| High-Fidelity Uniform-Directivity Loudspeakers Whitepaper [message #65448] |
Wed, 29 December 2010 16:56 |
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Wayne Parham
Messages: 18785
Registered: January 2001
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Illuminati (33rd Degree) |
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I've written a whitepaper on waveguides and constant directivity loudspeakers available at the link below. Seems like I've often gotten the same questions and comments over the years, and I've tended to reply with a list of links to documents and messageboard threads. There were about a dozen posts that sort of covered the main concepts, so I usually referenced them. Basically, this whitepaper is a compilation of each of those in one document.
Topics discussed:
- History of horns, constant-directivity and waveguides
- Evolution of directivity control features
- Introduction of the matched-directivity two-way loudspeaker and the constant-directivity cornerhorn
- Crossover considerations for constant directivity: top-octave compensation, bottom-shelf damping and SPL matching
- Reasons for needing top-octave compensation, and the reasons for differences in specific implementations
- Matching the horizontal coverage patterns and using the crossover and driver positions to shape the forward lobe
- Horn throat diffraction, mouth diffraction and cabinet edge diffraction
- Baffle influence on directivity, aka baffle step
- Room modes and floor bounce
- Multisubs
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