Hum cause by plugging cable line into Monster HTS 5000

[boe]

I was worried about potential damage caused by spikes in the cable TV line so I plugged into the in(made sure it isn't the out) on my HTS 5000. The hum on my subwoofer significantly increases when I do this.

Any suggestions?

Thanks

[DanR]

Try plugging the sub into its own outlet with a simple surge protector. It isn't really necessary to have a sub go through a conditioner because it really doesn't produce an audible improvement.

[boe]

Thanks I did that - no difference. I bought a cheap CALRAD RF Inline filter for my cable line and it seems to have improved it significantly.

[David Meek]

Cable lines are notorious for inducing hum in a system. The cable company installers in many cases don't bother to connect to the house ground - they just set up a second ground - instant hum. D'oh. :nonod:

[misterdoggy]

Sounds like the Monster protection is worthless ?