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Old 02-18-2013, 10:52 AM   #1
animalcrackers
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Default High pitch sound from speakers as I accelerate?

So I just hooked up my pioneer deck, hifonics amp, and kenwood 12" sub. My friend did the wiring harness on the deck as I wired everything to the back of the car and battery.

Everything sounds good when the engine isn't on but as soon as you turn the car on a high pitch whining sound comes from the speakers and as the rpms go up, so does the sound I can pretty much tell people i have a kenny bell.

My friend said it was caused by the remote/power wire being with the speaker wires but I rewired so everything was separate and nothing. What could be causing this? Is it alternator whine?

Thank u
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Old 02-18-2013, 10:52 AM   #2
ABeastinWRX
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Alternator whine?
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Old 02-18-2013, 11:14 AM   #3
animalcrackers
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Quote:
Originally Posted by ABeastinWRX View Post
Alternator whine?
Thats what another buddy of mine said it could be, I've never heard of it though so I'm gonna go with he made that up haha
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Old 02-18-2013, 05:18 PM   #4
802-303
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Pioneer's normally show ground loop issues more than any other h/u's. A few things you can try are.
1) Better grounds. Amp, h/u, and factory subaru grounds.
2) Make sure rca's and speaker wire are complete opposite side as power.
3) ground your rca's to radio ground/ amp ground. (rap copper wire around all 4 rca's, then ground to amp on one end, h/u on other end.)

You are getting a "ground loop" because your dealing with different ground paths between a common system..
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Old 02-18-2013, 05:45 PM   #5
ABeastinWRX
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Quote:
Originally Posted by animalcrackers View Post
Thats what another buddy of mine said it could be, I've never heard of it though so I'm gonna go with he made that up haha
Haha I didn't see you suggested this... I was saying it could be that, my friend had a BMW with the same problem.
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Old 02-18-2013, 06:25 PM   #6
Corinator
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I had this same problem on my Sentra. Ended up using one of the bolts that holds the seat bracket down as a ground and now it is fine. Originally I had it ground out to the handbrake bracket, but I think that had the grounding issue because of the handbrake sensor circuit.
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Old 02-18-2013, 10:28 PM   #7
animalcrackers
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Quote:
Originally Posted by 802-303 View Post
Pioneer's normally show ground loop issues more than any other h/u's. A few things you can try are.
1) Better grounds. Amp, h/u, and factory subaru grounds.
2) Make sure rca's and speaker wire are complete opposite side as power.
3) ground your rca's to radio ground/ amp ground. (rap copper wire around all 4 rca's, then ground to amp on one end, h/u on other end.)

You are getting a "ground loop" because your dealing with different ground paths between a common system..
Does the remote wire also need to be separate from the power? Thats the only one that runs with the power to the trunk.

Thank you though and everyone else, lemme try everything and ill let you guys know what does the trick
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Old 02-18-2013, 11:05 PM   #8
Van Johnson112
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The remote wire is a positive signal so your fine running that with your power. But definitely check your amp ground connection. Make sure its tight and on clean bare metal.
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Old 02-18-2013, 11:06 PM   #9
802-303
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Your remote turn on, and power can run down the same side. Rca's and speaker wire down the other. You never want your signal to run with power. If you need to cross the two make sure it's at a 90 degree intersection.
Quality of install is number one, keep it clean. Rca's will benifit when it comes to quality and blocking external interferance. Cheaper rca's work well for subs. But spend some money on jacketed, insulated rca's for your 4ch.
Work on my first post, keep us updated.

"The easiest thing you can do is install a system with noise interferance. The hardest lesson you'll learn is how to prevent it to began with."
-D.E.I instructor I met in my install youth.
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Old 02-19-2013, 05:03 PM   #10
thewhiteknyt
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Exactly what Johnson said. And when he says bare that really means bare as in scrape off any paint. If that doesn't work try other grounding points, grounding everything at the same point, check your battery and make sure its all and well, if you have a signal processor lift the ground.

Do you have twisted pair RCA's? "Shielded" RCA's really don't do much. When the signal cable (or speaker crossover) is next to the power you are getting "inducted noise"
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Old 02-19-2013, 06:13 PM   #11
verbalwarfare1
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You are getting ground noise as stated. I installed an earth ground and all of my static noise was fixed.
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Old 02-19-2013, 07:44 PM   #12
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Quote:
Originally Posted by 802-303 View Post
Pioneer's normally show ground loop issues more than any other h/u's. A few things you can try are.
1) Better grounds. Amp, h/u, and factory subaru grounds.
2) Make sure rca's and speaker wire are complete opposite side as power.
3) ground your rca's to radio ground/ amp ground. (rap copper wire around all 4 rca's, then ground to amp on one end, h/u on other end.)

You are getting a "ground loop" because your dealing with different ground paths between a common system..

Great suggestions^


Where do you have your amp grounded?
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Old 02-20-2013, 10:50 AM   #13
animalcrackers
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I have shielded RCA's

And my amp is grounded in the trunk on one of the studs for the trunk latch. Its weird because at first it was grounded with something else (I think the tail light ground) so i moved it to a stud with nothing. This FIXED the interference and everything was sounding perfect for about 30 minutes till it slowly came back. There is some white paint back there so I definitely will sand that down tonight and see what that does.

And what do you mean by earth ground?

Thank you for all of the help everyone.
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Old 02-20-2013, 11:10 AM   #14
802-303
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A trunk lid on a uni-body car is not a ground... (think of how many pieces of metal and bolts that ground path as to travel to get back to ground..) Pull up your rear seat bottom, and sand down the paint by a seat belt bolt. drill, then tap a ground. (look twice, drill once. You have a lot of important things under there.)
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Old 02-20-2013, 08:32 PM   #15
dbmonster
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Quote:
Originally Posted by 802-303 View Post
A trunk lid on a uni-body car is not a ground... (think of how many pieces of metal and bolts that ground path as to travel to get back to ground..) Pull up your rear seat bottom, and sand down the paint by a seat belt bolt. drill, then tap a ground. (look twice, drill once. You have a lot of important things under there.)

That's where I would suggest grounding as well, under the seat bottom right by one of the seat belt bolts. you want you ground point to be on the main uni-body structure of the car. Pick a spot right next to one of the seat belt bolts, get a wire brush wheel that you can attach to a drill and go to town on the paint, you want to have a 1"x 1" square of completely bare metal where you are going to screw your ring terminal down.

Watch this for more advise.

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Old 02-20-2013, 09:36 PM   #16
802-303
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(I'm serious)
dbmonster, I enjoy your back up. I half-ass a reply, and you fill in the details and add sources.. Plus, it's good to see another person adding quality information in this "beat myself in the head" audio thread.
(-End bro-out)

animalcrackers- How's the build? If we don't hear what the solution was, I'm retiring.
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Old 02-20-2013, 09:46 PM   #17
dbmonster
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Thanks man!

I'm pretty new to this forum, and just trying to help where I can. I'm a noob to the subie world, but I'm a veteran when it comes to car audio, been doing it professionally for 10+ years.
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