Boostaroo Revolution Portable Headphone Amplifier
“Of the myriad accessories now available for portable music players, and specifically iPods, only a tiny fraction have anything to do with improving sound quality. If you want to hear more from your portable it pretty much comes down to headphones and headphone amplifiers. Designed to drive the cheesy white earbuds that come with the thing, the headphone amplifier in an Ipod isn’t quite up to the task of driving the more difficult loads presented by less sensitive, larger, sealed or open-back type cans like the big Sennheisers and AKGs…”