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i have a kenwood KAC-6104d hooked up to a slim line 1200 watt max sony 10' slim line sub. I originally had the sub and amp connected by speaker level input but i just installed a aftermarket head unit, and it seems a lot quieter than before, what should i do to correct this. (i do not have the remote wire connected to the head unit i have it set up as a loop with a switch for family rides, would that make a difference)