tooloud4tv
10+ year member
CarAudio.com Elite
not impossible just make the front baffle like an V shape u can fit all 4 12's rear firing that way. make 2 baffles 1 baffle that hold 2 12 each. then angle them sort of like the woofers are firing at each other. thats the only way u going to fit 4 12s rear firing. and honestly i love sealed boxes, but u can also get an ported box to sound BETTER! and they can also have flat responses and not have large peaks. if it were me id fire all 4 subs up and have my port facing the rear tuned to 28hz. lower tuning the flater ur response will be majority of the times and will sound **** good too.