If your autosound system has only two phono output jacks (left and right) and you are using only two speakers, simply connect them to the amplifier’s corresponding CH1 and CH2, or CH3 and CH4, phono jacks.
High-Level Input Connections
If your autosoiund system has only speaker outputs, you can connect them to the amplifier’s HIGH INPUT CH4 CH3 and HIGH INPUT CH2 CH1 sockets using the floating ground connection or the common ground connection method.
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