[rensli]

Hey, Excuse me for writing in English, i Perfectly read/speak Russian, except that i am not so good in writing.

The problem is that i have ATH-A900 40R impedance piano monitor headphones, Cable is 3 meter's long and almost all possible DIY audio headphone buffer amplifiers are bad into this phones.. ONLY a JLH design was good, Softer then most i have tried(OPA2134x4, NE5534/32x6 @ buffers with different kind output resistors).
I have also build SC studio headphone amplifier, Sapphire headphone amplifier, all of them still FAIL's.

I could make things better by placing 100R resistor in series with the output, all amps then becoming more "softer" but still not very pleasant yet....

Problem is in this headphones... with that long capacitive cable + maybe not very linear drivers... they are hard to drive ??

As i saw this Nazar A-class amp is well designed against RF and capacitive loads... should i try this schematic ?

Renu