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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
seanheis1 OP
627 posts
 
What I don't get is why Tekton is withholding the  frequency response graph of their speakers, so prospective customers can see how the speakers compare with their own, or with other brands.  
Zu Audio did the same thing as far as not releasing measurements. When reviewers started to release the measurements and they weren't favorable, folks who value objective measurements turned on Zu and began smearing their name.

If John Atkinson of Stereophile were to release poor measurements, then the Tekton's would be the high SPL equivalent of a Zu product. Some folks would feel duped while others would say that their ears are all that matters.    
erik_squires
16,202 posts
 
Oh, wow, this is so true, I mean, B&W, Magico and Martin Logan all publish FR graphs !!! << face-palm >>

No, no they don’t. It is not common practice at all. What is with this continuing onslaught of FUD not to mention double standards being pushed for this brand? Sheesh.

Best,

E
tektondesign
205 posts
 
John Atkinson did publish Tekton Measurements, this was the Enzo XL a few years back. I'd say we passed his tests and John had overall good things to say about the Enzo XL. And KEY to this dubious thread is no-comb-filtering reflected in John's measurements.  

Eric Alexander - audio designer

tektondesign
205 posts
 
Once again, and for the record... why I choose to not publish measurements:

"I've discerned over the years, the biggest gripe the critical types have with me is my decision to not publish measurements and/or extremely detailed loudspeaker specs. This really sends the tweakers into orbit! I design and build 'audio engine's'. Roger Penski, an internal combustion racing engine master said: "If you say anything to anyone, it's like cutting your paycheck in half." I appreciate his sentiment and wisdom."

Eric Alexander - audio designer
erik_squires
16,202 posts
 
I rather agree with Eric.

Also, this BS phase / comb filter issue is easy to test two ways

1. Play music. Sit in sweet spot. Stand up. Sound weird? No? No problem.

2. Play music. Walk across the sound field. Sound weird? No? Then no problem.

The basic FR measurements would not cover this. Off-axis measurements would, and all speakers have some of this. However had Eric really flubbed the tweeter array, it would be absolutely obvious to any listener. This isn't a hidden attribute only the best listeners could hear. ANYONE could hear it if present.

Best,

E
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