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  1. Wayne A. Pflughaupt

    Efficiency of older speakers

    We aim to please! :D Regards, Wayne A. Pflughaupt
  2. Wayne A. Pflughaupt

    Efficiency of older speakers

    It’s for moments like this that I keep my old Audio Annual Equipment Directories around! From the 1987 edition: Infinity SM 100 (I assume that’s the one?): Frequency response, 35-27kHz (no ± given), Sensitivity, 98dB SPL (1 meter, 1 watt), Minimum power 10 watts, Nominal impedance 8 ohms...
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