My computer motherboard has a digital coaxial output on it witch i used to go to the input on my receiver. I just moved my room around, which is great, but my cable length for that cable has to be 15ft. I checked through all the stores, can't find anything over 12Ft. Is there a place that sells longer than 12ft, or is a subwoofer cable the same thing and i could you that and still get DD and DTS 5.1 from it? Any help would be appreciated.