| Behler, G.,
Makarski, M.,
J. Audio Eng. Soc.,
Vol. 51
(2003),
Nr (10),
S. 883-897
Abstract:
A method to measure and describe horn drivers and horns as independent
parts was investigated. It is shown, that the well-known two-port
representation can be adopted for the system characterization
considering certain assumptions and limitations. The horn driver is
represented as a two-port whereas the horn is characterized by its
acoustical input impedance and due to its three-dimensional sound
radiation by it?s on-axis transfer function and a relative directivity.
With both sets of parameters the electrical input impedance, the
transfer function and the directivity of any horn driver - horn
combination can be synthesized by a software tool without the need to
measure the real combination. This method speeds up procedures of
either loudspeaker system design or design and optimization of new horn
drivers and horns respectively. Besides general purpose measuring
techniques some specialized measuring equipment is required like an
impedance tube fitting to the horn throat and an anechoic chamber to
record the directivity of the horn. Finally, all possible combinations
of seven horn drivers and eleven horns have been studied to show the
reliability of the method. |