Hi and Happy new year to everybody After a bit of perusing I have purchased some Beyer DT770 (80 Ohm) phones. I went for them for there bass performance and I wanted something to bring a smile to my face, for a while at least When connected to my PM7200 amp they do not sound as i'd expected.. The bass is their but is relatively weak, and they have no volume potential to speak of before distortion. Given that my old Sennheiser 450II sound a lot better and louder before distortion, am I right in assuming the 770s would suit a headphone amp to drive them properly. I accept that they are new out of the box and need running in, but surely it can't make that much of a difference. Any advice is welcome. Cheers, Adam.