Hello,
I am working on plans for a Fender Dual Showman style of cabinet for two JBL E145, and plan to add PVC tube ports. I am estimating the box will be about 7 cu. ft. I am guessing that four 4" dia PVC ports (maybe four 6" dia) are possible.
(I figure probably a QB3 alignment, but I could be talked out of it. This is for bass guitar, including 5-string.)
Unfortunately many of the free vented box calculators I have found seem to be for single drivers, or are not set to predict response for various porting schemes and a fixed Vb. Any recommendations?
Thanks,
Izzy