High Efficiency Speaker Asylum

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RE: What attributes make a driver a good match for a SET?

Posted by Paul Joppa on May 18, 2017 at 10:37:51:
Most tube amplifiers have taps for different speaker impedances. Given that, there is no reason to prefer one impedance over another.

There is a minor consideration, in that some output transformers perform better (have less leakage inductance) on a particular tap. The difference is confined to the very high frequencies, so it is not relevant for a midrange driver. This effect depends on the detailed design of the transformer windings, so only the maker can be more specific.

Other than that, tomservo has addressed the question well. I'll just add that most SETs will have an output resistance between 1/4 and 1/2 of the rated impedance (e.g. 2 to 4 ohms on an 8-ohm tap).