Why does my Sirius radio do this?

Factual Questions
1

We keep one of our radios at the home entertainment system. There’s a Panasonic plasma TV, cable box, Sony FM receiver, and a Sony CD/DVD player situated all together. There are speakers inside the house adjacent to the home entertainment system on channel A, and speakers out by the pool on channel B. I installed a Sirius antenna mounted on the roof. I ran the wire under the aluminum soffit and tucked it under the aluminum frame of the lanai, and then drilled a hole through the concrete block in the family room to the radio. I ran the B speaker wires through the same hole. The Sony receiver picks up the Sirius on FM. All wiring is high grade. Nothing is kinked, or otherwise compromised, as far as I can tell.

My problem: When, and only when we’re listening to Sirius, there is static in the left speakers when there is bass. No other components are doing this. I’ve switched wires. I’ve switched radios. I’ve tried another DC converter. I’ve tried different FM frequencies. If the TV happens to be on in the house while the Sirius is on, there is static on the screen that corresponds to static on the left speaker. None of our three radios does this in any of our cars, but all radios do this when connected to the roof antenna and the DC converter. I’ve taken a Sirius boombox and connected the roof antenna to it; no static. I tried everything I can think of.

Can anyone tell me what I haven’t thought of?

Thanks.

2

If you don’t run the B speaker wires through the same hole as the antenna wire, do you still get static?

3

…Just for sake of argument, what if you make a twisted pair out of wires which share the same hole?

4

ZenBeam: It would be a semi-major project to dig out the caulk and try that, however I never thought of disconnecting the B wires and trying to see if it’s reproducible with a wire not going through the hole. (Channel A also has static when B is turned off.) Not sure if I’ll have time today, but it sounds like it’s worth trying.

Jinx: Again, semi-major project. Is twisting the wires together standard practice? Did I fall prey to the curse of the do-it-yourselfer? If I can take the antenna off of the boombox and it’s wire is long enough to position it to get a signal, I could narrow it down a lot further.

Both of your posts are very much appreciated!