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Re: I built one of Olson's double horns

Posted by Paul Eizik on May 14, 2003 at 20:12:48:
Hi Bill
For someone with your woodworking skills Harry's horn should be a piece of cake. The only slightly tricky part is the "W" manifold, and if you use the same set up on the table saw to cut the height dimension of the dubya, you're okay. The general size of the double loaded bass horns in my rig is about the size of Tom Brennan's Altec A5's, but W.A.F. "z" is always site specific.
The rear chamber in a double loader is more like the compression chamber in a compression driver in that it is a factor for tuning out a resonance rather than an oportunity to generate a resonance to accomplish something constructive as in the reactance annulling box.
As to the lack of commercial succes of the concept, in the circa 1936 era Western Electric saw their cinema sound monopoly overthrown, and the acension of the Altec monopoly followed which lasted all the way into the 70's when JBL took advantage of a chaotic business situation at Altec. RCA (and Harry's lab) was never able to put much of a dent in any of the various theater sound monopolys, and the various technologies suceeded in the market more for prevailing business reasons than technological advances, as they all had smart people and good ideas. My Dad built several double loaders (direct radiator on the front) and sold some to people in his hi-fi club in the '60's. There was one pair that he did'nt sell, and I got them when he had to clean out his garage in the late 70's. In the late 80's a friend brought over some Spica TC 350's, and I felt challenged to match the imaging I heard...
T'was ever thus!
Paul