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Re: Basshorn impedance

I think we might be talking about two slightly different things here. A pure horn, or at least what I and some others might define as a "pure horn", is one that has a basic flare driven by a diaphragm. It's a simple device, with characteristics determined by its properties. One of those characteritics is bandwidth, another is impedance, another still is efficiency, and so on.

There are other acoustic devices besides horns that can be employed to modify the horn's characteristics somewhat. Resonators (be they Helmholtz chambers or standing wave reflectors) can be employed to cancel modes formed by the main horn. The rear chamber can be tuned in a similar fashion. Likewise, electrical devices can also be employed, things like notch filters, compensation networks, and so on. These acoustic and electrical filters can be used to extend bandwidth, reduce impedance peaks and smooth response.


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