That noise......

[Motovet 10+ year member]

I've done tons of stuff to our Tahoe, but the only thing electrcal is a headlight harness for high watt bulbe and all on high beams. I just can't imagine what it could be. If one amp works well at a ground point, shouldn't two amps work there as well? My system is great as long as the sub amp is not powered.....both amps i've tried. Can noise be induced somehow to power wires?

 

[Motovet 10+ year member]

Anyone have any ideas?.....something I can try?

 

[Motovet 10+ year member]

Pleeeeeaaaseee....

 

[helotaxi 5,000+ posts]

Have you tried grounding the sub amp all by itself? Double check all the power and ground connections throughout the whole system.

 

[Motovet 10+ year member]

I was thinking of that last night, and will try today. Is is possible a grounding point is good for one amp, but not good enough for two?

 

[Motovet 10+ year member]

I'm just overwhelmed with this one. I checked my ground spots and they all read 0 on my Fluke. I tried both amps together in one spot, in seperate spots, and even tried a new spot. Also decided to run the HU directly from the battery and bypass the harness...no change. This is what I tried and results:

1.Sub amp not powered = no noise.

2. Both amps powered with all connections = lots of noise front speakers.

3. Both amps powered and RCA's from sub disconnected from HU = less noise front speakers.

4. Both amps powered and RCA's from front amp disconnected from HU = very slight noise front speakers.

5. Both amps powered and RCA's disconnected from sub amp = less noise front speakers.

6. Both amps powered and RCA's disconnected from front amp = no noise.

7. Both amps powered and RCA's disconnected from both sub and front amps = no noise.

8. Front amp not powered with all above connections = no noise.

So why no noise with either front amp not powered, or sub amp not powered, and only when RCA's disconnected from front amp with both powered? What else can I possibly look for? Again I ask....can power wires pick up noise somehow? Is there a bigger grounding issue than the spots for the amps? Thanks for much needed help before I loose it.

 

[Motovet 10+ year member]

200 plus and no more ideas? I'm screwed unless someone has any more thoughts on this. System sounds great if it's cranked to cover that horreneous noise!

 

[Motovet 10+ year member]

To add to this the system also has no noise if I run the rear and sub amp with The RCA's disconnected from the front amp with all amps powered. Someone PLEEAASE HELP!

 

[Frankensuby 10+ year member]

I think you have exhausted this collective forum.

I'd suggest taking it to an actual audio shop, sending it off to the manufacturer for them to cover warranty (if it has one), or to become friends with an electrical guru real quick //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[reneeb7363 10+ year member]

I can't remember whom the original OP was...but, on the Pioneer head unit he had to ground the rca's on the back of the HU...took a copper wire and wrapped it around all 4 rca connectors then slid on the rca's themselves to hold in place...I did something similiar to mine...helped with some of the noise. Just a suggestions... can't find the old thread yet... will keep looking.

 

[Frankensuby 10+ year member]

I can't remember whom the original OP was...but, on the Pioneer head unit he had to ground the rca's on the back of the HU...took a copper wire and wrapped it around all 4 rca connectors then slid on the rca's themselves to hold in place...I did something similiar to mine...helped with some of the noise. Just a suggestions... can't find the old thread yet... will keep looking.

Had this same issue. FYI Pioneer fixed this in the new series with an onboard fuse for the RCS Pre-outs.

Mine was not cured by this wire though.

 

[Ctminime 10+ year member]

i had that same issue with my old pioneer.... then i got an alpine... that fixed that problem right quick

 

[thatsgonnahurt 10+ year member]

how did you do set the sensitivity of your amps? did you use a test tone cd and a dmm or o-scope?

 

[Motovet 10+ year member]

I am now using an Alpine... This is my second HU as I suspected the Pioneer was the source of the noise. Playing with the gains will surpress the noise, but it's still there.

 

[thatsgonnahurt 10+ year member]

how loud is the noise? can you hear it from your seat or do you have to put your ear up to the speaker?