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Google "damping factor"

Direct from the web: "Technically, the damping factor is the specified load impedance (in use, that'd be the speaker system) divided by the amplifier's output impedance."

Damping factor is not independent of the load impedance. The load impedance = the speaker resistance at any given frequency. Thus since all speakers present a reactive load, damping factor is not independent of frequency, either. Most manufacturers will stipulate damping factor into an 8-ohm load, and few bother to tell you at what frequency, but 1kHz is a good guess. Anyway, the advertised damping factor of your amplifiers is likely to be incorrect for driving your Apogee ribbons, which have an impedance way lower than 8 ohms.


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