Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems G68 zone 3 hum

I hooked Zone 3 up to an Acoustic Energy Aego subwoofer and satellites in another room and maybe I shouldn't expect better given the difference in quality of kit to the G68, but found a hum turning the volume up to very high levels without music that is not evident playing music at normal listening levels. The noise is not evident when I disconnect the interconnects from the G68

Appreciate any advice on whether this is likely to be a cable shielding (10 meter cables) or a ground loop problem (I always thought they were more severe) and if and how I might try to eliminate it.

Is the hum in the sub or all speakers? Also, I assume that there is no hum in main or 2nd zone...?

you could have an earth loop?

Hum is in the sub and speakers -- I disconnected the G68 again and found the hum is present at faint levels without connection to the G68 which I would say is normal for a subwoofer. When I reconnected the G68, it was not as audible as before, although it was somewhat more audible than without connection to the G68. I think it is probably ok. What would I hear if there was a problem like a ground or earth loop?

"What would I hear if there was a problem like a ground or earth loop?"


A VERY audible huuuuuuuuuuuuuuuuuuuuum. BTW, no hum found in DSP speakers.

One way to tell for cetain (just for this brief minute) is to lift the ground at the receptacle. No, hum...then it's a ground loop in your electical system. Hum...then it's something in your AV system.