Jerry,(jandel) offered me a loan of his dac/pre/headphone amp and i gratefully accepted.
It arrived promptly today and i eagerly opened it. Initially tried it with my pc rig on usb via jriver and spotify to the oppos... there was a distinct lowering of sound quality in comparison to the smsl m6 i use.switched to the dynamic driver AT phones and it was indeed very good.
So, now to where i intended to use it; in main system. On coax and optical( think i marginally prefer optical) the sound from the cd player is very nice on both headphones yay! Plenty power on tap for my cans. Impressed with it. Think i will get one