Hey guys im looking to get a pair of these for my workouts but i have a few questions. Ok first off i know the S4-wh is a bass heavy model but is the bass too overpowering and i should stick with the regular S4? Second, i will be running these out of my 160 gig iPod classic so will i need an amp? If so what do you guys thing of the total airhead amp? Thanks for any help i can get.