Due to unfortunate circumstances i have recently inherited a Martin Logan home entertainment center. In the package i have a balanced force 210 subwoofer speaker. i have to part with it in order to pay funeral expenses and i am absolutely at my wits end. When testing out to begin with i had NO CABLES plugged into it except for the power chord into an outlet. To test it at home before trying to sale it (please keep in mind im not very tech saavy) i literally unplugged one of those red white and yellow RCA chords from an old dvd player i wasnt using and hooked one end up to my television and the other end into the subwoofer. While using my roku for youtube at home , it worked PERFECTLY. (great sound) Now heres the tricky part , once i unhooked it to take it to a friend of mines house to see if they would take it , upon testing it on his tv , it would not transmit sound. Normally i would think i messed something up but whilst the RCA chord is plugged to the back of the speaker , if you touch the connectors on the other end (the end that was plugged in audio ports of tv) it makes a booming noise which lets me know the speaker is still operable. But now that im back home with the original tv , it wont work again. I dont know what i did / or am doing differently from before but any assistance would really be greatly appreciated. I hope ive explained the situation well but if not please ask questions so that i may get this resolved as quickly as possible. Thank You in advance !