Even number of tweeters leads to even order harmonics, but an odd number of tweeters will lead to even order harmonics, so I'd do six or eight.
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Tekton Double Impact & Comb Filtering
Like many of you, I have been pondering purchasing these speakers but am very curious about the unusual tweeter array. I asked the smartest speaker person that I know (he is a student of Sean Olive) about the design and below is what he had to say.
"In theory it could work, but the driver spacing means that the crossover point would need to be very low.
He is using the SB acoustics tweeter which is 72mm in diameter, center to center on the outside opposing drivers is around 5.7 inches, which is about 2400Hz. This means that combing would stop between 1/4 to 1/2 of the wavelength (between 1200-600Hz) is where the outside tweeters should start playing nice with each other.
Since he is not using low enough crossover points he has created a comb filtering monster. Now while it's not the great point source that was promised, it's no worse than most line arrays and the combing will average itself out given enough listening distance.
The MTM spacing on the other hand is ridiculous. Hopefully he is cutting the top end off on one of those midrange drivers to avoid combing."
"In theory it could work, but the driver spacing means that the crossover point would need to be very low.
He is using the SB acoustics tweeter which is 72mm in diameter, center to center on the outside opposing drivers is around 5.7 inches, which is about 2400Hz. This means that combing would stop between 1/4 to 1/2 of the wavelength (between 1200-600Hz) is where the outside tweeters should start playing nice with each other.
Since he is not using low enough crossover points he has created a comb filtering monster. Now while it's not the great point source that was promised, it's no worse than most line arrays and the combing will average itself out given enough listening distance.
The MTM spacing on the other hand is ridiculous. Hopefully he is cutting the top end off on one of those midrange drivers to avoid combing."
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- 362 posts total
"I think the double impacts would sound better with only five tweeters rather then six. In my mind that center tweeter is going to interfere or get interfered with by the other five. Thoughts?" From what I understand only the center one is a tweeter. The six in the ring are coupled and crossover’d to be the midrange. The small/combined drivers can react quickly due to their low mass. The ring around the tweeter gives a point-source co-axial affect. |
" And where did you get that information about a co-axial effect? The Tekton web site?" It seems to be stated in various Tekton threads. Here's an example: https://forum.audiogon.com/discussions/tekton-impact-monitors?sort_order=asc |
- 362 posts total