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warble tone

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warble tone [′wȯr·bəl ‚tōn]
(acoustics)
A tone whose frequency varies periodically several times per second over a small range; used to prevent standing-wave patterns from forming in reverberation chambers.


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I measured the speaker both in-room and outside using several techniques: near-field bass measurement of the woofer and port, 1-meter frequency response sweeps using 1/12 octave FFT, and warble-tones using sine wave and warble tones measured with a precision SPL meter.
The ITC-6614-DSL Check Mate adds features to any standard test set, including measurement of line voltage, loop current, percentage of battery life left and a warble tone for locating wires.
Since the SubSonic 1 has no claim, I measured its output with a Radio Shack digital SPL meter using the 100Hz 1/3 octave warble tone (-20 dB) on Track 24 of the Stereophile Test CD (STPH 002-2, 1990).
 
 
 
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