So just to post a progress report, it looks like it wasn't a ground loop. I tried a few things involving earth terminals on the receiver and sub, and running an extension cord from the same power point the receiver is on to the sub at the back of the room, but the hum was still there.
I have temporarily moved the sub to the front of the room and run a single shielded RCA cable from the receiver directly to the sub and it's fine. I don't currently have an RCA cable long enough to reach my preferred location at the back but I'll make one up next weekend and run it along the side wall with the cable for the left and right rear speakers and see how that goes.
andrew027: I have temporarily moved the sub to the front of the room and run a single shielded RCA cable from the receiver directly to the sub and it's fine. I don't currently have an RCA cable long enough to reach my preferred location at the back but I'll make one up next weekend and run it along the side wall with the cable for the left and right rear speakers and see how that goes.
This needs to be a shielded cable, ideally RG59 type if you're going to DIY. Do not use speaker cable for this task.
Use cctv grade coax if you are using it. Rf stuff often has a steel or other cheap metal core so that they work better for f connectors which is a prick to terminate in anything else.
Jaxson: This needs to be a shielded cable, ideally RG59 type if you're going to DIY. Do not use speaker cable for this task.
Yeah, I won't be using speaker cable - it's the existing speaker cable that caused the problem in the first place! What I meant was that there are lengths of speaker cable running along the outside of the room to the rear speakers and if I build a long shielded cable to place the sub at the rear I will run it along the floor with/alongside the existing speaker cable.
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