Serious confusion!!!

[Spud2388 10+ year member]

Ok, me and my friend are putting my old system in his 2000 Explorer with stock cd player. We ran the power and ground wires, got those hooked up, got the subs in and the amp in place. Since he has the stock radio, we put in a LOC right before his stock sub. The LOC only has one RCA out, and we're hooking it up to a 4 channel amp. Do we need to get a RCA spliter and another set of RCAs to hook up to the amp, or is it possible to bridge a 4 channel amp to 2 mono channels with one set of RCAs?

Another problem we have encountered is that the left sub plays more than the right sub. They are both wired up correct (to 4 ohms) and hooked up correct on the amp. The gains are even on the amp as well as the gains on the LOC. What could be causing this?

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[Spud2388 10+ year member]

beofre, I had channels 1/2 bridged and had one side of the rca going to channel 1 and then I had channels 3/4 bridged and had the other side of the rca going to it. Could that be why one sub moved more than the other, or would that go back to the LOC not being wired up right?