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About subwoof

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  1. Crown PSA2

    Look for the 20K 1% resistor on the main board. It's green and they drift with age. Replace with ( easier to find ) a pair of 10K 1% 1/4 watt.
  2. Look closer dave..) The LF outputs have an additional summed output jack for mono subwoofer applications. Also the oddball power supply regulators were changed to industry standard types ( on later versions ) subwoof