Just got these. Just using my PA2V2 + 5.5Gen Ipod. My previous can was a DT770/80. So far I don't know how to feel. I'm not overly impressed to be honest. Maybe they just need a period of breaking them in?
Also, using a 1/4 to 1/8 adapter by sennheiser.
edit: maybe I'm just a basshead.
Had the exact same reaction. Returned them. I'm a basshead. It's ok.