{"id":2206,"date":"2015-07-21T08:43:21","date_gmt":"2015-07-21T06:43:21","guid":{"rendered":"http:\/\/2016.carlssonplanet.com\/en\/?page_id=2206"},"modified":"2015-10-04T15:23:07","modified_gmt":"2015-10-04T13:23:07","slug":"oa-1","status":"publish","type":"page","link":"https:\/\/carlssonplanet.com\/en\/speakers\/not-produced\/oa-1\/","title":{"rendered":"OA-1"},"content":{"rendered":"

“OA-1” Omni directional loudspeaker for mounting on a wall<\/strong><\/p>\n

\"Click<\/a><\/strong><\/p>\n

A wall mounted omni directional bass reflex speaker using a full range driver. This design has never been put in production. The design principles are similar to the ones used for the Coalscuttle (Kolboxen). The speaker uses one full range driver firing upwards into a cone distributing the higher frequencies.<\/p>\n

The design idea<\/strong>
\nThe general object is to give optimum projection of the audio spectrum in the listening room Design goals:
\n1. Generating enough acoustic power without distortion
\n2. Generated acoustic power distributed evenly to the listeners in the room, which is difficult at low and high frequencies
\n3. Obtaining the above two in an enclosure that is not bulky by using the characteristics of the room efficiently.
\nAlso to increase the acoustic efficiency at low frequencies<\/p>\n

Measures, estimated<\/strong>
\nBox height 28cm
\nDiameter 31 cm
\nBass reflex tube length 13 cm
\nBass reflex tube diameter 8 cm
\nCone diameter 27 cm
\nCone height 19 cm
\nSupports for cone 19 cm
\nVolume 15 – 20 litres
\nDistance to wall 19 cm<\/p>\n

Drive units, estimated<\/strong>
\nFull range unit: Most likely the Philips 9710<\/p>\n

Crossovers<\/strong>
\nNone<\/p>\n

Explanations to figure<\/strong>
\n10. Cylindrical casing
\n11. Baffle
\n12. Bottom
\n13. Loudspeaker opening
\n14. Reflector
\n15. Rods
\n16. Bass reflex port
\n17. Bass reflex tube, integrated in the wall bracket
\n18. Wall<\/p>\n

The cone (reflector) placed above the upwards firing loudspeaker is a device that is used in todays advanced products. Bang & Olufsen uses a lens in their Beolab speakers and Mirage also uses this technique in their speakers. Stig Carlsson did this in the fifties, well ahead of the competion.<\/p>\n

Written by Martin Dellstig<\/p>\n","protected":false},"excerpt":{"rendered":"

“OA-1” Omni directional loudspeaker for mounting on a wall A wall mounted omni directional bass reflex speaker using a full range driver. This design has never been put in production. The design principles are similar to the ones used for the Coalscuttle (Kolboxen). The speaker uses one full range driver firing upwards into a cone […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1934,"menu_order":2,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2206","page","type-page","status-publish","hentry"],"yoast_head":"\nOA-1 - CarlssonPlanet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/carlssonplanet.com\/en\/speakers\/not-produced\/oa-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OA-1 - CarlssonPlanet\" \/>\n<meta property=\"og:description\" content=\"“OA-1” Omni directional loudspeaker for mounting on a wall A wall mounted omni directional bass reflex speaker using a full range driver. This design has never been put in production. 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