Using the 4-channel amp output to drive the second amp (for the woofer) is not the cause of heat and distortion.
Most quality amps will have a set of outputs, it shouldn't be hard to find a replacement meeting your needs. If, however, you can't find such an amp, then you need to get a set of "Y" adapters and split off either the front or back output from the head unit - one part of the Y goes to the 4-channel, the other part to the sub amp.



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