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frogcase2002

feedback/whine through mids and highs

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Trying to get some ideas on what could have caused this . . Installed 2 ppi 900.4s and a taramp 10kw in a vehicle yesterday and tested everything and every this dead quiet.  Not a bit of any noise. Later last night we installed a ampere 9k in the vehicle and now im getting sounds through the mids and highs . . Only thing that was done was taking out the taramp,  putting in the ampere and installing a new volt meter . .  Just trying to get some ideas befor I go into the shop today on What could have cause this when just changing the sub amp

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The grounds aren't perfect anymore.

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Ill check all the grounds . Didnt mess with any grounds though . Just added another run of power and ground from rear batt to the ampere

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There is a loop...could also be the RCA's grounding of the new amp.  Definitely should find it in either a loose connection or a ground.

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Well I hooked up an old ground isolator to the sub amp rcas and there is not a peep coming through the mids and highs . . 

I guess im not understanding something . I dont get why the sub amp would effect the mids and highs amps . There was no sounds coming through the subs just the mids and highs and the sound would go away when I took the rcas out of just the sub amp

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It sounds like the new sub amp created a ground loop sending stray noise interfering with your rca's.

With the filter you are now isolating the stray signal (noise).

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I'd remove it and see if you can find the source.  Try grounding the amps together and grounding the rca's

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Thats what im going to do . A  yea its not making the noises now but I dont like having to put that isolator on to get rid of it

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