Want an amplifier that is built to last? Go for Diamond Audio D400.1 400 Watt 1 Channel Amplifier. The Diamond D400.1 mono amplifier sends up to 400 watts RMS of clean, pure musical power to your subwoofer or speaker, with no audible colouration or distortion. The D400.1 comes with a remote level controller, so you can adjust the amount of bass from the front seat. The focussed mass heatsink draws heat away efficiently by attaching 75% of its mass directly to the components that create the most heat. The amplifier's output transistors also mount to the heatsink using a special system that provides better heat flow than commonly used clips. The D400.1 features a variable low-pass filter, a bass boost, and a phase switch so you can tune your sub system to sound its best. But keep in mind that this is a full-range amplifier with a high-pass filter. You can use a pair of these amplifiers to power component speaker systems with great results. A pair of preamp outputs makes it easier to add more amplifiers when you want, without having to run a new RCA cable to the receiver. And you'll also find speaker-level inputs for hooking the amplifier to a factory stereo that doesn't have RCA outputs.