[LAU] ground loop hell

[Roger]

On 16/02/15 11:51, Len Ovens wrote:
>
> It seems even with all power coming from one outlet, I have one 
> amplifier with some hum. It is way less and by playing with levels I 
> was able to make it so low as to not be noticed. However my plan of 
> isolating everything should fix it completely.
Look at the signal cabling or even nearby EMF sources. I recall ages ago 
having a Dbx 160 compressor in a rack under a Klark Teknik DN27 graphic 
EQ with a small but noticeable hum in the speakers. Separating these by 
1 rack space cured the hum!
And some equipment just hums by itself anyway, especially as it ages.