Zeph 10+ year member
C eh, N eh, D eh
I just finished making a program for port tuning calculating, ive used jl audio's formula and im pretty sure its accurate, give it a test and lemme know how it is. ive compared it to a couple hand-done calcs and it gives same answer.
http://mikekd0.tripod.com/id10.html
http://mikekd0.tripod.com/id10.html