Back in the day, I was all about obtaining the formulae for the boxes mostly known at that time and converting them to usable BASIC programs. This was back before the interwebs and I don’t remember where most came from, but they have been saved since. All are based on the basic “optimum” design via the T/S parameters.

Anyway, BandPass is one that is within my repository. All you need is the driver Fs, Vas, Qts, port diameter, and then your low end cutoff desired for the box. It will give you the front and back box sizes, the port length, and the low to high bandpass frequency points.

Shout out some drivers and I’ll run them out for you. Just let me know how thick the baffle will be where the port will be mounted (front box).

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