I am using Fostex HP-P1 + SR71A + LCD2 Rev 1 as my office rig now. The previous combo I use, the CLAS + Meier Stepdance (15V regulated)) + LCD Rev 1, was very good - so I thought - until I tried out the HP-P1 combo. In comparison, the CLAS combo sounded so clean that it was almost a bit clinical to me, and it was not how the LCD2 Rev 1 is supposed to sound. Now with the HP-P1 / SR71A combo, all the creaminess of the Rev 1 came back alive. I will also do a critical comparison between the HP-P1/SR71A combo and the HP-P1 itself (using its own amp section under mid / high gain). I will also have to do some critical listening to spell out the difference between Filter 1 and Filter 2 which I think Jude did not mention about.
Looking forward to hearing your thoughts. I am playing around with the same setup but pretty much listening with DT1350's, since they are now my primary travel phones. There are some very distinct differences between the SR71-A and the HP P-1's internal amp. Not necessarily better or worse, but different flavors to be sure. Having options is a wonderful thing.
Edited by Il Mostro - 9/5/11 at 12:31pm