hello, i want to buld a aperiodic bi-chamber for a 12 or two. i cant seem to find much info on the internet on how to design one and get the mesurments. any info you guys (and gals) could give me would be great. i have the ability to build them i have built many many boxes sealed and ported and want to take a wack at a aperiodic bi-chamber. well thanks in advance.