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

The issue with SET's so far as the driver is concerned is that the bass response and to a degree elsewhere is adversely effected by having a significant "source impedance". That source impedance varies from model to model etc. In that way, the variable impedance can cause issues like it does with text book passive crossovers.
While SS and closed loop tube amps have a low output impedance and so are effectively a Voltage source, the Voltage at the speaker terminals will go up and down with frequency, changing the normal frequency response if there is a significant impedance in series. Where the loudspeaker has a low impedance, that will have reduced output, where there is a bump in the load impedance, there will be a rise in output, compared to Voltage driven.

What your would want then is an efficient speaker with the flattest impedance curve you can find -or- find an efficient speaker, measure it on your amplifier outdoors (no room effects) and eq it flat, then move inside -or- using software, design a conjugating network that tames the impedance while minimizing the sensitivity loss.

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