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In Reply to: RE: Looking for a wood turner posted by Duke on November 23, 2014 at 00:28:44
Why go back to the 1990s design? Big round bells are such a pain to integrate most systems with such focus on midbell the rest a afterthought.
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My most-requested models used modest-sized round horns, and imo integration with the woofer was one of the strong points. And in my experience people are less likely to "listen with their eyes" if it's a round horn. Also with a profile like the oblate spheroid (perhaps with a minor modification to the mouth radius), I think we're post-90's in performance.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Thought you were thinking big bell 32in. Have you tried Faital Pro or http://www.autotech.pl/pdf/audio_en.pdf or http://stereo-lab.de/1-inch-horn-cf-400Hz-Wave-Guide-Tractrix-Horn-lower-physical-cut-off-frequency-Made-in-Germany-from-Stereo-Lab
I'm looking for a custom profile, something constant-directivity that would pattern-match with its woofer in the crossover region.Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Edits: 11/26/14
Duke, Bill Grumbine can probably turn anything you need. He may not have turned horns, but he's as talented as they get.
http://wonderfulwood.com/
I can make you a set of wood horns if you like. See my blog posts to see if this is something that suits your needs. I can't change the size or horn flare since my cutting blade is CNC machined for the whole profile.
http://croweaudio.blogspot.ca/2014/06/oblate-spheroidal-horn-completed.html
Very interesting.
Did you have the tool custom made to your specifications? That's what I figured I'd probably need to do - have a tool custom made, that would result in the profile I'm looking for. Which unfortunately would call for a larger round-over at the mouth than what your tool is made for.
Thanks!
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Yes I had the blade made on a Cnc machine. I made the drawing of the blade. The blade profile was based on the formula for the oblate spheroidal curve. I wanted this horn flare because of the pattern control at extremely high frequencies. The profile doesn't load as well lower down in the frequency spectrum like an exponential horn but for me I wasn't going for efficiency. This horn provides a very broad coverage right up to the threshold of hearing, which provides a very wide soundstage. Room acoustics therefore impact the overall sound balance but provide a more live listening experience. I'm using the b&c de120 compression driver, what do you plan on using?
I'd be doing something based on the oblate spheroid, but with a wider radius mouth. Just a slightly different set of tradeoffs.
I'm now thinking that being close to my wood turner would be very helpful, so geography is starting to win out over experience. But that's a beautiful job you did!
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
"Why go back to the 1990s design? Big round bells are such a pain to integrate most systems with such focus on midbell the rest a afterthought."Then what do you suggest instead? Round horns are not good in the vertical, but they are near perfect in the horizontal.
Big speakers and little amps blew my mind!
Edits: 11/23/14
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