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What does VVV stand for?

VVV stands for variable venting valves

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Variable Venting Valve for Earmolds Abstract The frequency response and loudness reduction characteristics of earmolds with variable venting valves (VVV) were investigated. Both side-branch and laterally vented earmolds were employed. Sound pressures were measured at 44 frequencies from 100 to 4 000 Hz in a modified HA-2 coupler with the VVV in four stages of opening: closed; ? open; ? open and 3/3 open The effect of venting is primarily in the low frequencies.
The frequency response and loudness reduction characteristics of earmolds with variable venting valves (VVV) were investigated. Both side-branch and laterally vented earmolds were employed. Sound pressures were measured at 44 frequencies from 100 to 4 000 HZ in a modified HA-2 coupler with the VVV in four stages of opening: closed; 1/3 open; 2/3 open and 3/3 open. The effect of venting is primarily in the low frequencies.