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jlyt16's picture
Last seen: 1 year 11 months ago
Joined: 04/08/2012 - 11:31
Posts: 19
possible ground loop issue

I have just set up my surround sound, i have a yamaha RX-A820 and mordaunt short speakers. The problem is that when I plug the sub cable into my mezzo 9 sub there is a loud humm coming from it. When I unscrew my sat cable from the wall the hum stops. Is there an easy solution for this, any help would be great?

Andrew17321's picture
Last seen: 20 hours 59 min ago
Joined: 12/11/2008 - 19:59
Posts: 179
RE: possible ground loop issue

I had a similar problem with my sub.  I cured it by disconnecting the earth wire in the mains plug to my sub.

I cannot recommened that you do this as the earth wire is there for safety reasons, especeially if there are little ones about.  The alternative is to diconnect the other earth connection to your sub, the outer conductor on the interconnect.  It might be enough to pull that plug out a bit so that only the inner bit of the plug connects with the sub. 


RobinKidderminster's picture
Last seen: 8 hours 37 min ago
Joined: 27/05/2009 - 14:24
Posts: 3094
RE: possible ground loop issue

For earth integrity & safety can u try to earth other plugs/terminals to a good earth point? I needed this on my tt many years ago. Sorry if this is of no use

Yamaha V2065. MS Mezzo 5.1 Panasonic 42. Sony BD. Garrard 86SB. WD Live TV. SkyHD.



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