File:Gunness 4-way compression driver manifold, 1984.jpg
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Gunness_4-way_compression_driver_manifold,_1984.jpg (248 × 245 pixels, file size: 15 KB, MIME type: image/jpeg)
Summary
| Media data and Non-free use rationale | |
|---|---|
| Description | Patent drawing of a 4-way manifold combining the outputs of four compression drivers to one horn loudspeaker. Invented by David Gunness in 1984, the patent assigned to Electro-Voice. This manifold was employed in the Electro-Voice MT-4 concert loudspeaker system. |
| Author or copyright owner |
David Gunness |
| Source (WP:NFCC#4) | Original publication: US patent filed November 15, 1985, awarded December 16, 1986. Immediate source: http://fulcrum-acoustic.com/wordpress/wp-content/uploads/2008/03/loudspeaker-manifolds-for-high-level-concert-sound-reinforcement-1986.pdf |
| Use in article (WP:NFCC#7) | David Gunness |
| Purpose of use in article (WP:NFCC#8) | The image will show the reader the complex arrangement of vertices, faces and angles that are integral to the understanding of the manifold invention patent. |
| Not replaceable with free media because (WP:NFCC#1) |
The inventor of the device has moved on from his association with Electro-Voice, the assignee of the patent. The patent itself has expired; it is no longer supported by any entity who would care to redraw or photograph the device. |
| Minimal use (WP:NFCC#3) | The image is used in only one article. The article has only one non-free image. The image is small, being reduced in size from the original. |
| Respect for commercial opportunities (WP:NFCC#2) |
The loudspeaker in question, the MT-4 concert system, was prominent in the late 1980s and throughout the 1990s, but it is no longer being made, sold or supported. |
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:11, 6 August 2023 | | 248 × 245 (15 KB) | Thales (talk | contribs) |
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