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Figure 3.
with a flange into which the outer cone and ring fit. In addition there are aluminum protrusions that fit into the holes in the frame to position the speaker. The Dub'l Gone Speaker is held in position by a spring which is placed at the magnet end of the speaker unit and fits into a recession in the back half of the speaker. The advantage of this floating torsional mount is that the speaker-unit frame is protected against warping which would cause the voice coil to drag.
Sound pressure curves show that the spring has no effect on the response. The housing has been designed to be so sturdy that no 4-in. speaker will deliver sufficient power to cause distortion by vibrating the curved back of the case.
Inasmuch as the inner speaker is protected by the second cone, the opening in the front of the speaker case is wide to provide a smooth passage of sound and eliminate muffling. A special drain is provided at the bottom of the flange in the speaker case so that water will run freely in front of the volume control and out of the case.
When the outer cone deteriorates it is easily removed without damaging the inner cone. The manufacturer supplies replacement cones and cork gaskets, together with cement and instructions in a kit. Cement is applied to the outer rim of the inner cone, the new cone put in place and then the gasket cemented to the outer cone.
J. Robert Hoff: Drive-in Speaker
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