These are definatly my favorite cans . I bought them intending to amp them even though they have a low impedence they can take 3000mw . I have always been a bass head but i require clean bass but a lot of it!! Being in car audio for years ive always loved the sound stage u get from a dozen subs and a few thousand watts, but in headphones that sound pressure was un-ubtanable ..... until now these SONYS with some real power do the job nicely . I been running mine mainly on a fiio e12 with an lod to ipod on the go and at the house I use fiio's e9 or...