I have to say, I'm very confused by people who say the bass is weak on the lcd2c with certain amps. I question if perhaps they are used to overinflated Beats bass or something? In my personal experience, even coming straight out of my phone via lightning -> 1/8" -> 1/4" adapter, the bass is deep and impactful. The only thing my more powerful amps give me is a bit more warmth to everything and I feel the phone is a bit more shrill and a bit fake sounding in it's brightness/clarity. Other than that, I can listen to a bass heavy track and I've never said "wow this needs more"