Dirty voltage PC Power Supply

[croco64]

Hello everyone,

I just got a brand new PC power supply and I have a little problem with it.

First of all I'm using it to power up a car amplifier, the issue is that there is a constant humming noise coming from the subwoofer and the only way to eliminate this is by using a car battery, so the problem is not the amplifier...

Can anyone please tell me how can I get rid of the humming noise, does removing ground prong would make any difference or is there any modifications that can be done to the power supply?

p.s.: worse comes to worst I'll be end up using it as a bench power supply, but for now I would really like to know what makes this humming noise ...

Thank you!!

 

[doctormord]

Ground loop. Try with a mobile audio source.

 

[infinia]

RCA to RCA Ground Loop Isolator

do not remove ANY safety grounds

https://www.google.com/search?q=Bos...w#tbm=isch&q=RCA+to+RCA+Ground+Loop+Isolator+

 

[mrWagner]

PC power supplies can have quite wide range of noise on their lines.
What kind supply is it? Only the 12V line is used?

Short the input to see if it comes from the input or from the supply side because of ground loop.