Kenwood KAC-9105D Car Amplifier
The Kenwood KAC-9105D is extremely popular for a reason, with its output of 500 watts RMS at 4 ohms and 900 watts at 2 ohms. It is even 1 ohm stable, meaning you can have incredible bass from multiple subwoofers. A cast aluminum heatsink and dual cooling fans ensure that thermal shut downs aren't a concern, although it is worth noting that fans can create a bit of noise. A variable low pass filter, subsonic filter, phase switch, and bass boost (up to 18dB) provide plenty of controls so you can adjust your sound just how you want it. Small, easy to install, and punching above its weight in terms of performance, the Kenwood KAC-9150D is a great choice for the price.