4 channel amplifiers have 2 front (right/left) and 2 rear (right/left) channels. This type of amplifier is the ideal solution for installing 2 pairs of car speakers or 1 pair of speakers and 1 low powered subwoofer by combining or "bridging" the rear right & left channel.
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Single-DIN In-Dash CD/MP3 Receiver with Built-In MOSFET Amplifier and Front USB/AUX Input