1. JBL 150 watt amp(75 per channel) powering 2 250 watt MTX 12" roadthunders

2. A rockford fosgate 250 watt amp powering a 500 watt rockford fosgate 15" sub

which will have more boom?

 

The second one will be 100% better by far !

 

Why not both?

 

Second...take it from someone who has went through 3 systems 2 of which had rockford amps

 

why not just get 2 12" punch Z's and a pyramid 1000watt amp off ebay for cheap as hell and it sounds good enough.. i wouldn't want anything louder, sorry guys i don't like to spend thousands of dollars on systems that i will get bored of later on.

 

HAHA You have'nt meet JL AUDIO have you ? Get bored ? I think not !

 

If you want to do ebay there are much better. Even if its a lower power amp than what the pyramid says itll probalby actually do more. You don't have to spend thousands if you know what to look for and what is good quality. Some people think spending thousands on thier engine a wast. Its all realtive.

As for the origonal question it should be easy to swap them out and see which one you like better once you have the wiring in. The 12's will probably be more efficient due to more cone area but if the speaker effecience is less it may be pretty close. box size will also play a roll. Personally id run the single 15. I don't think 75 to a sub is enough.