Subwoofer popping

[QwikEVO]

Whenever I turn my head unit down to volume setting 0, change from CD/Radio/Aux, or when I turn the car off the sub pops. When I turn the stereo all the way down to 0, it pops and you can hear a slight hum if you're right near the sub. I probably wouldn't hear it if the car was running, but I could hear the hum while I had my head in the trunk.


Any suggestions?


I sanded down the grounding point and recut another terminal end to the grounding point. I did a resistance check on the ground wire, had continuity and from the ground wire to the mount point was good as well.


Just FYI --- I took the sub box/amp out of the car to go to the track yesterday. Never had this problem before. It worked fine until I reinstalled it last night.

[MRCole]

Factory head unit? Or aftermarket? Need a few more details please

EDIT: after reading that again, i presume it's an after market. What kind? What kind of amp/subs, what kind of wiring and RCA's? My preliminary guess is the shielding on the RCA out puts are shot. Or, if you are using a line-level you are getting noise from that.

[QwikEVO]

Pioneer deck.
MTX sub.
Kenwood amp.
Rockford RCA's.

no line level.




This setup worked flawlessly until I took it out of the car to go to the track Sunday and reinstalled it the same night.

[jasonrp15]

Bad Ground maybe?

[egydude15]

the hum u hear means the headunit is sending a constant signal to the sub even thou there is no music being played or the sub thinks there is something going on when it's not suppose to be. check your remote wires first make sure everythign is nice and tight, if not then look at the connectors on the back of the sub its self, if it was the ground, the sub would just turn off and not make any sounds. try to reset your headunit sound settings (bass, treble etc) if the setup worked before there is no reason it should not work now unless you dropped it or something like that.

[QwikEVO]

Originally Posted by jasonrp15

Bad Ground maybe?

Originally Posted by QwikEVO

I sanded down the grounding point and recut another terminal end to the grounding point. I did a resistance check on the ground wire, had continuity and from the ground wire to the mount point was good as well.

[egydude15]

ground would not make a pop, ground completly turns off the system,

[Kevin@MellonTuning]

What model # Pioneer?

[QwikEVO]

Deh-p7700

[Kevin@MellonTuning]

I've got the 9800bt and I had that same problem. Try this and see if it helps. http://i22.photobucket.com/albums/b3...PioneerFix.jpg

[QwikEVO]

What exactly is that accomplishing?

[Kevin@MellonTuning]

You're grounding the RCA's to the frame of the HU to eliminate the ground loop or the buzz that you're hearing. More info here... http://www.caraudio.com/forum/showpo...60&postcount=1

[biggie5252]

Yes a bad ground can cause a pop, especially when the volume goes to 0 with a digital volume control. This is a very common problem with Pioneer headunits. There's a little "fuse" inside that blows. It can be caused by unplugging the Rcas with the headunit on.

Did you unplug the Rcas with the headunit still on?

[QwikEVO]

Originally Posted by biggie5252

Yes a bad ground can cause a pop, especially when the volume goes to 0 with a digital volume control. This is a very common problem with Pioneer headunits. There's a little "fuse" inside that blows. It can be caused by unplugging the Rcas with the headunit on.

Did you unplug the Rcas with the headunit still on?

Initially, no.

But did leave the headunit on while troubleshooting.



Also, my headunit has 3 RCA outputs. How would I ground out the 3rd one that isn't part of the headunit. It's on a cord thats about 3-4" long extending from the back of the headunit.

[biggie5252]

Wrap a cable around the outside and ground it. Basically your grounding the exposed part of the female rca plug (not the center pin)