Does anyone know about a source for getting a book/plans for an efficient design using a 2" horn (JBL 2446) and a cast frame 15" driver? Possibly would add a 10" making a three way. I would prefer a trap box design with at least 15 degree angles. PS- I plan to build Bill's DR 250/300 in the future, but I have drivers for these now, and would like to use them. Thanks in advance,
Wayne Parham Messages: 18722 Registered: January 2001
Illuminati (33rd Degree)
I'd suggest one of two types, either a DI matched two-way or a three-way with a simple conical midhorn. The advantage of the two-way is simplicity and the advantage of the three-way is reduced bandwidth for each driver. Either will provide uniform coverage if done right, because the two-way is DI matched and the three-way is horn loaded down to a relatively low frequency.
If the woofer is a JBL 2226 or equivalent, which seems to be the popular alignment for 15" pro woofers these days, then you'll want a cabinet between 2.0ft3 and 5.0ft3 tuned to 40Hz. Pick the port with the Helmholtz formula below and you're set.
Wayne: Thanks for the swift reply, and the corresponding formula. I think I will go with the simple two way, as I have both drivers. Forgive my ignorance of mathmatics; what variable( constant?) does 'Ve' represent ? Taylor
Wayne Parham Messages: 18722 Registered: January 2001
Illuminati (33rd Degree)
Ve is enclosure volume. I think you will be very happy with a DI matched two-way loudspeaker. They are simple and work very well, a high-quality solution. It's one of the best design configurations, in my opinion.
Wayne I realized during lunch today, in one of those palm to forehead moments-- V= volume. Not to hard a jump . Thanks again for the advice, and I will be building some newer boxes soon. Taylor
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