The KleinHorn Part 1 and Part 2 by Nelson Pass
A horn is an acoustic transformer, changing high pressure and low volume at the throat
to low pressure and high volume at the mouth. It does so by slowly expanding the cross
section of the tube down which the sound wave travels, and it creates an acoustic load
for the driver as if it had a very large diaphragm, dramatically raising its efficiency.
A horn loudspeaker is characterized by several numbers; the area of the small end
known as the throat, the wide end known as the mouth, the distance from the throat
traveling down the length of the horn toward the mouth, and the expansion curve of the
cross section of the horn as you travel that distance. In an exponential horn, this
expansion is given by the initial throat area multiplied by the natural logarithm e raised
by a power factor related to the distance down the horn and the lowest frequency we
want to work at. |
Download: Design of a Back Loaded Exponential Horn written by Martin J. King, 04/10/07 PDF, 466kB
|
|
 |
|
|
Back Loaded Exponential Horn