Options and upgrades are listed below:

A: (4) M2 8" Marine Speakers, (1) M5 800w 4-Ch Amp ~ B: (4) M2 8" and (2) M2 6.5" Marine Speakers, (1) M2 10" Marine Sub, (1) M5 1,500w 5-Ch Amp ~ C: (6) M2 8" and (2) M2 6.5" Marine Speakers, (2) M2 10" Marine Subs, (2) M5 800w 4-Ch & (1) M5 1000w Mono Amps