Whining noise from amplifier?

Question

I have an amplifier in my truck, and when the truck is running and the amplifier is on there is a high-pitched whining noise being emmitted from the amplified speakers that follows the pitch of the engine. When the truck is off, it sounds fine. Are there any devices that can plug into the incoming wires to reduce the noise?

Answer 1

Two things.

A ground loop isolator and an audio noise filter(inductive type).

The ground loop isolator goes between the HU and the amp and the audio filter goes between the HU and the power source.

It's a small chance it's a grounding issue.

___________
Well Mister,

"The devices that are sold for this problem probably won't fix it."

I find it funny that these devices have been a very quick fix in installs with no adverse side effects even when the ground was less than 18" and fastened to a "well sanded" grounding point.

Oh, and the whole "running power wires seperate from the RCA's" is a myth. I must have magic wires or something since I don't have this problem. But hey, what do I know...

Answer 2

The first thing I would try is grounding the amplifier directly to the chassis and making the ground wire as short as possible. Typically what most people will do is run the hot and ground all the way back to the battery and some manufacturers will give you enough slack in the wire to do it. Wherever your amp is located, you need to cut the ground wire down to a couple of inches and screw it down to the floor or any other part of the body that is a solid chassis metal ground.

Answer 3

You don't need a device, you need to make sure your amp is wired correctly.

The devices that are sold for this problem probably won't fix it.

1) You need to make sure your power wire (that connects to the battery) and RCA cables are ran on opposite sides of the vehicle.

2) You need to make sure that your RCA cables are not damaged in any way

3) You need to make sure your ground cable is as short as possible, as secure as possible and secured to solid CHASSIS metal. If it is loose, long, screwed into/onto a painted area, or secured to metal that doesn't connect with the chassis, that will be a problem.

4) You need to make sure your audio system has as few grounds as possible. This means that everything up by your radio should have the same grounding location, and everything back by the amplifier should have the same grounding location.

That should fix your problem

Answer 4

jeez why do human beings shop suggesting noise filters? They DONT paintings! first of all, how are you able to take heed to a intense pitched whine by way of subs? Isnt the low bypass clear out on? 2d, if your amp floor, head unit floor are all top notch, confirm your RCA's are twisted pair shielded type. even nonetheless I surely have on no account had noise by way of subs with even the main inexpensive RCA's conceivable, by way of audio equipment confident, so i think of there is something else. of direction the pinnacle unit would desire to be the undertaking, or the amp. Use muting plugs to locate the undertaking. Do a google on "motor vehicle audio muting plugs" and you will come across a wealth of ideas.

Answer 5

you do not have your system grounded good enough at least that's where I would start .dude

Answer 6

ground