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In Reply to: RE: Questions about speaker cable characteristic impedance posted by MP on October 02, 2023 at 11:56:15
In a calculation like this the output impedance of the source really isn't relevant- its the impedance of the load. If it does not match the the CI of the cable, energy can be reflected.
At audio frequencies and speaker impedances, one would think this energy to be minimal (and not to be confused with back EMF). However, tests we did about 40 years ago (the 80s) seemed to suggest that the effect was more profound than we had imagined. But to be clear, these days I've been thinking that some variables were not controlled.
At any rate no speaker, in particular an ESL, has a flat impedance curve such that it would properly terminate a cable's CI at all frequencies.
Follow Ups:
Ralph, thank you for the explanation.
Do I understand correctly that at least in theory, ideally, speaker cable CI should be equal or less than the partner speakers lowest impedance?
.
whereas Characteristic Impedance for a cable is a constant. So, on balance, is one best off using a cable that has a CI lower than the low end of the speakers impedance, or what? Many years ago, after auditioning speaker cables with high CI (e.g., Nordost) and low CI (e.g., Goertz ribbons), it was plain to me that low CI cables sounded best with my Atma-sphere amplifiers driving Sound Lab speakers. In fact, there was no contest. Nordost sounded awful.
-
NT
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