Suggestions on how to wire 2 kicker S12L74 to 1 or 2 Kicker ZX1500.1 amps?

Question

What setup is the best and loudest?

Answer 1

inside your box run a wire from the neg-  of one speaker to the positive on the other speaker. then you are left with a positive on one speaker and a negative on the other, run the positive to the amp and hook it up on the outer positive terminal, then run the negative to the outer negative terminal, (bridged position) this is called a parallel