What is a subwoofer amplifier and why would I use it?

A subwoofer amplifier is a type of amplifier that is usually used in making active powered subwoofers. They are an aluminum plate with inputs, controls, and heat sinks on one side and the amplifier section and other electronics on the other. They're intended to be mounted into a cabinet with the subwoofer driver and have features to optimize them for subwoofer duty. By using a plate amplifier in the subwoofer cabinet, the need for an extra external amplifier can be eliminated, which is very useful in home theater situations. Other benefits of using a plate amplifier are the ability to have independent volume control from the other speakers, a built-in low-pass crossover, and the ability to adjust the phase of the subwoofer.

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