Abstract
In this study, the property and the structure of a micro-speaker had been firstly shown to be treated as a ducted speaker-system, which consisted of the unit and the ducted enclosure. With the decrease of total hole area, the resonance frequency of the micro-speaker was decreased due to increasing the stiffness or reducing the compliance. The behavior of resonance frequency relative to the total hole area exactly agreed with that of the square root of compliance. With decreasing the total hole area, the effective chamber volume was increased, but the reference sound pressure level was exponentially reduced in the low and middle frequency range.
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