Humming noise from speakers??

[Mikey527]

Ive got an amp sub and power cap in my boot.

Was working perfectly fine until i decided to move it.

After i moved it i connected it all back up and i wasnt getting any noise from the sub.
I disconnected the ground loop isolater i have inline with the RCA and it works but you get a loud humming sound.
I thought the ground loop isolater had gone but when i bought another one it did the same.

When i take the power cap off the humming is not as loud.

Any ideas what i can do??
i just dont get why the ground loop isolators stopped the sub from working

 

[Mikey527]

anybody???????

 

[5abr3]

have you checked the condition of the earth point (tightness etc) and the connectors individually?

 

[FIREsporting]

Check the above first mate :yeahthat:

 

[Mikey527]

Thats the first thing i checked.
Its just bugging me why the ground loop isolator stops the sub working, when before i moved it, it worked perfectly.
Confusing.

 

[mehstg]

Do your power cable and RCA leads run down the same side of the car?

P

 

[dannygp]

Do your power cable and RCA leads run down the same side of the car?

P

Mine do

 

[Mikey527]

They do.
But i have had the car about 4 months.
Not once have i had any noise from the speakers until i moved the sub into a different box.
So i doubt moving the power and RCA cable different sides would make any difference.
Even moving the sub back doesnt work.

 

[volxstu]

Earth the RCA's. Just attach a bit of wire to the barrel and then attach that wire inline to the HU's earth.

 

[Mikey527]

Whats the barrel??
And whats the HU??
Sorry probs me being thick

 

[Mikey527]

You mean from the end of the phono plug to the headunits earth wire?

 

[volxstu]

Yup
HU = Head Unit

 

[Mikey527]

kk cheers ill give it a go.
Will an alternator suppressor make any difference as i have one of these.

 

[volxstu]

If you mean Ground Loop Isolator then it may work but it is just a mask to the problem not a fix.

 

[mehstg]

Maybe it doesn't know the words....

 

[Mikey527]

no i have a ground loop isolator like i said an it cuts the sub out.
I get no noise whatsoever when its connected.
I also have an alternator suppressor which connects to the alternator to stop that from interfering as the humming gets louder as i rev.
Look an alternator suppressor up.