Noise,Amp

[Ben_Davis 10+ year member]

Hello

today i installed a new amp in my car for my speakers. and when i turned it on it makes a really annoying sound. expecialy when i accelerate. it used to make the acceleration noise , but no this much.

Any help greatly appreciated.

i sanded my ground point if tha helps any.

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[johnecon2001 5,000+ posts]

something is still messed up with one of your ground points. Could be the amp, or it could be the Head Unit. Check both and make sure they are both secured to a piece of bare metal.

 

[Ben_Davis 10+ year member]

i know that its not my hu. it has to b my amp. but every where i put the wire it stll makes the noise

 

[Fordfool302 10+ year member]

It could be a number of things. I could be coming from your deck and a simple noise filter could solve this problem. It could be where you have you amp grounded to or the ground line could be to long, its best to have it 3 feet or shorter.

 

[Prowler573 5,000+ posts]

It could be a number of things. I could be coming from your deck and a simple noise filter could solve this problem. It could be where you have you amp grounded to or the ground line could be to long, its best to have it 3 feet or shorter.

I'd really like to know why so many people say that. My ground cable from the actual grounding point to the distribution block it feeds would be around 5 feet long. Then you have to add the additional length of cable coming out of the output side of the distro block going to the amps. I have zero inducted noise.
If you have grounded and re-grounded and re-grounded to no avail, Ben, then I would suggest your problem lies elsewhere.

What kind of head unit do you have? If a recent year-model Pioneer it is possible that you're experiencing the infamous Pioneer RCA output ground trace problem. Apparently if you connect or disconnect the RCAs while the HU is powered on it burns something on the board internally and creates an inescapable ground loop problem that can only be remedied by sending the unit in for repair.

If that isn't it then it could possibly be bad shielding or faulty ends on poor-quality RCA interconnects.

It could be your speaker wire got pinched somewhere and has compromised the insulation jacketing and allowing in inducted noise.

It could be bad spark plug wire insulation creating RF energy to escape into other cabling.

There is no one cut-n-dried solution to the problem - you've got to hunt through your system and play Process Of Elimination until you've located the problem then correct it.

I wish you all the luck in the world, fella - this is often times a mentally painful and time-consuming process to track down the culprit. Rest assured you'll not be the first soldier to fight this particular battle.

 

[stones 10+ year member]

Try this, its an ol ghetto trick but it works pretty well.

At each end of the RCA interconnect solder a small length of wire to the outer shielding then connect the wire to the nearest ground IE- At the HU connect to the HU's ground then at the amp connect the wire to the amps ground.

This works by connecting the HU and the amp grounds together.

Explaination on ground loops.-

Ground loop is a condition where an unintended connection to ground is made through an interfering electrical conductor. Generally ground loop connection exists when an electrical system is connected through more than one way to the electrical ground.

When two or more devices are connected to a common ground through different paths, a ground loop occurs. Currents flow through these multiple paths and develop voltages which can cause damage, noise or 50Hz/60Hz hum (variable in cars) in audio or video equipment. To prevent ground loops, all signal grounds need to go to one common point and when two grounding points cannot be avoided, one side must isolate the signal and grounds from the other.

 

[Ben_Davis 10+ year member]

i have a pioner p960mp. i hope is not that. if it is what do i have to do?where do i take it to get fixed?

 

[Ben_Davis 10+ year member]

Also where could i get a noise filter?