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Re: Basshorn impedance

From Plach "Design Factors in Horn Type Loudspeakers", JAES.

..."The mechanical impedance of a driver is resistive only at its resonant frequency and is highly reactive at any other frequency. If the cutoff frequency of the horn is placed below the unloaded resonance of a driver, the horn reactance is positive and increasing with decreasing frequency while the driver reactance is negative and also increasing with decreasing frequency.

Thus it is possible to make the net mechanical reactance between the horn cutoff and driver resonance close to zero.

The [horn] cutoff frequency is generally chosen as the point where the net mechanical resistance is zero, since in the finite horn the mechanical resistance at and below cutoff is not zero but has a finite value which is a small fraction of the asymptotic value.

This expedient leads to a large efficiency improvement at and near cutoff."

He goes on to say that an annulled driver (i.e., the "consumate match" as described above) is "relatively insensitive to large variations in reactance".

Hence, short horns displaying large variations in reactance resulting from reflections from the mouth can perform quite well when an annulled driver is employed.

That's all I want to type, so there it is...

DM

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