| 摘要 |
A loudspeaker in which the voice coil diameter is so large that the voice coil is axially beneath the suspension roll of the surround. The surround has an overlapping suspension roll such that the inner portion of the surround is coupled to the diaphragm well inward of the bobbin. Such a transducer having greatly extended low frequency abilities by virtue of its wider, softer suspension roll enabling a much lower resonant frequency, and by virtue of its maximum sized magnet and voice coil yielding increased motor strength and power handling. Additionally, the dome diaphragm can now be vented through the portion of the dome that is beneath the surround roll, releasing the trapped back pressure below the diaphragm, thereby further lowering the resonant frequency.
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