Assertion: subwoofer's output | /r/CapableOf | start making many mechanical stress noises
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text: Essentially, it depicts the behavior of the subwoofer reproducing short burst tones at successively louder levels, with each test tone raised by boosting the input gain by 1 dB until either no more output was to be had from the subwoofer or the subwoofer started making too many mechanical stress noises for the tests to be safely continued.