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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.
The Impulse 4.320 comes with input harnesses that let you connect to any aftermarket receiver or a factory radio. Separate filters for the front and rear channels optimize the sound for your speakers and subs. An adjustable phase control on the rear channels comes in handy for tuning a sub's sound to blend in with front speakers.