Stroke Stabilizer
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A speakers surround serves several purposes. It is used to attach the diaphragm to the basket, or frame, and is flexible enough to allow the diaphragm to move in and out according to the input signal. As an integral part of the speakers suspension, it helps control the diaphragm by providing a delicate balance between elasticity and flexibility. It holds the diaphragm in place, centered around the voice coil and within the frame, allows it to move only in a perpendicular orientation, and assures its accurate return to the rest position, without any bounce back.
It also serves to seal the speaker in its enclosure. Any air leaking through the surround, or any other part of the speaker assembly or mount, will adversely effect the enclosure parameters, degrading overall performance. A thin and compliant surround offers quick transient response characteristics, but may also yield to back-pressure in the enclosure resulting in lower output and accuracy. A thick and rigid surround resists back-pressure but also adds weight to the diaphragm, resulting in reduced transient response and control. Sony engineers developed the Stroke Stabilizer to take advantage of the quick transient response and low weight of a thin surround, along with the superior back-pressure resistance of a thick surround. By adding radial ridges of thicker surround material along the surround, the inner side handles the detailed strokes, while the whole surround comes into play during higher power passages. The perfect balance between transient response and back-pressure resistance is achieved, resulting in a speaker that offers high power handling, accuracy over that entire power range, and low distortion. |
