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Raw tone is fed into faulty or worn out speaker playing 100 hertz sine wave, total failure at volume 1.
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1:00
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LFE test tone ,oscillator 100hz, 60 seconds, 12db
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1:00
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Test tone, filtered noise, 100hz, 60 seconds, 0db loop
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1:00
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Test tone, filtered noise, 100hz, 60 seconds -18db loop
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