Phoenix, it would be SMOOTH.
post #14 of 156
Thread Starter 
Originally Posted by moonboy403 View Post
If I had to use one word to describe the Phoenix, it would be SMOOTH.
Indeed!!!! Like Buttah
post #15 of 156
It's pretty darn transparent also, not only smooth. Pair up with CAST or ACSS (lol), then you can extract another 10%+ or so SQ from it.
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