Marvel Posted September 21, 2012 Share Posted September 21, 2012 I saved this from somewhere about 4 years ago. Pretty interesting, and I really wonder how they get the claimed response to 2k Hz. Bruce US3912866.pdf Quote Link to comment Share on other sites More sharing options...
Exponential Posted September 21, 2012 Share Posted September 21, 2012 That's not a compression horn, there is no throat or aperture. Just because something is patented, doesn't mean it works. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted September 21, 2012 Share Posted September 21, 2012 I would probally make the lnes a creater shape instead of a pionted mountain. Crater shape would fit better with a domed woofer. maybe I should patent that variation. Quote Link to comment Share on other sites More sharing options...
djk Posted September 22, 2012 Share Posted September 22, 2012 "That's not a compression horn, there is no throat or aperture. Just because something is patented, doesn't mean it works." Really? The cone works against an exit area smaller than its cone area, that's compression. Item #32 in the patent is the phase plug for the driver. This design is a varient of an old RCA design from the 30s. SHOWCO was doing major groups from the 60s forward (LedZep, Spencer Davis, etc), and was in competition with Clair Brothers. They merged in 2000 and changed their name to CLAIR. Getting to 2Khz is tough in a cone-driven horn, it takes careful design, the right driver (Showco used the JBL E120), and some EQ. A Showco hi-fi speaker (with the Pyramid removed) showing the area the cone fires into. An RCA Twin Power loudspeaker from the 30s. This used an 18 under the pyramid and had the HF horn/driver mounted in the apex of the pyramid. First used in 1939, 50hz~11Khz, 18" woofer and 3" coil compression drive with 650hz crossover. Quote Link to comment Share on other sites More sharing options...
mustang guy Posted September 22, 2012 Share Posted September 22, 2012 You're the man. Those are some cool pics. Love to have a set of those! Quote Link to comment Share on other sites More sharing options...
artarama Posted September 29, 2012 Share Posted September 29, 2012 The cone works against an exit area smaller than its cone area, that's compression. Item #32 in the patent is the phase plug for the driver. This design is a varient of an old RCA design from the 30s. Good info djk. they look like a jet engine. So, the smaller outlet causing compression is that what they were calling a "phase plug? Quote Link to comment Share on other sites More sharing options...
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