Soundstream Compact 4-channel car amplifier — 90 watts RMS x 4

If you're in need of an amplifier that takes up liitle space but delivers a big sound, Soundstream's Stealth amplifiers can fill the bill. At about 3" deep by 7-1/2" wide, the ST4.1000D 4-channel amp will fit just about anywhere, delivering 90 watts per channel to your front and rear speakers, or up to 250 watts per channel in 2-channel mode to your subs. That's a lot of power in a tiny package. The ST4.1000D also features high- and low-level inputs for a variety of applications, and includes high- and low-pass filters to help you tailor your sound. And Soundstream built this amp for the long haul with its MOSFET power supply and military-spec circuit board, surrounded by an aluminum alloy heatsink and guarded by full short-circuit, thermal, and overload protection circuitry.