Sennheiser hd 700. But I would also use the reversible mod for it https://www.modhouseaudio.com/hd700-mod/hd700-mod-kitThanks!
By the way, not to steer off topic, but can someone suggest headphones close to HD650 in the mid and high freqs, but with deeper (meaning more or less flat FR extended to lower frequencies), flatter and less distorted bass?
Personally, I think, the Clear Professional were it, but honestly don't know if it's worth the difference in price, and also there is still an open question concerning the "bad" drivers in some Clears...