Speaker leak test system and method

摘要

A speaker leak test system which quickly tests if a speaker enclosure is sealed properly. The speaker leak test system tests for air leaks in the speaker enclosure, which air leaks degrade the acoustic performance of the speaker. A vacuum (or pressure) source is connected through a vacuum hose to the speaker enclosure and vacuum is drawn. After a test vacuum level is reached, the mass air flow through the vacuum hose is measured. If the mass air flow does not exceed a pre-determined speaker dependent threshold for the speaker under test, the speaker is declared to be leak free. A bypass solenoid may reside in parallel with a mass air flow sensor to reach test vacuum quickly. This speaker leak test system is intended to be used in a prototyping and production environment and tests the speaker enclosure for leaks both quickly (e.g., less than five seconds) and accurately.

主权项

1. A method for measuring speaker enclosure leakage, the method comprising:
positioning a speaker opening of a speaker enclosure against a mating plate; assembling a mass flow sensor and air flow regulator serially in fluid communication between the mating plate and an air flow source; applying a regulated air flow by the air flow source through the mass flow sensor and the air flow regulator to the speaker enclosure under test; regulating the air flow to obtain a test pressure level in the speaker enclosure; measuring the pressure level in the speaker enclosure to obtain a measured pressure level; waiting for the measured pressure level to reach the test pressure level; measuring the mass air flow between the speaker enclosure and the air flow source by the mass flow sensor while maintaining the test pressure level; comparing the mass air flow to a threshold; and if the mass air flow does not exceed a threshold, declaring the speaker enclosure to be leak free.