And remarkably, FlySweep says the HD650 sounds nearly identical on the Bushmaster MkII headphone out as with his Speedballed Bottlehead Crack. I've never heard the Bottlehead Crack, but both the HD650 and the LCD-2 rev.1 sound amazing on my Busmhaster MkII.
Thanks for this! It kind of puts to rest my interest in getting a PM8004 - which I've been considering for quite some time as an amp for the LCD-2. Ultimately, I'll have to try one to know for sure, but losing interest is probably a good thing. Mike