3C50.55 - Noise Generator and Filters
The filters fit over the speaker and will eliminate certain frequencies when the unit is used as a noise generator.
- Ron Hipschman, "Vocal Vowels", Exploratorium Cookbook III, p. 194.1 - 194.5.
- Richard Berg, "Another Resonance Tube Demonstration", PIRA News, Vol. 8, No. 3, p. 32.
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