Rockford Fosgate PBR400X4D: Compact Punch 4-Channel Car Amplifier

This lightweight packs a punch:

Rockford Fosgate's incredibly small Punch PBR400X4D 4-Channel amp will put out 50 W RMS to each of your front and rear speakers, giving you the power to fill your listening space through great-sounding music.  You can also run this amp in 2-Channel mode to drive a couple of high-performance speakers or subs through up to 200 W RMS each.

Boosted rail (BR) amp technology:

This Punch class BR Amplifier generates this power from a very tiny case — literally the size of your hand.  Boosted rail amp technology uses capacitors and high-speed circuitry to boost the amp's power supply voltage when needed, so it can handle musical peaks without missing a beat.  Rockford Fosgate uses this new technology to create a remarkable amp that fits almost anywhere and delivers powerful sound.

Features that keep you rockin':

The amp also features speaker level inputs through signal sensing turn on, allowing you to connect into almost any system without having to run a turn on lead back to the receiver.  An extruded aluminum heat sink combines through Rockford Fosgate's heat management technology to make sure your tunes keep rockin' — even when you're playing loud.

Easy to set for optimum performance:

The PBR400X4D features Rockford Fosgate's C.L.E.A.N. technology (calibrated level eliminates audible noise) — a setup system that ensures your music will sound as clean and powerful as possible.  Just download the setup tones from Rockford Fosgate, adjust the receiver volume until a red clip light on the amp goes out, then turn the amp gain up until a blue light comes on.  It's that simple.  When your receiver reaches maximum clean volume, you'll get maximum clean power from your Punch amp.  At quiet listening levels, you'll hear less background noise and more of your music.