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In Reply to: RE: Fostex alnico tweeters posted by Don Reid on December 10, 2016 at 12:12:08
Where and how do you mount your tweeters? I have Oris 150 horns, and I like to give them a try.
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Hey, belyin. The way I mounted the Fostex bullets with the Oris Horns is a method I would only recommend to someone who uses DSP, is retired, has plenty of time on their hands and really really enjoys spending a lot of time in their workshop working on speaker projects.
As the photo shows I made what I call a tweeter crane which brings the mouth of the bullet tweeters above and even with the mouth of the Oris horns. I chose this mounting method in hopes of achieving a cleaner wave launch from the bullet tweeters. The obvious distance displacement between the acoustic centers of the tweeters and the Oris horn drivers would make this mounting technique unworkable without DSP to correct for the time lag.
good morning Don... my set up components are similar, Onken 360 cabinets with GPA 515LF bass, Oris 200 with AER MD3 and Fostex T900A... passive crossovers at 400 and 6000... with the AER MD3 so $$$ thought I would try two way to let the AER drivers really play and like this a lot more then 3 way... have you tried this ?
Hey, awsjr. I played the Oris horns in a two way setup with the bass bins of a pair of Klipschorns providing the bass. DSP corrected for the time difference caused by having the Khorns back in the corners and the Oris horns out in the room. The two way setup sounded good but lacked the high frequency shimmer or sparkle present in most live music. The t900a tweeters corrected this and greatly improved the accuracy of the system.
I wish I had one of those! Check that: I wish I had two of those.
It's not pretty when I do woodworking, though.
It's also not pretty when I dabble in the digital domain.
Thanks, though, for sharing that idea & image!
all the best,
mrh
Wow. Beautiful work. What about matching polar dispersion? At what X over frequency?
Thanks for the compliment, claudejel.
I did consider polar dispersion along with many other factors before I decided that the best compromise to try was the tweeter crane. After cobbling it all together I made jigs which allowed me to quickly and precisely position a laser gun sight at the mouth of the Oris horns and bullet tweeters which directed the laser beam along a path that at least theoretically followed the center of the sound wave projected by each horn/driver combination. Then I aligned each horn driver combo so that the red spots from the four positions of the laser appeared at a point on a screen just behind my listening seat about 1/2 meter above and 1 meter behind my ears. Actually the four laser spots hit within an area about the size of a half dollar coin. Aligning them to all hit at the same point just wasn't possible, and I thought I might go crazy if I kept attempting that. Then I listened. I was pleased, but being well into geezerhood my ears aren't as good as they were fifty or sixty years ago. The real acid test was when I invited audiophile friends over for a listen. They too were pleased by the sound.
The only way I thought I could achieve great polar dispersion was to make a jig which positioned the bullet tweeters in the center of the mouth of the Oris horns, and that was a nonstarter because of the havoc I thought it would wreak on the sound of the Oris horns.
Crossovers are at a nominal 8kHz with both high pass and low pass slopes at 96dB/octave.
Excellent approach. Gotta love modern DSP technology coupled with horns!!
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