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Re: No compromises front loaded double 18” cabThe closest I've seen to any "rule of thumb" for estimating the length reduction was from a manufacturer specialising in car audio, they suggested to shorten by 1/2 of the height of the port - eg a 22" wide, 4" tall port would be shortened by 2". I suspect that may still be a little simplistic, though better than nothing.Building a prototype with some facility to get in and cut the port progressively shorter and measuring impedance would be needed to be sure - given your "No Compromises" goal that would seem a worthwhile investment.HTH,David.
Re: No compromises front loaded double 18” cab
The closest I've seen to any "rule of thumb" for estimating the length reduction was from a manufacturer specialising in car audio, they suggested to shorten by 1/2 of the height of the port - eg a 22" wide, 4" tall port would be shortened by 2". I suspect that may still be a little simplistic, though better than nothing.
Building a prototype with some facility to get in and cut the port progressively shorter and measuring impedance would be needed to be sure - given your "No Compromises" goal that would seem a worthwhile investment.
HTH,
David.
