Thumping

[Gearstix 10+ year member]

Okay... my buddies 97 jeep TJ.

When you turn the clarion headunit on (I can't remember the model) it will thump through the subs.

if you are at vol 1 and go to 0 it thumps. You stop the music it thumps.. If you change the track, thump. I think it even thumps when you put a CD in. Is this a grounding problem? (he insists this isint' the problem.. )

They also have a 05 Denali. It has a double din Eclipse dvd player w/ nav. It gets alt feedback through the speakers and I think it will go away if you hit a bump or tap the dash... is this another grounding problem? (again he insists this isn't the problem)?

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

Thanks guys.

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[porksoda 10+ year member]

Its probably a ground somewhere ?

But who knows lol

 

[blazinb2000 10+ year member]

Power wire ran along side of rcas?

 

[IDSkoT 5,000+ posts]

Power wire ran along side of rcas?

I don't think that would cause it.

Loud thumps are discharges of energy. Normally it only happens when you turn on the car and the HU turns on pre-maturely and the charge built up from when the car was off is released.

How is the system hooked up?

 

[blazinb2000 10+ year member]

He said it does it whenever the volume is changed, whenever the track is changed, etc. My buddy used one of those cheap line input converter boxes for his rca's on a stock head unit along with a bad job of running wires and his sub would thump just like the original poster describes his does. I dunno maybe just a coincidence but might be worth checking into after we get more info from the op.

 

[Trey803 5,000+ posts]

some amps have built in anti-thump circuitry I guess his doesnt

 

[Gearstix 10+ year member]

I don't think that would cause it.
Loud thumps are discharges of energy. Normally it only happens when you turn on the car and the HU turns on pre-maturely and the charge built up from when the car was off is released.

How is the system hooked up?

Its always done it in the jeep.

Its Scoshe wiring. I think its 4 gauge from the battery fused, to the amp at the rear, remote wire off the deck( I never wired the deck up), etc. The headunit is wired into a wiring harness. Thats all I know for now.

I know when we were bootin' it up a steep hill my buddy floored it and the headunit and the mount that it was in slid out of the dash.

 

[Gearstix 10+ year member]

some amps have built in anti-thump circuitry I guess his doesnt

It never did it when I had it wired up in the Sunfire I had. but, I was using a diff headunit.. I can't remember the model of his, I think its kinda old, has "brushed aluminum face, but its not silver its black.. best way to describe it..)

 

[jake21 10+ year member]

It never did it when I had it wired up in the Sunfire I had. but, I was using a diff headunit.. I can't remember the model of his, I think its kinda old, has "brushed aluminum face, but its not silver its black.. best way to describe it..)

older fosgate?

 

[king ranch 5,000+ posts]

ground problem i used to have the same problem u just have a bad ground

 

[Gearstix 10+ year member]

ground problem i used to have the same problem u just have a bad ground

See thats what I think it is with both the Denali and the Jeep... but he insists its not //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

Its a clarion, has a blue screen red buttons, has a silver volume knob with a rubber grip on it.. uhh it does this funny lil thing (screensaver I think) when you leave it sit playing...