signal feedback..

[_DjScrew_ 5,000+ posts]

well, i'm running a xxx15 on a modded 1501d. i've got nicely shielded monster cable rca's and i'm getting feedback. the sub has a low rumble to it when it's on no matter what. any ideas? it's probablly something stupid that i overlooked. thanks!

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[squeak9798 5,000+ posts]

I doubt it's induced noise in the RCA's.

Might be a problem with your grounding.

Or possibly a problem with your preamp outputs.

Disconnect the RCA's from the HU and see if it goes away.

 

[_DjScrew_ 5,000+ posts]

ok. thank you sir. will go try now and get back with you in a sec!

 

[_DjScrew_ 5,000+ posts]

after disconnecting the rca's i get nothing..

 

[squeak9798 5,000+ posts]

after disconnecting the rca's i get nothing..

Then it's either a poor ground, or bad preamp outputs. Grab a DMM and put it on the preamp outputs of the HU w/ the HU on pause or something (to where there should be 0V output)....if it registers some voltage output, then the problem is definitely the HU.

 

[_DjScrew_ 5,000+ posts]

never thought of that. thanks a million sir. one more question, when you say poor ground you mean to the amp, correct?

 

[Magnetvision 10+ year member]

Sounds like you might be overdriving the inputs of the sub amp. Try lowering the gains a bit on the amp...or decreasing the input voltage going into the amp. If the amp has a selectable input voltage control...try the higher setting. This is a common problem when using line drivers with some amps....one product that is notorius for this is the AudioControl Overdrive unit.

 

[_DjScrew_ 5,000+ posts]

i'll try that, but i don't have any line drivers connected.

 

[_DjScrew_ 5,000+ posts]

squeak: i tested the preamp outputs and they registered at 0 when on pause. so it's my amp ground then? should i ground directly to frame?