Resistors vs.peltz Autoformer- Differences


I just got an email from Zu.
They offer resistors for their speakers that will lower/raise impedance so that amps will have an easier time driving them.
What is the difference between using a resistor and using an Autoformer, like the Paul Speltz? Both seem to be doing the same thing.
Bob
gdnrbob

Showing 1 response by kalali

Aside from the load impedance, wouldn’t adding a resistor in series with speaker driver affect the high frequency response of the driver, particularly in case of a single driver or a tweeter?