Planar Speaker Asylum

Posted by Davey (A) on June 28, 2020 at 10:16:55

In Reply to: RE: Damping posted by neolith on June 27, 2020 at 19:16:59

The output impedance of a tube amp is not 4,8.16 depending upon the settings. :) Those are just transformer taps. The actual output impedance is lower than those numbers.

Using an amplifier with significant output impedance, it's definitely possible to skew speaker frequency response looking into a varying impedance load of many loudspeakers.

The traditional way of defining "damping factor" was to include the speakers DC resistance in the denominator of the calculation. Thus you had a lower number than a simple speaker-impedance divided by amp output resistance calculation.
DF = Speaker impedance / (Amp output impedance + Speaker DC resistance)

Dave.

Edits: 06/28/20

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