An overhung voice coil is a type of loudspeaker driver design where the winding height of the voice coil is longer than the height of the magnetic gap in which it operates. In this design, the coil extends beyond the magnetic gap, giving it a longer excursion capability than a standard driver.
Pros of Overhung Voice Coils:
- Greater Excursion Capability: Overhung voice coils have a longer excursion range, allowing them to move the speaker cone farther in both directions. This increased excursion capability enables the driver to produce louder sound levels and handle more powerful low frequency signals.
- Enhanced Low Frequency Response: The larger excursion of overhung voice coils contributes to improved low frequency response, allowing for deeper and more impactful low frequency reproduction.
- Higher Power Handling: Due to the larger size and mass of the coil, overhung drivers can often handle higher power levels without reaching their physical limits.
- Increased Nonlinear Distortion: The extended excursion of the voice coil can lead to higher levels of nonlinear distortion, especially at large excursions where the magnetic field becomes less linear.
- Reduced Control and Linearity: Overhung voice coils may exhibit slightly reduced control and linearity compared to underhung designs, leading to potential distortions at extreme excursion levels.
- Higher Heat Generation: The larger voice coil excursion in overhung designs can lead to increased heat generation during operation, potentially impacting power handling and thermal stability.
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