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Loud humming from speakers

The speakers hum when the vehicle is off draining the battery and when the key is in the on position. It only plays correctly in the axillary position. Would this be an amp problem or the stereo head unit?

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  • Randy McCall May 11, 2010

    This sounds more like a wiring problem. Did it just start doing it recently or did it start when something was changed/put in

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Stereo wireing problem!

Posted on Feb 27, 2009

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Low independence light comes on and a humming sound what is causing this?


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I just hooked up my RF 325.1 Amp to my Sony CDX-M30 deck and a small 10" Alpine Sub in a small box. I ran the wiring according to the install instructions for the Amp, but I am getting a very loud...


the reason for the 3' min. on your ground cable is that interference is picked up with longer gound cables. Especially if it passes close to any electrical components, e.g. spark plugs, capacitors, anything with electrical current. These signals are amplified within the amp. (because this is what amps do) and distributed to your speakers. you could try a noise filter / noise suppressor but I've never had luck with those. You could also try finding a metal part of the frame (if there are any) and attach your ground to a bolt along that frame and if your more advanced you could create a hole and use a screw to tighten the ground to the frame. Small note to that, boats create a lot of vibration so use a ground screw with a sort of tooth like seration at the head that grips as it tightens (so it won't come lose). If you have an extra battery you may want to attach the amp directly to an independant power source to see if your getting the same hum. A direct short in your electrical system will create the same sounds. A bad ground your electrical system will do this also. You may also want to check you high and low band pass frequencies if applicable. Set them to high and you'll get a hum. I would start there adjusting them down or setting them to the center and adjust accordingly if this stops the hum. I'm running 4200 watts all together and if I adjust to high I get interference just from the force of the amp itself. Good luck. Hate electrical problems on vehicles, too many wires.

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500X emitting feedback squeaking


One source of hum is from bad rectifiers in the car alternator, if this problem stops when key is turned to accessory then have your alternator checked for bad rectifiers.Good luck and please don't forget to rate.

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Humming sound to speakers from amplifier


Hello,

It sounds like you may have a ground loop issue. I'd start by checking all the power and ground connections. Then disconnect the RCA wires from the amplifier. If the hum goes away then you should try grounding the stereo to a better grounding point, the factory grounds are usually not very good at all. Then try it again, if it is still there try replacing the RCA"s.

If the hum is still there after you've redone the connections and replaced the RCA's, you may need to install a ground loop isolator.
Both www.crutchfield.com and www.sonicelectronix.com sell good ones.

Hope this helps

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