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Mms is a Thiele/Small parameter that quantifies the mass of the loudspeaker's diaphragm and other associated components that move during the reproduction of sound. The moving mass of a loudspeaker is an important parameter that affects its overall performance in several ways:
- Resonant frequency: Mms is a key factor in determining the loudspeaker's resonant frequency (Fs). The relationship between Mms and Fs is governed by the equation Fs = 1/(2π√(Cms*Mms)), where Cms represents the compliance of the suspension system. A lower Mms value typically results in a higher resonant frequency, meaning the loudspeaker is more responsive to higher frequencies. Conversely, a higher Mms value tends to lower the resonant frequency, making the loudspeaker more suitable for reproducing lower frequencies.
- Suspension compliance: The moving mass is intricately connected to the compliance of the loudspeaker's suspension system. Compliance describes the stiffness of the suspension and its ability to restore the diaphragm to its resting position after being displaced. The moving mass influences the compliance, and together, they affect the loudspeaker's ability to accurately follow the audio signal and reproduce sound with minimal distortion.
- Efficiency and acceleration: The moving mass plays a role in determining the loudspeaker's efficiency and acceleration capabilities. A lower moving mass allows for greater efficiency and faster response to audio signals, as less energy is required to move the diaphragm. This can result in improved transient response and overall system performance.
- Motor design and control: The moving mass is a consideration in the design of the loudspeaker's motor system, which includes the voice coil, magnet, and motor structure. The motor system must be designed to provide sufficient driving force to move the diaphragm efficiently, while also controlling the mass effectively to minimize distortion and optimize performance.
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