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Just checking, but should these be wired in or out of phase?
Because you're mimicking a dipole unit, it would be wired out of phase.
It's more complicated than just wiring them out of phase. That's a start but depending on how and where they are mounted you could be running into all sorts of off axis problems. Why not just use a dipole tweeter?
I guess I'm saying try it and see.I did some experimentation and got different measureable results by varing the phase and distance, but my listening tests were inconclusive with a pair of Vifa's ring tweeters.Hope this helps.
As a slight aside, with big open baffles and room interactions where do you make measurements?I have always felt that a position midway between where my ears would be is best.
Interesting So are you saying that you do all measurements in free space and only do listening tests (not measurements) from the seating position?
Doesn't that eliminate soft dome tweeters? Then I'd wonder about the vertical off axis response, or if that's important.
Ok. I'll dive in with an "answer".As the cones (or domes, rings etc.) of back-to-back tweeters are more than half a wavelength apart depending of frequency, there is probably no correct answer to this question.If they are wired in phase then theoretically you will get a null 90 degrees off axis but this may not give the best sound.I guess I'm saying try it and see.I did some experimentation and got different measureable results by varing the phase and distance, but my listening tests were inconclusive with a pair of Vifa's ring tweeters.Hope this helps.
Listening tests inside but directivity/FR tests outside on a rig largely free of reflections in the mid-treble range. I rotate the speaker and keep the mic on the ladder... look closely!!
I just got one of these rotating platforms and it is much easier to do off axis measurements now.https://www.arborsci.com/products/rotating-platform