Ultra low frequency transducer and loud speaker comprising same
AssigneeStillwater Designs and Audio, Inc.
InventorsSteven M. Irby, William O. Doering
Life of this patent
Estimating the term…
Abstract
An ultra low frequency transducer or subwoofer for automotive speaker systems with a rectangular or square, concave diaphragm. The square periphery preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. In this way, air displacement in the subwoofer is maximized for a given size of enclosure, and thus so is the loudness of the speaker. The transducer typically includes a frame or basket with a square front for supporting the periphery of the diaphragm. The preferred diaphragm includes a convex surround with pleated corners. For increased durability, trusses are formed in the diaphragm.
Claims17
An ultra low frequency transducer comprising:
- a basket having a rectangular front;
- a concave diaphragm with a rectangular periphery sized to be supported in the front of the basket and supported for axial movement;
- and
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil linked to the diaphragm, the voice coil connected to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into reciprocating axial motion of the diaphragm to produce ultra low frequency sounds.
A loud speaker comprising:
- an enclosure having a rectangular opening;
- an ultra low frequency transducer comprising:
- a concave diaphragm with a rectangular periphery about the same size as the rectangular opening of the enclosure, wherein the diaphragm is supported for axial movement inside the enclosure;
- and
- a driver assembly comprising a permanent magnet and a reciprocally supported voice coil linked to the diaphragm, the voice coil connected to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into reciprocating axial motion of the diaphragm to produce ultra low frequency sounds.
The loud speaker of claim 17 wherein the pleats extend outwardly from the surround.
Dependencies are inferred from the claim text.