Ok so I'm trying to hook up an amplified PA system. I need some help with the wiring. The CB only has a spot for a 3.5mm jack. The red wire from the pa goes to power and the black is ground, I get that. But then I have two more grey wires. What do I need to go to get those to a 3.5mm jack? Will those get spliced together to a universal jack? I'm confused.