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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Boss Audio BV9362BI
Bluetooth Enabled Double-DIN In-Dash DVD Receiver with 6.2" Widescreen Touchscreen TFT Monitor and USB/SD/AUX Inputs