Be aware of the possible penalties of using programming from unlicensed programming sources. I don't know of ANY licensed sources using slingbox or DVD players that has licensed content.
Do not ignore this issue. It could cost you thousands.
We do restaurants all the time where we mono together the analog stereo outputs of a DirecTV receiver or cable box. This mono feed then goes via a single shielded wire to the amplifiers.
I'm assuming you're using a 70 volt system, so monaural is the proper type of audio to use. If you't not using a 70 volt system, you should educate yourself as to what it is and its advantages.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
