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It is a 4 channel amp by the way you describe the RCAs in. If the sub is a single voice coil just bridge it to the rear terminals.

If the sub is a dvc you can probably get away with bridging the front on one coil and the rear on the other.

The three 10"s would probably be louder than a single 12 if your powering them correctly. If you dont have enough power chances are a single 12 with the correct power will be louder.

It helps to have all the facts/info first :)

I'd say stick with the three 10's. If you don't think that is loud nuff, consider building your self a ported box. If you need help, someone here would be glad to help. And don't forget. Welcome to car audio central!

I don't think that's a four channel I think that would be a 2 channel. I Have a four channel right here, and it has four terminals for front, and four for the rear "8 hookups total" Anyway, What ohm is the sub and we could help you better. Guessing it is a 4 ohm sub, I would bridge it, if that amp can do it. If not just run it from the one "hookup" - to - and + to + from the sub. If that helps any :)

sorry for the stupid question but nephew has a cheap wave 4300 amp from mobiletec i think but it is a four channel 300 watt amp trying to hook a single pioneer 12" in q logic box should i use front channel or rear or what is the best way to get it to sound good there are 2 hookups for front speakers and 2 for rear also not sure which rca hook ups to use rr and lr or lf and lr any help would be great thanks. alo i have an older kenwood 375 watt amp in a grand cherokee what 12" would sound good i have three 10" in a box should i keep that or can i do better with a single 12 thanks Eric