I was wondering if anyone here has ever built their own sub. I am tinkering with the idea and have been on avs and home theater shack trying to learn as much as I can. I was also wondering if you can use different subs together to smooth out response. I would like to build a big boy sub that goes very low. I was also wondering if anyone has ever taken an ep 500 and built a bigger box for it. Would this help it out? Will it help with its extension or will it hurt the amp? If anyone has built one what would you recommend.
7.1 theater room
60 fronts vp180 center 4 qs8's ep500 sub

3.0 tv room
m3's vp150 center