Powered Sub with Amplified Speakers

[RonZwanson]

Hey everyone. This may be a bizarre question, and I did search here and on Google. I came up with nothing, likely because it's such a weird, specific search. So, if anyone knows of any resources, please send them my way. I'd appreciate it. Anyway, on to the question:

Right now, I've got a bazooka powered sub and some Infinity Kappas running right off my head unit. I had informal plans to some day add an amplifier to my speakers. They're pretty good off of the head unit, but I know what a difference an amp makes. (I used to work in the audio field. That being said, lay off the "bazooka subs suck" comments. I just wanted something I could hide.)

So, the last few weeks I noticed my driver side woofer is cutting in and out. It drives me nuts. I figured, "Well, if I'm gonna have to crack it open and check the connections, that's as good a time as any to add a proper amp."

The snag: I've got the power cable coming from the battery to the amp in the sub. Do I need to just run the power to a distributor cap, then split it between the two amps? The wire gauge for the amp is fairly small (I think 12 gauge), so I don't think that'd be safe for that kind of load. Should I put a heavier cable to the distributor cap, and send the same or smaller to the amps? The sub also comes with a proprietary wiring harness connector. If anyone has worked with bazookas before and knows how to use an aftermarket power connection, please share. I'd like to set this up so that it's effective and safe. I'd rather not burst into flames on the way to work...

If anyone has done this type of set up or is familiar with this situation and has input, I'd appreciate it.