Horn speaker in wall installation details in AutoCAD, dwg file.

<p>This Architectural Drawing is AutoCAD 2d drawing of Horn speaker in wall installation details in AutoCAD, dwg file. <strong>By using a flared transmission channel (a horn) the effective radiating area of the source of sound can be increased to that of the mouth, thus creating greater air coupling (louder sound)</strong>. Because of the gradual change of the diameter of a horn, the source of sound at the throat engages all the air in a horn.</p>