Rear speaker whine (engine noise), why...?

[mikechec9 10+ year member]

Unhooked the amp completely and the noise is still there.Unhooked the HU along with the amp, noise is still there.

Now my question... Can a power wire ran along side of my rear speaker wire be causing the whine? If you say no, then why not? What else would cause this problem. It seems you all do not think this is possible.

I will take out all my rear panels/seat tomorrow and pull my rear speaker wire out (completely away from the power wire. I will see if this does anything.

Oh and by the way, all my wires are Rockford Fosgate and really high quality.

unless you have a plastic car, the frame is going to serve as a conductor for the current anyway. so running speaker wire along rca's won't make a difference. i have had the same type problem. did not see in the thread (might have missed it) where you checked your HU ground. might be bad.

also, this is what david navone recently had to say in regards to a similar problem

"If the muted amps are clean, then you're 50% done with this alternator whine project. The next step is to MOVE THE DECK... Temporarily relocate your HU, or a spare HU, to the near vicinity of the clean amp. Connect the output of the HU to the input of the clean amp using Gender Changers (Male-Male RCA connectors)... or very short RCA leads."

If not, this is navone's reputable strategy for dilineating the problem.

http://www.carsound.com/columns/navone/nav0013.shtml

 

[lotas 10+ year member]

check your amp ground...that is usually the source of alt. whine. I dont care if you unplugged your amp and it was still there (which I dont see how is possible still, they speakers are not getting any power, so how can they be emitting sound), just do it anyway. Make sure it is to clean metal, no paint, no oil, no grease, make sure it is a solid connection, like a ring terminal bolted down. Make sure your ground is relatively short, not 4ft. long. Tell us where you are grounded to also.

I would check that before I checked my HU ground. Also, settings your gains real high can induce noise, so check your gains too.

I cant tell you how many times ive had alt whine, and it was almost always been my amp ground.

Also, ive had engine noise improved by getting a knew HU (this wasnt a solution, but when I got my new one, the engine noise went away without myintention) Anyways I had a pioneer deh 5500mp, and got a deh8600mp.

dont give up //content.invisioncic.com/y282845/emoticons/toast.gif.bc0657bf54b9ee653b6438524461341e.gif

 

[sleepy stevey 10+ year member]

How can any of you blame this on my amp / ground when I have completely unhooked the amp.. that is completely stupid. When I unhook the amp completely it is leaving the rear speakers mounted, and a wire ran towards my trunk, but not hooked up.. meaning nothing is hooked up to the rear speakers at all.. How can anybody blame this on my amp/HU.. That is completely impossible.

I am going to unroute the rear speaker wire and put it over my carpet, away from any other wires, including my power. I think that the power is crossing over into the speaker wire.

 

[maylar 10+ year member]

Understand the Physics here and you'll see the reasons for these replies.

For sound of any kind to come out of a speaker, there must be electrical current flowing through the voice coil. It is impossible for open wires to generate current. It is also impossible for current to be induced in speaker wires just by being close to another wire.

These folks say it's in your install because nothing else makes sense. It's possible for one of the speaker terminals to be touching the car chassis somewhere thereby creating some kind of signal path from your powered off amplifier. That's the stuff you need to look at. Something not obvious.

Disconnect the wires from the speakers. Make sure the noise goes away. If it doesn't, you better get a patent for your setup because you've found a way to defy the laws of Physics.

 

[JoseMCeee 10+ year member]

Disconnect the wires from the speakers. Make sure the noise goes away. If it doesn't, you better get a patent for your setup because you've found a way to defy the laws of Physics.

Yea thats what I suggested before and it doesnt seem as if he has tried it yet. I wanna see what happens after he disconnects his speakers. I bet "its still there guys". You must have a UFO for a car or sumthin

 

[sleepy stevey 10+ year member]

Well I was just trying to point out that if the amp is disconnected and the speaker wire from the amp, then the amp and HU have nothing to do with the problem, yet a few people kept saying it was from one of those sources...

The wire goes straight from my amp to the speaker. There is only 1 "connection" per side. I will check both of those.

I will let you know tomorrow what happens.

 

[JoseMCeee 10+ year member]

how about this. Disconnect the amp, disconnect the speakers, take the speakers out, Throw them as far as you can. Tell us if there is still noise.

 

[pks71 10+ year member]

I don't beleive the "noise" is coming from the speakers.

Please let us know WTF is going on!!

 

[req 5,000+ posts]

ok dude. put your ear next to the speaker.

is there noise?

remove the wire TO the speaker AT the speaker.

is there noise now?

if there is, you have ghosts ****ing with your brain.

now- i had alt whine once. it wasnt ANYTHING related to grounds or induced noise.

my freggin amp was broken.

take a look into your amp actually being broken and not producing a clean signal.

because guess what - when my amp was broken, it actually hissed. i dont know how. but it did. and it scared the crap outta me because it was hot as hell.

my guess is - eaither your amp is broken, a wire is grounded somewhere (check at the speaker terminals - i had the tip of a strand of speaker wire grounded on the chassis of the speaker once and it made the amp run into protect mode), or your grounds are shitty.

that about it dude.

 

[scrappy 10+ year member]

I had alt whine to could never get rid of it so I decided to run my rear speakers off of my deck. I cant imagine it happening with the amp off. When I would turn my gain to 0 it would stop the noise from the rear. If you turn your crossover to low it will go away also at least mine did, Im currently running my 300.4 with comps on 1&2 and my 12w3 bridged on 3&4. A local shop I go to said to check for crossing big harnesses in the engine bayand interior I dont know again maybe a bad amp thats what Im worried mine is.

 

[sleepy stevey 10+ year member]

Alright guys... I finally go around to checking it out. I removed all my rear panels, etc.. I cut the pull ties I had holding the wires together. I then pulled the rear speaker wire away from both sides... Started the car... and the whine was gone. I then had a friend of mine move the wire back and forth around the power wire while I revved the car, the noise came and went as he moved it. Anyways I talked with my uncle, he majored in electrical engineering and he explained that of course the speaker wire could receive EMFs from the power wire that is was running along side of it and to run it perpendicular to have the least chance of it taking any in. Well, the noise is gone... I am happy... and the "myth?" about speaker wire running along power wire is apparently true. The speaker can pick up engine noise (alt whine, etc) from a power wire running along side of it.

 

[JoseMCeee 10+ year member]

wow 25 posts before you got it fixed. Well the good thing is that you got it fixed and no more alt whine.

 

[kuijo 10+ year member]

Ya, people told me it was a myth too so i regrounded everything and it was still there. I finally ran the RCA cables opposite of the power wire and no more hiss.

 

[Decipha 10+ year member]

^^that was wrong

can a mod please erase it for me... thanx

 

[Slody4Futbol 10+ year member]

it's a myth... if it happens its because you do not have very good grounds