what causes a low hum when your system is on?

[sleazebagger 10+ year member]

when I have my system on and the volume at 0 I get a low humming. its doesn't whine to the engine just hums and then has a slight pop when powered off.

anyone know the fix?

Thanks in Advance

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[nateberrier 10+ year member]

Try grounding your RCAs

 

[sleazebagger 10+ year member]

Try grounding your RCAs

It never did this till I added a much larger setup.

Does this interference become noticeable when you use a lot more power?

 

[bubbagumper6 5,000+ posts]

It never did this till I added a much larger setup.
Does this interference become noticeable when you use a lot more power?

Do you have multiple amps? Perhaps it's a ground loop issue. You can try to narrow down where it comes from, unplug the RCA's from your amp(s) and see if the noise goes away. Perhaps it's being induced from your amp.

 

[DBfan187 5,000+ posts]

midgets whistling dixie in your trunk

 

[sleazebagger 10+ year member]

midgets whistling dixie in your trunk

lol....

I'll deduce the problem with this info you guys gave me.

thanks.

 

[sleazebagger 10+ year member]

so I unplugged the RCA's from my MA amp and no hum but when I ground the rca's out the hum remains.

I have both amps grounded to the body. will grounding them to the frame help?

 

[michaellane 5,000+ posts]

just turn your gain down a tad. its picking up noise from somewhere

 

[sleazebagger 10+ year member]

just turn your gain down a tad. its picking up noise from somewhere

That did it! thanks man.

Im still curious about this interference....

 

[Johnny Law.Lulz 5,000+ posts]

Do you use an ipod and/or do you have your ipod charging while listening ?

 

[bubbagumper6 5,000+ posts]

just turn your gain down a tad. its picking up noise from somewhere

Not really a permanent fix and it would definitely cut output...

OP how did you set your gains?

 

[sleazebagger 10+ year member]

Not really a permanent fix and it would definitely cut output...
OP how did you set your gains?

Well, I had my amp set by the local pros and they found audible distortion at a little over half. I tuned it down a little under half.

I was disappointed that he didn't use a a os meter to find the real gain distortion. I wish I had one of those tools