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Showing posts from December, 2014

A brief test on gag effectiveness

I did an initial experiment on gag effectiveness. These are ballpark measures. 1. mouth stuffing I used a flexible sponge in the mouth and a ballgag to seal it. It manages to drop the sound volume by 10 dB. I think that this effect (better than I expected) is solely due to the mouth stuffing, as it reduces the resonance chamber of the mouth/nose cavity and blocks air flow through the mouth. Since the path through the nose is narrower than through an open mouth, there is also less sound waves that can travel through that same path. 2. nose tubes The same setup as as above, but with a cap over the mouth and nose and tubes for breathing. In the experiment, it dropped the volume by 2 dB. This is to be expected. High frequencies may be subdued because they cannot take the bend in the tubes, but low frequencies are not hindered by bends. The slight reduction is probably due to reduction of air flow. However, for a realistic (safe) gag, I should have used wider tubing. So I am e