Whistling Sound In Speakers When Car Is Running.

1. A quick and easy way to stop that terrible whining noise coming through your car stereo speakers is to use a ground loop isolator or inline noise suppressor. You can view Inline Noise Suppressors Here . These can resolve the issue. Check it out. They don't look awful and they're easy to use.

2. A simple solution can usually fix this engine noise problem. Change the stereo ground location. Most times this can be done and un-done(if it doesn't help) very easily. Behind the stereo will be anywhere from 10 to maybe 16 wires coming out of the stereo into a wire harness clip. Between the stereo and the first wire harness clip you will need to cut the ground (Black 12V-) wire.

This will break the ground and the stereo will not turn on at this point. The part of the wire that is coming from the back of the stereo will need to be lengthened and run to an alternate grounding location. Most of the time there is a bare metal dash frame under the upholstery that you will see when the stereo is removed from the dash.

With a digital multi-meter in hand you may test for a good ground source. Make sure to set the meter to test for continuity. You can make sure that the meter is set correctly by touching the lead ends together, this should give a beep or chirp from the meter letting you know that there is continuity. Clip one of the meter leads to a known good ground (somewhere in the door jam usually works) and then you may begin looking inside the dash cavity for a ground location.

Once you have a beep or chirp from the meter you know you have found a ground location. We'll only know that this is a good location or not once the ground is hooked up and we turn the stereo on. Until then, cross your fingers and hope for the best. Hooking up the stereos ground wire to the new ground location is up to you. Every situation is different so you may need a crimp end or some other modifications inside the dash cavity to get the ground wire hooked up.

Just changing the stereos ground location will often resolve the engine noise problem. When this doesn't work we resort to a "Ground Loop Isolator" or "Inline Noise Suppressor". There are a few different styles that are used for different applications.
There are noise suppressors that are used in the power line, in the RCA/audio cable lines and some with 3.5mm stereo cable input and out put. You must determine which is right for your application.

Some stereos will only create this whining when there is an auxiliary audio input used. These will usually be something like an MP3 player. There are ground loop isolators for use with MP3 players.

This little amp seemed like it would work just fine after I installed it. Sound wasn't great, but i must admit it was at least as good if not better than expected for the price. Then I turned the ignition on, and the noise was insane! Buzzing, repetitious clicking, whine, etc.. It was the worst I've ever heard, truly, and i've owned some pretty cheap amps before. Anyway, I tried a Boss inline 12A power filter. Works great sometimes, but in this case made it worse actually. Then I tried an old in-line RCA filter i had thrown in the electronic scrap box because it didn't work and I couldn't return it. It worked on this amp! This is a Left/Right RCA filter that says "20 Amp High Quality Noise Suppressor Isolation Transformer" on the outside housing. It didn't work for the application I bought it for (so I got a BSN40 and it did work.) Glad I saved this one though, because it killed every noise the amp was making and sound quality was not compromised.

What causes whistling in speakers?

One of the most common causes of speaker whine comes from the vehicle's alternator. If the noise changes in pitch or intensity when the engine RPM changes, then it's a safe bet that you're dealing with some type of engine noise, and interference from the alternator output is a likely source.

Why is my speaker making a high pitched noise?

The higher pitched and more irritating 'buzz' is typically found emanating from the loudspeakers and is usually caused by a ground loop. The most common cause of hum is the ground loop - fortunately it is also the easiest to solve.