Sorry for the length, started off as a question, but I thought I would add some background. I am very passionate about sound; I try to follow Tony Andrews
(owner of Funktion One) teachings even if he sounds a bit crazy at times. Knowing what I do now after the past few years, if I had known about Bassboss, I
would have bought a system from them. I have been thinking about building subwoofers for my system for quite some time. My current subwoofers are two B-52
PA18s (that have magically been given a narrower frequency response since I've owned them) powered by one Crown XTI2002 bridged mono @ 4ohm. For tops,
I have 2 X B-52 PA-315s (that have magically been downgraded in "power handling" by b-52 since I've owned them, 650W down to 400W) with a Crown
XTI1002 bridged mono @ 8 ohm for each (running in stereo). The system sounds pretty good overall, but, IMHO the subwoofers are not worth the money I
spent on them. But, it’s what I ended with as my first system. Over the past few years, I now know that 1000W is subjective (to the manufacture) and that
B-52's marketing team must be making some very fat paychecks. First I found out that that I had 2 different drivers in my subwoofer enclosures, one was a
selenium (that I believe was discontinued more than a couple years ago), and the other was a b-52 branded Celestion (FTR18-4080F). Would there be any
adverse effect from having two different drivers in the same box? I thought I was getting something that could handle "1000W" but they both create audible
distortion before the amp even clips and in theory (manufacturer theory) each sub should be getting "1000W." I soon after found out it was because they are
only 600W aes RMS. I'm just now learning how to use limiters to try and keep them happy. I am now curious as to how I can increase my systems low-end
performance and just recently had time to mess with WIN ISD. I plugged the TS parameters for the factory Celestion driver just to see what it would show me
(not fully understanding how to know what it would show me). Then, just for fun, I plugged in the TS parameters for the Celestion FTR18-4080HDX, which is a
1000W aes RMS driver. A mild upgrade in power handling. The pictures below are what I ended up with using the box parameters shown (interior PA18s
dimensions and port size). Yes, from what I have read it is an audio sin to use a pre-existing box and put different drivers in it. Normally you start with a driver
then the box and then power them if I am incorrect please correct me. I would like to use some Faital Pro 18s to build new subs, but when it comes to designing
a box for them I feel as if I am in over my head, and I have not been able to find box designs online for them. I am more than willing to learn. I do own some of
the necessary tools and am willing to buy what I don’t have. I am looking for something no bigger than the exterior dimensions of the bassboss SSP218. Is
subwoofer design modeling software reliable? More specifically, how accurate is WIN ISD compaired to other programs? What other programs are their? What
should I expect from the pictures below? Any questions, comments, tips, suggestions, or point me in the right directions would be greatly appreciated, I am a
sponge and only want to learn more
. I apologize in advance for peppering this paragraph with questions
.