I have a home theatre system with four speaker and a sub with built in amp. the speaker is analog, wires are hardwired in the satellite and connected to the sub with 2 ends for each speaker (one red one black). the problem is, im living in an apartment and im suffering radio feedback. I can hear radio from my speaker once i turn it on (nothing connected to the speaker, just the four satellite to the sub) so im very sure that its not the audio cable thats causing the problem, but anyway i bought a ground loop isolator and connected the audio cable to the ground loop and then connect it to my processor. I bought a couple of earth magnet and tied it on my satellite wire end, also i twisted the satellite wire with bare copper wire and connected one end of the copper wire to my heavy metal speaker stand. I nvr tried ferrite beads though since i cannot get any of them in canada still im suffering interference from radio, though its not very loud, but i can still hear low hissing noise. are there any better solution for my problem? ive tried fixing it for almost half a year already but still no hope! any help would be greatly appreciated, thanks.