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assuming that both subwoofers are working fine: check what voltage output your headunit has (RCA output voltage) and match it to your amplifiers input sensitivity (GAIN) eg: if your headunit has 4 volt outputs then on this particular amplifier your gain knob would be completely to the left as if in the off or 0 posirion.
if u are not sure of your headunits output voltage you could check the manuals specification page or send me the barand and model number of your headunit and I will check it for u.
hope this helps. let me know if I can assist you any further.
um sounds like there is no sound input, if you are running rcas ensure they are plugged in and the radio and headunit, and check for a cut in the cable, this is very unusual not to have any power output at all, triple check your headunit outputs, and your amplifier inputs, make sure you arent crossed anywhere. hope this helps
I know loads of ppl who have had the same problem. Are you getting an output from ur headunit RCA's? Sometimes you need to turn the sub RCA's on via ur headunit. I would make sure im getting an output from the headunit first.
Cables are either shorted, or deck is putting out too much power for input on amp... many new head-units will put out up to 7v on the output jacks (RCA) the amp may only want to see up to 1v will need to consult head-unit manual for adjustment of outputs.
I'm afraid you must go to the back of the headunit... your only other option would be to catch the wires in the door sill going towards the back, or catch them in the kick panels going towards the front doors. This will prove to be much much harder than just removing the headunit.