In the past it's been fatiguing and generally unsatisfying. Today I gave it +5 db at 40 Hz and kept the volume low.
Why don't you try a targeted EQ based on measurements? I use this one: https://www.dropbox.com/s/zsp3jucy5lsty0m/Sennheiser%20HD800S.pdf?dl=0 It's free, you have nothing to lose. Adjust the bass boost for taste. Listening to the HD800S with this EQ made the HD650 obsolete for me.
I've never tried it, been told it's not a great pairing though. I really only find the 800S worthwhile on OTP amps, not that I use mine super frequently at that.
EQ on the hd800sdr made all other headphones obsolete for me too. Been pleased as a peach with them for almost two years now
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