I have similar headphones - All High impedence dynamic driver from ZMF and Sennheiser.Read most of the thread and used the search, but other than a single member nobody has mentioned the synergy between this amp and high impedance headphones, like ZMF, HD800, etc...
I'm heavily invested in high impedance headphones, and already own a great OTL amp as well as a fantastic tube based DAC so i'm looking for a solid state 'one amp does it all' solution that can not only do well with planars, but also dynamic drivers from 32-600 ohms.
Thoughts?
many a times this wall of sound effect comes from a cold R2R NOS DAC. Try OS in Hqplayer and then feed it to May DAC.But isn't the point of bias control is to make it sound mostly the same? As far as my experience goes with Amp-23R I noticed slight change but it can be due to R2R warm up or my ears (brain) adjusting.
Well for me combo May and Amp-23R can be troublesome. With 1266 TC it seems great (still need to test more) but with LCD-5 it's sometimes too much. There's to much going on in the mids in busy tracks and it all sounds like a wall of sound. In other trakcs it's too calm and polite as if it has no life. Too close to neutral for me it seems. I advice warmer DAC with more musical midrange.
Most friends I know use HQPLAYER with May DAC. The DAC is average without it as per feedback.