Slide your PSP onto this Gamexpert Phase 4 PSP Hi-Fi, and shake the rafters with 23 watts of stereo goodness through a couple of midrange drivers, while rocking the foundations with a down-facing subwoofer that's equipped with what the company calls "maximum bass extension."
Although it's made for the Sony PSP, you can hook up other devices to its auxiliary input, and either way, you can control at least the volume with its remote. Too bad its design is so clunky, looking like a crude, homemade Apple iPod Hi-Fi. Oh well, it's your 200 (around $376).
Gamexpert launches the PSP Hi-Fi [Tech Digest]