I want to build a SPL enclosure for a show coming up and wasnt quite sure about size and port. What I was going to build was...

42" x 15" x 10" with a port that was 10" x 4" x 21"

Will this be good ?

The Q is not designed or intended to be an SPL woofer. May want to re-think your woofer selection to a BL or BTL.

Im not out to break records or anything, only 1000 watts on it, I just wanted to build a enclosure for USAC SB 1 show coming up

I just got a box designed by chris @ fishercustoms..

What I learned is:

1. Start with a box that will meet the sub's recommended volume. Net volume must be within 1.8cu ft and 2.5 cu ft. 12-16 sq inches of port area per cu ft. When calculating net volume, make sure to take sub displacement, bracing, and port volume into account. You can use the RE Enclosure Calculator, but take about .2 cu ft off of the volume it gives you for the port and bracing, then another .16 cu ft for the Fi Q.

2. When making the port, being that you want it to be an SPL enclosure, you probably want the port tuned to around 40hz. SQ might not be as great, but SPL will be much greater. Also, remember to keep as close to a 1:8 ratio with the port. So 1" width, per 8" length.

That should get you started, I'm not the most knowledgeable person about this but I did learn a lot about it when designing my box. He had used WinISD to get good measurements, and AutoCAD to draw it out.

If you want, email Chris, [email protected] and for a measly 25 dollars he will do all the work for you, and make the perfect box for that sub, make it sound great, and give you full detailed drawings from autocad. Not to mention he will answer any questions you have.

Hope that helps, and good luck.