Acoustics/formulas/Electro acoustic efficiency

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

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

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$\eta \approx 1-{\frac {1}{1+k_{eff}^{2}Q_{E}Q_{L}}}-{\frac {1}{1+{\frac {Q_{m0}}{Q_{L}}}}}$