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namespace:use_of_absorptive_materials_in_loudspeaker [2025/12/10 23:34] – timnamespace:use_of_absorptive_materials_in_loudspeaker [2025/12/10 23:39] (current) – tim
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 ====== Use of Absorptive Materials in Loudspeakers ====== ====== Use of Absorptive Materials in Loudspeakers ======
  
-1. The Case of Loading a Dome Midrange into a Large Waveguide.+1. The Case of Loading a Dome Midrange (and maybe some woofers too) into a Large Waveguide.
  
 I have been recently thinking about and experimenting a little with this project. One problem I immediately encountered is that the acoustic center of a dome is up toward the center of the dome. If the dome is placed in a waveguide so that the top of the dome is protruding inside the waveguide to some degree, as is typically seen in many studio monitors with waveguides, the sound radiating from the center of the dome will cause reflections off the sides of the waveguide at higher frequencies, which destroys the desired constant directivity that the waveguide is meant to provide. This means that the dome must be moved back so that the sound waves that enter the throat are all perpendicular to the sides of the waveguide. But how do studio monitors get away with it and still show smooth dispersion? The answer is somewhat complex, but generally they use very shallow waveguides, and sometimes some complex shaped items in front of the tweeter to better facilitate spherical wave entry into the waveguide. They may also use other tricks with the precise shape of the dome.  I have been recently thinking about and experimenting a little with this project. One problem I immediately encountered is that the acoustic center of a dome is up toward the center of the dome. If the dome is placed in a waveguide so that the top of the dome is protruding inside the waveguide to some degree, as is typically seen in many studio monitors with waveguides, the sound radiating from the center of the dome will cause reflections off the sides of the waveguide at higher frequencies, which destroys the desired constant directivity that the waveguide is meant to provide. This means that the dome must be moved back so that the sound waves that enter the throat are all perpendicular to the sides of the waveguide. But how do studio monitors get away with it and still show smooth dispersion? The answer is somewhat complex, but generally they use very shallow waveguides, and sometimes some complex shaped items in front of the tweeter to better facilitate spherical wave entry into the waveguide. They may also use other tricks with the precise shape of the dome. 
namespace/use_of_absorptive_materials_in_loudspeaker.1765409692.txt.gz · Last modified: by tim