Uh, I went and got two 75 to 300 ohm transformers and put them between my cable line and my cable box. It fixed the hum coming from my sub but also eliminated my high definition stations from my cable. Why is this happening? obviously the digital feed won't come through, but my analog channels are fine. Can someone explain to me why this happens and if there is a cheap way to fix the problem and keep my HD channels.

7.1 theater room
60 fronts vp180 center 4 qs8's ep500 sub

3.0 tv room
m3's vp150 center