In most cases, the hum is caused by having a cable box or satellite dish being grounded at a different point in the house and you trying to feed the audio signal from the tv/monitor to the system. Disconnect that input on your integrated and see if the hum goes away. If it does, then the solution is a Jensen Iso-Max. Fix the hum - do not use the low level input.
REL .LFE input
I just purchased the Technics SU-G700 integrated and it has a left and right pre-out that can be used for a subwoofer - my REL.
I’m currently using the high level connection but thought about trying the LFE connection as a way to reduce a very low level hum I’m getting in the subwoofer. No amount of connecting he system to one power outlet or grounding has solved it, and it only happens once the speakon connection is connected to the subwoofer.
My only issue with this LFE solution is that there is only one single input on the subwoofer, but the pre-out is in stereo. The question is how much audio low bass information am I losing if I only run one RCA from, say, the right channel on the integrated to the sub.
BTW, this is a dedicated two channel set up, not used for TV.