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Gonna be around 4-4.5 feet. I still have to extrapolate parameters.Why is it that your subs are on the very small side as far as enclosure recommendations? almost half what most companies recommend for similar woofers. Just curiosity.Great research and ingenuity Proper engineering and execution. The drivers had to goals. 1st work in small boxes with my desired response, which is number 2. Destroy the lows. Anyone worth their salt can create a driver especially a subwoofer with what they think will be a flat response. This is what we are after but it's not that simple. Back to the small enclosure, very simple physics. You need x amount of force to get x amount of mass moving in x amount of volume. This is simply calculated with FEA programs. Now back on the response part. Everyone gives out specs with boxes that show an awesome flat response on paper. But we don't listen to anything in anechoic chambers. We listen to our sound in vehicles right? And vehicles have cabin gain which gives boost normally in the mid 40's region. To help better explain where I'm going with this here is an analogy. If you install a set of highs and you crank it up and the mids sound noticeably louder than the tweeter you can do two things to fix it. One you can adjust the crossover to remove boost form the tweeter or you can boost the mid to the level of the tweeter to make everything match up. Because we can't adjust the boost down in the bass frequencies caused by transfer function which is normally 5-10 db around 45 hertz we do what we can, which is boost the frequencies from 25-35 hertz. This gets you pretty close to a netted flat response in a vehicle even though on paper my recommended boxes shows a large peak in response around tuning and flat everywhere else. This is the key to why you hear people say it slams both low and high frequencies better than most other drivers they have heard and not just hits the lows of just upper frequencies. Another thing to note is I use large signal parameters to design drivers. To those that have heard my drivers would it shock you to know that the small signal FS of the Ethos 15 is nearly 48 hertz? The most important aspect to my sub design is Pat Turnmire and Enrique Stiles. They are hands down, no questions asked, two of if not the best set of engineers in the world.

http://www.youtube.com/watch?v=UiJBxlMSq44

Gonna be around 4-4.5 feet. I still have to extrapolate parameters.If i can get a job i may sell my zcon and get one of these, if they only need 4-4.5 cubes

cool

Awesome Vid

Gonna be around 4-4.5 feet. I still have to extrapolate parameters. 4 would be nice! Maybe be able to sqeeze one in the trunk depending on port area.If so I will be selling my icons and box.

go all crazy Q and make a 21

for 1 or both?? I would say a 5500 would work good for 1 of them but can take a lot more for both