This is just my opinion on some the things that were discussed... BTW, I've heard all the amps mentioned above under varying conditions and I owned the P/V before I got the BA. I have had the least amount of "quality time" with the LF, having only heard it once under meet conditions.
- If we want speed, there's nothing better than good solid-state. No tube amp is going to sound as fast and clear as a well executed solid-state amp such as the Dynahi. Few tube amps will come close, but none will equal the Dynahi. Compromises will have to be made.
- If I still had the P/V, I would probably consider copper cable. Since I already have the HD800 foam mod and the BA with specific tubes (globe PX25s circa 1930) chosen for their treble silkyness, I've stuck with the stock cable. The stock cable is very high quality, but does accentuate certain aspects of the HD800.
- The HD800s can sound dry and over-damped in the bass. Because of this, amplifiers with higher output impedance will warm up the bass region - but at the expensive of rounded bass. Again compromises need to be made. Output Z between 8-16 are ideal - any higher would be too mushy for my tastes. A lot of HF'ers like the HD800 with 120ohm.
- Tubes, for whatever reason (the tubes themselves or the topologies of the amps that they are used in) can help with taking the treble edge off the HD800.
- Just so you know where I'm coming from: I don't like stuff that's too tubey. That is a nice lush, euphonic, and romantic sound. It's nice at first, but extended exposure makes me want to throw such things out the window. Also, I cannot stand the "stereotypical" (or what many people commonly think of the tube amp) sound of bloated (overly warm bass) and rolled-off highs. I think all such tube implementations should be destroyed on sight.
Amplifier considerations - a vain attempt to approach the Orpheus sound with the HD800:
- The RWA has great tone with the HD800. However I found it lacking in resolving power. Good macro-dynamics, but the bass had a tendency to flutter with the volume cranked up. I initially really loved this amp, but its stock has gone down in my book as I've had more exposure to it over time with other headphones.
- The LF did not sound tubey nor colored. I heard the modded HD800s out of it and I thought it sounded great. Excellent tone, good (possibly great) speed, great bass control. I need more quality time with it to make a better assessment. I know some people balk at the $3200 price, but it is what it is.
- At $2200, consider the Zana Deux SE. Speedy sucker (for a tube amp) with great resolving capability. Adjustable output Z of 3 and 12 ohms to match your tastes or different headphones. Don't have to worry about output tube selection (not many options.)
- At $1800, Super 7. Very low output Z and may have to tinker with combinations of 6SN7s to get the sound right. Both a blessing (for tube rollers) or a curse (for folks who don't want to deal with that crap.) Not currently available and folks will need to wait for the next run.
- AT $1200, Woo WA6SE. The most "solid-state" sounding of the Woo amps. Does take the edge off. Lacks resolving capability and a little bit flatter sounding compared to the better amps above.
Special mentions: DNA 2A3 at $2800, Woo WA5LE $2500-$3600+ (little but more tubey and not as fast sounding as some of the above, but stuff I wouldn't mind living with.)
Or just get BA and stop worrying and be done with it.
P.S. Don't skimp on the DAC. At least not with the HD800. Just ask Tyll if you don't believe me. I cannot emphasize how critical this is because all bets are off on the above recommendations if you don't have a DAC of sufficient resolving capability. 95% of people on HF have no idea what the HD800 can do. I mean this in a honest, not patronizing way.