Major hum on new Subwoofer
Hi, I recently upgraded my subwoofer from a Monitor Audio Silver to a Monitor Audio PLW15 - however I am now experiencing a pronounced hum on the subwoofer.
I think I have isolated the source to my plasma, as when it is powered off (not unplugged) the noise goes and when I change channels (even without a source selected) or if a brighter screen comes on the noise level is increased. I have unplugged everything and am convinced that the problem is my plasma.
The plasma is wired directly into the mains on one wall and the sub is plugged on the wall to the side. Having looked at the wiring - everything looks ok. I have plugged my old sub in and the noise is just not there at all, plug the new sub in and the noise is there - I am presuming its down the to lower frequency response of my new sub but any thoughts or ideas would be very helpful.