I recently got the hd6xx and it seems I'm stuck with where to get the best sound out of them when pairing them with my record player. I currently have them plugged into a shereood s-7450 cp reciever. Would i see a large improvement if i went record player> pre amp> headphone amp? Is what i havenow fine? If i only use them for vinyl is a dac neccessary? And i should upgraded can you suggestions? My thoughts right now with zero help or clue was the cambridge duo preamp and the thx aaa when it drops? Any help would be great everyone.