JVC head unit alternator noise trouble

[DAAM421]

WE UNDERSTAND!!!! YOUR A DICK...OK...WE KNOW YOU DON'T LIKE ME, BECAUSE ??? i bashed your painted tail lights,,,,lets be civil......you dont have to reply that im a loser and im no help...what does your reply say in helping this guy,nothing!!!!...i have no problem with you,just the **************** job you did and the safty issue. get over it and lets help this guy out

When I say your a loser, I am not implying anything other than what you said in this thread. What I said was that I did the same thing as him except I have a different year car and that its not normal if his car does it. I don't care about the lights, so what? I think your some 13 year old kid who can't even drive and wants to annoy people because you have a bad life. You certainly seem to have the grammar and education of a 13 year old. Why are you even on the forum if you "have already done everything" (including your list of "mods" and stereo stuff), won't help anyone, or post anything original? You need an attitude adjustment that your father never gave you. Why don't you try and figure out your problems instead of being unhelpful and a burden on this forum.

[DAAM421]

BOO HOO my dad hates me you can't get a rise out of me.trust me

[RandallNeighbour]

Xclusivecar, you could simply buy a noise eliminator and put it on the power lead going into your head unit. Crutchfield and Radio Shack both sell them.

I had my Alpine head unit installed by a professional and they reused my stock amp and speakers and that alone made a world of difference. The new head unit cleaned up the sound so well beyond the nasty original becker unit that I'd never go back to a factory-look becker unit.

[xclusivecar]

Originally Posted by RandallNeighbour

Xclusivecar, you could simply buy a noise eliminator and put it on the power lead going into your head unit. Crutchfield and Radio Shack both sell them.

I had my Alpine head unit installed by a professional and they reused my stock amp and speakers and that alone made a world of difference. The new head unit cleaned up the sound so well beyond the nasty original becker unit that I'd never go back to a factory-look becker unit.

RandallNeighbor--

You win!!!!! I installed a noise filter and now the noise is DRAMATICALLY reduced. This is how it should sound! The funny thing is that I talked to Crutchfield, an installer in my neighborhood, and asked online and EVERYBODY said I was basically screwed. I would either have to live with it or put the Becker back in. Even Crutchfield told me to return my car to stock after running through many tests with me. They said a noise filter would not work. Oh well...20 bucks for the filter and I decided to give it a try...and as you stated my man...IT WORKED!!! Thank you!

[MNBoxster]

Hi,

A line Noise Eliminator is just a Band-Aid and reduces the noise but doesn't eliminate it. It also has an adverse effect on the sound, though undetectable by some.

I suspect the issue is with your Alternator. Either it's not properly grounded, or one of the 3 Diodes is shot. Do a load test on the Alternator to be sure, but I bet this is the source of your problem. Hope this helps...

Happy Motoring!... Jim'99

[JackG]

Originally Posted by MNBoxster

Hi,

A line Noise Eliminator is just a Band-Aid and reduces the noise but doesn't eliminate it. It also has an adverse effect on the sound, though undetectable by some. Happy Motoring!... Jim'99

The filter doesn't eliminate the source of the noise, but it does reduce or eliminate it from the power supplied on the load side of the filter. All head units have some basic filtering in their power inputs, the noise eliminator (filter) is just a filter targeted to that characteristic alternator "whine".

The "adverse affect on sound" that MN alludes to can only be from the limitation on dynamic current swings that music will require. One of the main components of the filter is likely a large choke, (coil, inductor) that all the DC current must flow through. One of the main electrical properties of inductors is that once current is flowing through them, they resist any change in that current flow. That would limit the dynamic range of a amplifier that is attempting to drive speakers, as it takes that 12v current flow to produce the power that drives the speakers.

In xclusivecar's case, he has no worries. He retained the OEM amplifier, and since the noise filter wasn't installed in its power lead, the amplifier still has a direct source of current supply. The head unit isn't requiring any appreciable dynamic current, since the low level audio signal paths and the outputs to the amp only require a few hundred milli-amps of current (far less than 1/2 amp).

Obviously, eliminating the source of the noise is best. Until then xclusive, enjoy the new tunes!

[RandallNeighbour]

Originally Posted by MNBoxster

A line Noise Eliminator is just a Band-Aid and reduces the noise but doesn't eliminate it. It also has an adverse effect on the sound, though undetectable by some.

This makes no common sense to me. The noise eliminator is put between the power line coming from the car and the head unit. It simply eliminates certain frequencies to pass through the power leads. It should have no bearing on what the head unit produces and sends to the speakers, but it does have a bearing on what the head unit does not transfer to the speakers.