wsz0304
Member of the Trade: Shenzen Audio
- Joined
- Jul 1, 2008
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if you look for it on ebay,you can find it.
You have to understand that there are no losers here. The nice thing about current driven amps is that they appear to be tolerant with most if not all headphones, regardless of impedance. Impedance matching does not seem to be all that essential, very likely because the output signal current drives the heaphones ("push"), rather than the output voltage inducing the signal current through all the system impedances ("pull"), implying impedance matching is more critical. Or so it once made sense to me...
Comparing the CMA800 and HPA-21 amps, using the same DAC and source material, the CMA800 seems to be somwhat brighter, more airy, with the HPA-21 darker/warmer. The HPA-21 seems to have more body and texture in the mids and middle bass regions. However, the CMA800 appears to have slightly more bass extension, however thinner. Weird that. And the CMA800 seems to actually have less distortion than the HPA-21; the notes and vocals are crisper, more articulate. The HPA-21 also seems to run a bit hotter, for what that's worth (Class A?).
Having said all that, there seems to be a special synergy with the CMA800 and my LCD-2s. I believe this extraordinary match is because of pairing a brightish amp with darker headphones. Remember, we're talking nuances here, not glaring attributes. But it's a very good resulting tonal meld which is quite pleasing to the ear. Of the two amp pairings with the LCD-2, I feel the CMA800 combo is more euphonic, at least to me.
However, I think that the HPA-21, because of producing fuller audio in the mids and mid bass frequencies, does offer the advantage of better approximating the euphonic tube sound of lots of mids bloom. If you relish more the warm lush sound of tube amps, then the HPA-21 ascends over the CMA800.
I think that the CMA800 offers exceptional SQ value at whatever price point it's finally introduced at in the US. I anticipate a US distributor to be in place and product exhibition by RMAF 2014. Meanwhile, you can most likely purchase one factory direct by contacting Questyle (Alden Zhao) and inquiring. Payment will need to be via bank wire transfer.
@project86
I used to own a Violectric HPA-V181 which I sold because my heavily modded Little Dot MKIVse sounded marginally better with my LCD-2s. Even running the Violectric fully balanced all the way from the source to the cans using an expensive Zeus OCC Copper balanced aftermarket cable. With the LD I just use the Audez'e stock cable.
What I liked about the Violectric though was its blackground. Stll I preferred my LD by a slight margin.
As the V181 and V200 are very close in SQ, I hope the CMA800 is a significant upgrade from the V200? Or else I don't really understand the fuss about the CMA800.
John-how does the CMA800 compare with the Taurus with the HD800s? Been eying both of these lately for some reason...
-Daniel
Thanks for that info. I don't have a Bakoon here to compare but throwing the CMA800 up against the Violectric V200, AURALiC Taurus, Analog Design Labs Svetlana II, and Icon Audio HP8 mkII (all excellent amps in the $1000+ range), I find the CMA800 to hold ground very well. It's just got such a killer sound to it that seems almost unique. But then again each of them has their own character.... but CMA800 is definitely up there with the best of them.
I'm working on my full review for InnerFidelity and hope to have it up soon - more people need to hear about this gem!
Just saw this thread and the current mode thing piqued my interest quite a bit.
From reading the entire product page, it would seem that it's just a current gain amp, with a normal voltage output. Which makes sense as otherwise it wouldn't work well with anything but headphones with flat impedance curves.
Still in interesting amp though...
Nope, it's a transconductance amp - voltage input, current output. Their "TransLinear Loop" circuit means headphone impedance is not an issue. Or at least that's been my experience, and that's what I make of their engineering descriptions so far. They are still translating some things for me so I can complete my review at InnerFidelity.
I'd be willing to admit that I was wrong, but that's my impression from reading the website. Just ask them what the output impedance is, that will answer the question for sure
OK, so I have to eat my words - and rethink my entire approach to this amp. The output is indeed in the voltage domain. So they use a current mode gain stage followed by an I/V converter. Still trying to figure it all out, and the language barrier becomes an issue for technical stuff.