Greetings, I have built a 2 channel power amplifier + subwoofer into the car today, power and remote are no problem. My radio has 2 chinch connections, R and L. At the power amplifier I connected these to a channel and the sub to the bridge. Unfortunately no sound comes out. The chinch cable has been tested and works exactly like the SUB. On my radio there are no extra settings for the chiich outputs. At the power amplifier I turned all channels on whether toimdnest since the error qua have I connected this wrongly? The power amplifier is a g power 1200-4