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Manual Denon AVR-770 (page 15 of 83) (English, German)
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Manual Denon AVR-2307 (page 66 of 82) (English)
TOA Electronics, Inc. - 1 kHz Sine Wave Test Tone
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Speaker levels and calibration | AVS Forum
Audio Test Tone
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DSP Test Tone version 1.2 by PatrickDSP on maxforlive.com