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Test Signals for Measuring the Efficiency of Audio Amplifiers

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Measuring audio amplifier efficiency with sine-waves is not representative for use with real audio signals. It is investigated if the IEC-268 test signal, that has the amplitude- and frequency characteristics of audio, is suitable for predicting amplifier efficiency. The dissipation for real audio signal samples never deviate more than 20% from this prediction. An IEC variant is proposed that is more suitable for circuit simulations.

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AES - Audio Engineering Society