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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
missioncoonery
1,206 posts
 
  If not mistaken Mcintosh uses a similar looking approach.The tweeters in the DI are very inexpensive,assuming to keep cost down but until I see a break down of what this speaker does,,,
mapman's avatar
mapman
21,932 posts
 
Personally I would avoid any line array design unless listened to  from a relatively far listening distance in a fairly large room.  Even then I am a fan of fewer drivers not more.
seanheis1 OP
595 posts
 
Sean,

There is some confusion in how the DI's are configured related to crossover points and the "unusual" driver configuration maybe this will help give a better understanding.
Hi Kenny, thanks for that explanation. It was actually the same explanation that I used when I asked him the original question about the line array and comb filtering. He responded with his own numbers that are in the first post of this thread.   
charles1dad's avatar
charles1dad
10,238 posts
 
According to the many posters on this site who’ve actually  listened to the Double Impacts they are unanimous in confirming their superb sound quality. It seems although this speaker has an uncommon driver array ( relatively speaking) the designer knew precisely what he wanted to achieve. Based on owner feedback he certainly has in resounding fashion .
Charles
kdude66
1,200 posts
 
Sean,

So if you asked your friend about the DI's already knowing pertinent details as I've mentioned why are you wasting our time with this nonsense.

Have you actually listened to these speakers or are you just trying to convince yourself they are not for you.

Just wandering,I go where my ears lead me and really don't care about specs at the end of the day.But I still can't help not measure and test sometimes just to back up what I hear.

Kenny.
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