strange feedback to sub

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ZQ8pAUL

Copper - Posts: 57

Joined: June 16, 2004

Location: United States

Posted: June 16, 2004 at 4:24 PM / IP Logged

I just hooked my old rockford 8" sub and punch 150s amp up in my new colorado and i am having a strange problem. I have the amp bridged and everything, but i'm getting feedback from the sub that almost sounds like an engine idling, but it doesn't vary with engine rpm. If i unhook the left or right channel from the amp, the feedback starts, and it doesn't matter if i unhook either one, it still stops. The only problem with this is the output of the sub is cut in half it seems. I tried moving my rca cables farther from the amp but it still did it, so that's not the problem.

If anyone has any input into the problem, or a possible solution, please let me know. It's not a terrible problem because my kicker kx600.1 and 2 kicker 10" l5s are going in the truck this weekend, but I want to make sure it's something in this particular amp/sub setup that is causing it, not my wiring or something in the deck.

Thanks in advance,

Paul Snow

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customsuburb

Gold - Posts: 1,813

Joined: January 17, 2004

Location: United States

Posted: June 16, 2004 at 4:31 PM / IP Logged

It sounds like a ground issue. If you havn't already, try connecting your ground directly to the chassis of the vehicle and scrape away any paint, if there is any.

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: June 16, 2004 at 4:46 PM / IP Logged

Could also be very high input gain setting.

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ZQ8pAUL

Copper - Posts: 57

Joined: June 16, 2004

Location: United States

Posted: June 16, 2004 at 4:53 PM / IP Logged

how do I adjust the input gain? I assume it's something in the deck? I thought it might be a ground issue so i'll give that a try next.

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DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: June 16, 2004 at 5:25 PM / IP Logged

Yes, make sure the ground is good as that is most likely. The input gain is either labeled "gain" or "sensitivity" on the amp. It must be set up to match the head unit output.

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strange feedback to sub

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