Any Good Sites For Free Designs? Port Length, Tuning And All That?

[Crump]

I have been using Soundsolutionsaudio, but they won't let me use two ports, i want two but if i have to use one then i will, any sites would be helpfull thank you

[uhoh_45]

http://www.carstereo.com/help/Articles.cfm?id=31

port

box sizing

[Decaf]

amatt85's spreadsheet works great

[AI James]

if you have one port calculated you can easily do the math for 2 on your own