Originally Posted by AC2011
Turned on my 5000r a couple nights ago and it came on with a constant hum that won't stop. I tried turning off the main switch on the back and turning back on again, unplugging it and checking all my connections and AVR settings.
Can't see anything visibly wrong, but the hum won't go away. It's like the sound it makes if you take the cable end out of the receiver and touch it with your finger.
The cable running between my AVR and woofer is a 35-ish ft length of 75ohm RG6 cable, running through the walls/ceiling. I added the RCA ends myself.
Everything was fine until a couple of days ago - I did have a couple of other instances where this occured, but toggling the main on/off switch corrected it. Not this time.
The only thing that changed is that the other day I was working on some cable management in the back of my equipment cabinet (trying to make it look prettier). The woofer cable had been simply hanging down from where it exits the ceiling - I placed it over a hook above the cabinet.
FYI, the woofer is plugged into a Monster SW200 surge outlet as the woofer is across the room from where my main surge protector is.
Maybe I need to remove the RCA ends from the cable and reconnect them?
The first thing to do is unplug the input cable from the back of the subwoofer, then turn the subwoofer on. Does it hum? If it does, the problem is likely in the subwoofer, if it does not then we should proceed with additional trouble shooting.
The next thing would be to connect a music source to the subwoofer directly using a different set of cables. If you choose to use a portable device such as an iPod, set the volume on the portable device to 3/4. Set the subwoofer's cross-over to direct or max, then play a song with good bass. You should hear the bass portion of the music. If the hum is present, then the problem is likely in the subwoofer, if there is no hum then the problem is elsewhere in your system.
If the problem is elsewhere in your system, connect the subwoofer directly to the receiver using a different cable than the one you normally use. Test the subwoofer, is the hum present? If so, the problem is likely a grounding issue in your system, if not, the problem is likely your RG6 cable.
If the problem is your cable consider using a wireless solution such as the Velodyne WiConnect system
. This connects to any receiver and subwoofer allowing you to place the subwoofer anywhere within 50 feet of the source without the need to run signal cables.