Yep, on the headunit's wiring harness there should be a blue wire(i think) that is your amp remote wire. This wire just simply runs from your head unit to your amp which also has a wiring harness. There is a big difference between the words "bridged" and "ohms". First of all bridged means that by using two channels of a amp and joining them together(bridging) you can therefor double the out put of that channel. This is the best if you want to run subs because they need a lot of power running to them. "Ohms" is the impedence of a speaker. Most speakers are 4 ohm and are very stable at this impedence. Some speakers are manufactured so that they can be run at 2 ohms because when a amp is run in 2 ohm mode, it's output is doubled. eg. a channel running 200W in 4ohm mode can run 400W in 2ohm mode. The downfall of running speakers that have a 2ohm impedence is that if your running a cheap low class amp, it's very stressful for it and my blow it. There is heaps that I could say about ohms and if you want me to elaborate I will but I think that your subs would most likely run in 4ohm mode(mine do).