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Friday, 18 January 2019
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  Back Loaded Exponential Horn

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.

Lower Cut-Off frequency: 15-8000 Hz: Hz
Throat diameter 2-40 cm: cm
Steps 6-100:  

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Download: Design of a Back Loaded Exponential Horn written by Martin J. King, 04/10/07 PDF, 466kB

Horn Loudspeaker Design Part 1, PDF, 881KB
Horn Loudspeaker Design Part 2, PDF, 1426KB
Horn Loudspeaker Design Part 3, PDF, 971KB