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I'm currently working on my first speaker design. I've read Speaker Building 201 and done quite a bit of research, including playing with with some of the different design packages. I've come across one thing that puzzles me. When I use Alden's formulas for an ideal ported enclosure with a certain set of T/S parameters I get a 19L Vb and a 44hz Fb. Alden then describes increasing Vb to design for a Quasi-Butterworth alignment. However, when I use different box software such a WinISD and select a Quasi-Butterworth I get a smaller Vb of about 15.5L and Fb of 46hz.
Am I missunderstanding something or did Alden misspeak. If WinISD is correct then a QB alignment would have a lower Vb, slightly higher Fb, and provide slightly flatter response than the ideal, but not reach quite as low.
Any help in understanding the different alignments would be greatly appreciated.
Am I missunderstanding something or did Alden misspeak. If WinISD is correct then a QB alignment would have a lower Vb, slightly higher Fb, and provide slightly flatter response than the ideal, but not reach quite as low.
Any help in understanding the different alignments would be greatly appreciated.