Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
Sorry, I can't imagine that I would have overlooked a question about impedance, but I've been very busy and maybe I forgot. There have been several discussions about this in the past, so the archives are rich with information about it. But in a nutshell, the Theater four π has the flattest impedance curve, followed by the Professional Series four π and then the Stage four π. As for the amp, it depends a lot on the output circuit, not just the tube. Some 2A3 amps will drive any model of π Speaker without problems, others are more sensitive to the load.
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