noise

[colinmusic]

i bet this is a common problem. Apple os 10 goes out via usb to edirol ua 25 audio interface and then phono leads go out from edirol into home hi-fi and passive speakers to use as a monitor. There's a terrible hum coming from the speakers. Any idea what can be done?

thanks colin

 

[Killyp]

Does it do it on all the amp's sources?

 

[colinmusic]

noise

Does it do it on all the amp's sources?

the answer is NO. Only on the mac. I have a PC connected to the same amp and this is noise-free.

My local music shop told me to remove the earth from the amp plug.

is this a possible cure?

thanks for the interest

colin

 

[Killyp]

Sounds as though you've got a ground loop. Yes, removing the earth from the amp would fix this but I really wouldn't do it personally. The amp is earthed for a reason.

Have a look at this link. Fixing ground loops isn't the simplest task in the world, but it's doable.