tag:blogger.com,1999:blog-8689487740107692135.post5585404397518170189..comments2024-01-15T04:39:32.375-08:00Comments on Red Spade Audio: S3 progressPaul Spencerhttp://www.blogger.com/profile/07514836858344391753noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-8689487740107692135.post-29171771756510594012012-09-30T22:47:49.910-07:002012-09-30T22:47:49.910-07:00I should also mention that this is not the final d...I should also mention that this is not the final design, but one iteration of many that didn't meet every design goal.Paul Spencerhttps://www.blogger.com/profile/07514836858344391753noreply@blogger.comtag:blogger.com,1999:blog-8689487740107692135.post-6433341201968848862012-09-30T18:40:41.120-07:002012-09-30T18:40:41.120-07:00The OS profile was made popular by Geddes but he d...The OS profile was made popular by Geddes but he doesn't actually own it as such, although I did come across a patent of his for applying it to an elliptical cross section. <br /><br />This isn't quite as unique as you think. There is some similarity with JBL progressive transition waveguides although some of them appear to use diffraction around the throat, which I have avoided. The work of DB Keele also comes into it with his CE horn which joins an exponential throat to a conical mid section with an added mouth flare. However, the CE horn is narrow coverage vertically and a different profile with pretty major pattern flip. I've used the same profile vertically and in this design, being multiway there is no need to get a single driver to run so low. So the longer expo throat becomes undesirable and in this design it would make crossover work more difficult. <br /><br />Essentially I've had to come up with a new throat that is unique but not without similarity to what others have done. <br /><br />This isn't an OS profile. This design transitions a little more gradually from the exit angle to the coverage angle. I've also changed the design since the iteration that you see above. Paul Spencerhttps://www.blogger.com/profile/07514836858344391753noreply@blogger.comtag:blogger.com,1999:blog-8689487740107692135.post-66871553401087428642012-09-30T11:51:24.242-07:002012-09-30T11:51:24.242-07:00That resembles a bit with an oblate spheroid profi...That resembles a bit with an oblate spheroid profile a la Geddes.<br /><br />If that's the case, it would be the first attempt to use such a transition to a four-sided conical.Florinnoreply@blogger.com