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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."

seanheis1
kdude66
1,200 posts
 
Missioncoonery,

I may be stomping my feet to the wonderful sounding music,but at least I can spell the English language.

Just Saying.

Kenny.

grannyring's avatar
grannyring
6,467 posts
 
@seanheis1,

Can you help us better understand how your expert friend is testing and measuring the DI speaker? I am sure he must have a pair to take measurements of. Did he actually precisely measure all the details he is talking about? I assume he has the crossovers in hand and knows the precise workings and design of it.

Surely he is not speculating and has first hand knowledge?

Oh wait, he has no idea as he Doesn’t know the precise crossover points. His quote proves that in your comments. Oh, he has never touched a DI speaker with his expert hands. Am I correct? Please confirm.
Is is possible that after having an actual set in his possession, and running actual tests, he would come to a very different conclusion? Please comment. 

I have read many of your other posts and think you are a reasoned Agoner. Please comment on the fact that this is all speculation and none of it is factual or helpful to our fellow group of music lovers here. We do have a level of responsibility here when we post. Other audiophiles come here to learn and make buying decisions. We should help, not hurt this process.
missioncoonery
1,215 posts
 
Kenny....i think your now wasting our time...just saying lol
bullitt5094's avatar
bullitt5094
266 posts
 
Why do normally reasonable people want to hate this speaker when they have never been in the same room with it. Then ignore the fact, 99% of the people who have heard it and/or now own it, absolutely love it? Is it the fact the haters own expensive speakers and the thought that something in this price range is so good, it cuts into their systems' "exclusivity". Are they audio snobs? Wow, I really hope not.
seanheis1 OP
623 posts
 
Can you help us better understand how your expert friend is testing and measuring the DI speaker? I am sure he must have a pair to take measurements of. Did he actually precisely measure all the details he is talking about? I assume he has the crossovers in hand and knows the precise workings and design of it.
Grannyring - I am not a speaker designer nor an engineer. My source knows the tweeter used as well as the spacing of the tweeters and box. It appears that he is using math to calculate the comb filtering. If someone can explain why there would be no comb filtering or how he solved that particular problem, I would love to hear.
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