Pioneer 7900 stereo is humming?!!

Just installed a new Pioneer DEH-P7900BT. Already a huge improvement over the stock unit but the stereo is producing an annoying humming sound. It is not coming from the speakers and does not fluctuate with the engine. I've had that problem in the past and this is not the same thing. Has anyone had this problem or know where it might be originating from? Thanks.

 

maybe bad grounding is my guess

 

i just had my pioneer 5900 installed and i had a similiar problem (humming and engine noise) i re-checked the ground but still had the same issue. shop installed a tsunami (sp??) filter to my amp and the problem is fixed.

filters ( had to get 2 ) cost $15.00 each from circuit city

this might help you

 

I was under the impression that you could only hear attenna noise when the radio was on. The hum occurs on any source even when the volume is all the way down.

 

its simple!!! i know this one! the wire is routed near a power chord and and the hf freqs are causing the hmmmmmm sound.. you can reroute the wires through the side panels... or make sure there is at least 1" space along side the panels.

 

Okay, I just got the truck so everything is stock except for the head unit which I just replaced. Now which wire is it that you think is next to the power cord (12V constant?) that is causing the humming? I'm using a wiring harness so I'm not sure what side panels you could be talking about unless you thought I was running an amp. With an amp, I always run the power cable and the RCA cables on opposite sides of the car. I really do hope you know the answer. Thanks.

 

okay misunderstood thaught you were running an amp... however.... did you splice in or use a connector hook up? this will start the trouble shooting process.. we can do it in real time if you would like thru pm

 

I used a wiring harness. Match up everything as usual. Today I tried to usea noise filter between the constant battery wire and stereo. Also tried grounding the wire to a different location. Still low level hum. Any other suggestions? Wondering if its just a bad unit. Works perfect otherwise.

 

no probably not...... simple question.... does it do the same when the deck is on with ignition on compared to off meaning running or not?

 

No difference with the engine on or off. If the stereo is on it hums. I can drown out the sound playing music, but being half asian, little things like that bug me. I've never heard this before on another stereo.

 

I recently had the DEH-P7900BT, but upgraded to the AVH-P4000DVD. Had humming too, found out it was my external amp had a bad ground.