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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Online Car Stereo
Founded in 1999, the OnlineCarStereo.com team has worked to put together one of the largest selections of car audio/stereo in this country.