subwoofer pre out bad?

[atlninja82 10+ year member]

so i bought a used kenwood double din and hooked up my subs and was getting this whine and when i would rev my engine it would get louder accordingly. ( this sound was from the subs) . when i tried to play them they were playing really sloppy and didnt sound right at all. so I tried grounding the shields of the rcas and still the same problem ( the whine did get better though). so i switched to the rear pre outs and it worked perfectly but now I cant control the level from the headunit unless i wanna mess with the speaker settings. is there anything I can do?

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[atlninja82 10+ year member]

bump

 

[VWBobby 10+ year member]

If the problem goes away by switching to a different pre-out then that tells me you definitely have a bad sub pre-out and need to have it repaired. Since the problem is directly tied to the sub pre-out then the only thing you can do is have it repaired.