help with system

[milleniumz]

I installed stereo four years ago and have never experienced a problem until recently.

I have a Alpine Head Unit (xm ready), PPI 4125 amp, Utopia 6.5's, one JL-10w3. Added XM module 1 year later (installed under drivers seat).

This weekend, I checked my sub wires, my sub, and redid my amp ground wire (to the car, and to the amp).

I am getting a intermitent interference in my sub. What is the problem? Circuit City actually installed the HU and I am sure they used factory ground. Could that be the problem? I am not a stereo expert and have enjoyed my system over the years and am now getting frustrated.

Thanks.

[White Rascal]

Can you give a description of what exactly this "interference" sounds like?

[milleniumz]

Sounds like static in the sub with volume at zero. Hope that helps.....it is not constant, just when I thought I fixed it....the sound came back...thats why I thought I would ask for help.

Thanks

[chad3113]

When subs start to go out, i've always had a "static" sound at low volumes whenever the sub would hit. If i turned it up, the static goes away, but eventually the sub would go out. I beleive in my case it had something to do with the voice coil going out. Dunno if that applies in your case

[QKSLVR99]

had sim problem with a friends car I messed up and ran the RCA wires and the power wire down same side of the car it was causing s little static

[Mjolnir]

make sure the RCA and power are on different sides, make sure the RCA cables dont have a cut or anything on them (a friend ran a trim screw threw his RCA and grounded it). check the ground.

Does it get louder when you rev it?

[fredmr85]

Could be RCAs, or RCA locations, or just bad HU preouts.. When the non-fading level/sub preout volume is lower -- you aren't getting the full XX Volts of the preouts - so it is more susceptible to nouice -- which goes away as you turn it up because you are increasing the pre-out voltage, and higher pre-out voltages have greater immunity to noise. Try resetting gains on your amp and be sure that bass boost, all EQ options are off and turn the non-fading / sub preout level on your HU all the way up.

[amanc96]

if you never had the problem before you redid your ground wire, then i think you probably just have a bad ground connection.