There are several kinds of vehicle audio amplifiers on the market, and it is critical to pick one based on how you intend to create your audio system or, in the event of an existing system, how you wish to add such a device.
The number of channels can be used as a selection criterion, specifically relating to the amplifier's outputs. Thus, the number of channels is directly proportional to the number of connected devices, specifically speakers and subwoofers. Therefore, if you want to connect a system with two speakers, select a model with two channels; if you want to connect a system with four speakers, choose a model with four channels; and so on.
Many sports vehicles, as well as trucks, are equipped with only two speakers, making a two-channel amplifier type quite desirable. The most popular is the four-channel type, which is capable of powering two front speakers and a rear subwoofer through a bridge.