Wayne Parham Messages: 18709 Registered: January 2001
Illuminati (33rd Degree)
The Zmax figure of 50 ohms commonly mentioned is actually pretty low. That's good, because it means load impedance doesn't fluctuate very much. It's not uncommon to see speakers with a peak impedance over 150 ohms. Cabinet tuning and configuration modifies impedance too, so the 50 ohms Zmax figure is to be seen as a rough guideline. It is a safe bet that a speaker with steady impedance when measured in free air will present a pretty constant load when further damped by the cabinet.
Many Altec woofers have very high peak impedance but they were used mostly with fairly powerful push-pull amps. Not many theaters used low power SET amps; That's more of a recent trend. And the Paramours are a SET amp, but they use a parafeed output circuit and are very insensitive to load. As long as the speakers are fairly efficient, they'll work pretty well on Paramours; I rarely hear people complain about low bass on this amp regardless of speaker impedance.
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