John,
I was trying to get a powered sub system. The QSC HPR sounded great in the store and its a great sub but its too pricey to expand, I figure I need about 4 of those. So I decided upon B&C SUB215.
I chose 215 cause the specs are pretty good. I would really like to hear what 134db long term sounds like. I built a lab sub before but its not practical, cant put that in my house. Play it with a 60 RMS amp and the neighbors complain
. Plus I like the sound of front loaded subs. I will be taking that apart to use the drivers in 2 sealed boxes.
I am getting two yamaha p5000s amps to push each sub. That should be sufficient. QSC is simply too pricey, plus I think Yamaha quality is right up there with QSC.
I still didnt start building them, I just got the wood.
Oh on inches and mm, I converted everything to mm to make it simple to use teh plans. Dont try to conver it to inches, it will be nuts. Plywood is 18 mm thick, just need to make minor adjustments like at teh port to keep it at 2 inches.