FOCAL IMPULSE 4.320FOCAL (IMPULSE 4. 320) COMPACT 4 CHANNEL AMPLIFIER 55 WATTS RMS X 4 BIG POWER FROM A TINY AMP Focal designed their Impulse 4. 320 4 channel amplifier to fit almost anywhere inside a vehicle. The Impulse 4. 320 sends 55 watts RMS to each of your speakers from a chassis that's smaller than a brick. You can also use an Impulse 4. 320 in 3 channel mode to power a pair of speakers with 55 watts RMS each while sending up to 160 watts to a sub. PLAYS WELL