JL Audio 500/1

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Ok got the preamp board that belongs on the amp..

Amp will power up and play audio but as I increase the gain the output decreases ..

Also I notice a squealing sound thru the test sub..

If I touch any switches or pots I can get the test sub to suck in almost like there is DC across the speaker terminals ..

Any ideas where to start checking ?
 
The signal source is grounded to the 12 volt power supply..

I've tried 3 different preamp boards and still have the same result ..

With the RCA's plugged in or not plugged in the amp the amp does the same thing ..

When I increase the gain on the amp or increase the head unit volume the amp will decrease in output and is very distorted ..

Also if I move any squtched the sub will suck in ..
 
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