[KJDJ]

Baseband out of a camera Video 0-5Mhz. RG-6 .61 Db/100ft loss at 5Mhz.
Composite Video includes audio add another 1 Mhz 0-6 Mhz .69Db/100'

Capt. I add like Drax, use the direct box out of your PC you need the common mode noise rejection that a balanced line gives you. Plus you will get the added electrical isolation safety between the PA and PC.

I personaly don't run more than 3' with unbalanced audio lines with my PA or DJ system.