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Max. speaker RMS current at middle frequencies (ca. 300..500Hz) is determined by its power and impedance ratings. The thermal power is given by I² times DCR. So in principle less DCR means less voice coil heating. Same gauge half turns number would meet the 3.2 Ohm DCR requirement for equal thermal power. But this would decrease voice coil volume and surface causing excessive VC temperature, in other words: less power handling.
Also to meet the 50% inductance requirement, turns number must be decreased by only 30%.
This means that wire gauge must be increased to get a DCR of 3.2 Ohm with 70% turns and to get enough voice coil volume and surface.
Most surprisingly my measurement on 16 Ohm and 8 Ohm Celestions confirmed the 2:1 ratio of DCRs but the inductance ratio was only 1.6:1 (@1kHz). This shows that there is some leeway regarding actual number of turns.
Last edited by Helmholtz; 12-03-2018 at 11:07 PM.
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