Quote:
Originally Posted by LugBug1 
I found this to be the case too, maybe and ideal choice for use with say the 650's? The op2107 has a more full bodied character, deeper lows and less fatiguing highs (typical Burr Brown)
I've only experimented with a little dot amp, so take this with a pinch of salt 
Definitely - the metal can 4562 is pretty special with HD650.
