I received my WA5 from Modena (excellent Head-fi'er by the way). Amp was in mint condition. Fast shipping! The crates Woo supplies are heavy duty.
Have compared it to the WA22, and without question the WA5 is the better amp IMO, with my system. The soundstage seems to envelope you more with the WA5. Base is deeper, highs appear more defined. Placement of instruments are much better with the 5 than the 22. This is all with the LCD-3's, did not try it with the LCD-2's or the HD-650's. I would imagine the outcome to be the same, only not as good as with the LCD-3's.
Not much I can say more than this with respect to the differences between the WA5 vs the WA22.
Modena's WA5 was modded with a sub out and I did try hooking as subwoofer up while listening with the LCD's. You could really feel the base, but for some reason, it was distorting the sound coming out of the headphones. In particular, the highs became much more "raspy" and rough in nature. Not worth the extra base effect vs the degradation in sound quality. When I first tried this it was very bad, but realized that my RCA cord going to my sub was almost touching the umbilical cord connecting the power amp to the drive amp. When I moved it, it improved it a fair bit, but still the headphones did not sound as clear as without the sub. I did play around with cord placement as much as my patience at setup would allow, but could not remove the interference (could also be internal to the amp)? I sent Jack Woo an email about this, hope to hear back if it could be an internal problem or just shielding for the wires.
I will wait to hear back from him. If he states it is not the amp will consider upgrading the cables, as the effect with the sub was quite good if the headphones would be as clean with it connected.
Just to list my source components, I am running a 2010 Mac Mini with a solid state 60Gig internal drive for the OS (Snow Leapord 10.6.8 server, running in 64bit mode). I have and external Firewire RAID 500Gig drive that stores my iTunes library. The Mac has a USB out to my Calyx DAC which is feeding the WA5 via RCA jacks, and the WA22 via Blue Jean balanced cables. I have ordered upgraded RCA interconnects, which are on the way.
I am using Audirvana, Pure Music, Amarra MINI and Fidelia as players, and after extensive listening, am probably going to settle on Pure Music as it seems to widen the soundstage and improve the sound the most.
Most of my music are ripped CD's into iTunes via lossless encoding. I have purchased many albums online in 24/96 and 24/192 which my DAC supports and the sound IMO is to die for out of the WA5.
I stated I would be posting up some Pics so here goes: