Got my PM-3 headphones and HA-2 SE headphone amp/Dac today. Plugged headphones into my puter system and groved on EDM for a while . Killer bass and really nice tonality. Nice comfortable headphones. I bought these together for the Synergy. Using Sony A17 HiRez walkman to push them, but Sabre DAC in Oppo is doing all the work. If you want to move up the headphone ladder, This is the one. Its efficient enough to go portable. It also likes its power. I will run these headphones about 7 days 24/7 when I return from GA to give them a nice break in.