Acoustics/formulas/Electro acoustic efficiency

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This formula is a template, for inclusion into pages about Acoustics. Use the following syntax to include it:

{{:Acoustics/formulas/Electro acoustic efficiency}}

$η \approx 1 - \frac{1}{1 + k_{e f f}^{2} Q_{E} Q_{L}} - \frac{1}{1 + \frac{Q_{m 0}}{Q_{L}}}$

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