Posted by Wayne Parham [ 65.214.102.163 ] on March 07, 2007 at 11:19:28:
This post doesn't contain blueprints or even a mock-up, but it does describe the new 10π basshorn in sufficient detail to build one. It's basically a 12π basshorn sub cut right down the center. The idea is to use 10π basshorns in pairs, and it makes transport easier. The 12π is the best basshorn subwoofer in the world, in my opinion, but it is quite large. The 10π is easier to truck around, at 45 x 45 x 15 and less than 150 pounds.
I have toyed with the idea of making a smaller basshorn for quite some time. When I designed the 12π, I planned to build a scaled down version with higher cutoff. I've always had a philosophical problem with undersized basshorns, those that display peaks and dips in response. However, there is some merit in the idea of making a basshorn that is designed to be used in groups in order to get the desired performance.
The idea occured to me that I could pretty much just cut a 12π in half, and each side would be much easier to carry than one large box. A half a 12π is called a 10π, which can be used individually but is designed to be used in pairs. Of course, this means that there is actually a 10π-A and a 10π-B, with the "A" version having the cone facing the front chamber and the "B" version having the magnet facing the front chamber. The cooling plugs and heat plate access panels are also on different sides, so that a pair of 10π basshorns can be stood together to form the equivalent of a 12π basshorn subwoofer.
I would recommend the original 12π be used where possible, because the cancellation of harmonic distortion in the combined throat will be better than the cancellation that occurs from summing at the mouth. I cannot tell how much better the distortion of the 12π basshorn is compared to a pair of 10π basshorns from simulations, because I don't have software tools that can model this sort of thing. That will have to be determined by measurements. A single 10π horn, without a complementary pair, becomes a traditional basshorn. When a complementary pair is used, it gains the benefit of push-pull drive. I plan to assemble a pair of 10π prototypes by the 2007 Prosound Shootout.
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