Sony XMS400D Compact 4-channel car amplifier — 45 watts RMS x 4

Seriously small amp. Sony knows that many vehicles just don't have space for a big amplifier, so they've created the XMS400D 4-channel amp. This tiny powerhouse will blow your mind — blasting your front and rear speakers with 45 watts RMS each from a chassis that's the size of a big candy bar. High- and low-pass filters. 

Product info:

• 4-channel car amplifier
• 45 watts RMS x 4 at 4 ohms (non-bridgeable, only works with 4- to 8-ohm speakers)
• CEA-2006 compliant
• switchable high-pass filter on front channels (120 Hz at 12 dB/octave)
• switchable low-pass filter on rear channels (120 Hz at 12 dB/octave)
• preamp and speaker-level inputs
• fuse: 15A x 1
• 12-gauge power and ground leads recommended — wiring and hardware not included with amplifier
• dimensions: 7-1/4"W x 1-1/2"H x 2-1/2"D