Weird feeback through woofer!!! HELP!!!

[kaphius27]

I have a Kia Rio Cinco 2004. It has a 1000 AMP battery, with a Size 4 Audiobahn cable (60AMP fuse installed) which which feeds:

-1 x 1000 watt 4 channel Panasonic amplifier, feeding 2 x 200 watt 3 channel 6.5 inch Sony Xplod speakers in front, and 2 x 140 watt 3 channel 5.25 inch Sony Xplod speakers in the back.
-1 x 200 watt DUB8AT 8 inch sub-woofer (bazzoka) with integrated amplifier.

There is a 1 Farad Digital Capacitor from Ichibahn in the line, placed right before where both amps feed. The 1000 watt amp is about 2 feet from the capacitor, and the amp for the sub-woofer is about 6 feet away from it, since it is integrated into the sub-woofer.

The head unit is a Sony Xplod CDX-GT680UI. The head unit and main speakers are new, but the amplifier is from a previous installation, as well as the sub-woofer. All units seem properly grounded.

The problem is that whenever I honk (Hella horns feeding from the battery, replaced on 13/july/09), or whenever I turn on or off the fog lights (Nokya 37.5 bulbs on custom installed fog lights, also feeding from the battery), I get a feedback through the sub-woofer.

Could use a tip!!! HELP!!!

[bearsfan333]

sound like your trying to run too much juice through that single battery,u might need a bigger one or maybe just get a capacitor to help the energy distribute itself better faster,because when u over load it it goes through slower.and even tho ur sub isnt that big in wattage its still the thing that uses the most energy

[PaulD]

you have a noise problem that is either coming thru the RCA's or the ground wire for the sub amp. Try taking off the ground for that amp, sanding the area around where it is connected then reconneting it.

[25Lighters]

Originally Posted by PaulD

you have a noise problem that is either coming thru the RCA's or the ground wire for the sub amp. Try taking off the ground for that amp, sanding the area around where it is connected then reconneting it.

and ditch the cap if your using it to keep your lights from dimming, it doesnt help.

[kaphius27]

bearsfan333: Actually the battery can juice up to 1000 amps. So the battery ain't it. Thanks!!!

PaulD: I´ve isolated the noise as coming though the power line.

25Lighters: The CAP is for balancing the power input into the amplifiers, not keeping the lights from dimming. Thanks!!!

[PaulD]

how does the cap balance the power ?

The ground wire is part of the power chain too, this is typically where the noise comes thru. You most likel have a poor connection or a noisy ground point. If it were the power wire, the other amp would be doing it too (unless you ran 2 seperate power wires).

[kaphius27]

Originally Posted by PaulD

how does the cap balance the power ?

The ground wire is part of the power chain too, this is typically where the noise comes thru. You most likel have a poor connection or a noisy ground point. If it were the power wire, the other amp would be doing it too (unless you ran 2 seperate power wires).

There is a single power line coming from the battery, which "Y" splits right after the capacitor, being the cap about 5 feet away from the battery, 1.5 feet of wire before the 1000 watt 4 channel amp (makes no noise), and 5 feet of wire before the 200 watt amp for the sub (a DUB8AT, which makes the noise) The sub amp is grounded underneath the rear seats, directly to the chassis.

I'm thinking of rewiring the whole car again. Could that help?

[PaulD]

Ok, so you are using the + post of the cao as a distribution point - that's cool.

I think you just need to find a better ground spot for the offending amp. Even if you sand it off, it may just be a poor electrical ground.