I was given a older Rockford sub in a box with a Sherwood XA1181Q amp to put into my winter beater for some added fill.

My question is, the speaker terminals go
Ch.1 pos / Ground / Ch.2 pos
Ch.3 pos / Ground / Ch.4 Pos

So right now I have my sub hooked up to ch.1 pos and ground, when I first got the amp it was ch.1 pos/ch.2 pos but that didnt seem right since there was no ground. My question is, can I somehow bridge ch.1 and ch.2 or do I use ch.1 pos and ch.3's ground?

Also only one RCA puts out sound, Both red and white have signal but only put out sound when they get plugged into channel 1 on the rca jacks.

I know these are a lot of questions but I'm very confused and any help would be greatly appreciated. Oh and can anyone tell me what the settings control or where they should be for best spl on the rca side of the amp? One of the pictures is the only semi kinda diagram I could find for roughly what I have.

- Amp RCA side

- Semi kinda diagram

 

nvm Figured it out. Called a friend and he said hook up ch.1 + and ch.2 +. That's how you bridge it, the ch. 2 + will become a ground. Did that and its way better now. He said my amp should've had the diagram on it, but it must've been worn off