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Re: Basshorn impedance

Frequency response is another issue entirely. A speaker at resonance is resistive, and that indicates something about how it will behave. It may have flat response through that range, or it may not.

Back to the subject of impedance, one finds that it is higher at resonance. The impedance peaks of a basshorn indicate standing wave resonant behavior, much like a quarter wave pipe. The fact that there are several peaks shows that the device has large swings in its reactive phase angle. It is only resistive at the impedance peaks, and at relatively high frequency where the horn becomes resistive over a wider band.

In the example shown earlier, the horn becomes reasonably unifomly resistive above about 200Hz. That's higher frequency than the basshorn is likely used, but it does show that the horn becomes more resistive at a frequency where its size is large compared to the wavelengths presented to it, nearing the top of the passband.

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