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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
grannyring's avatar
grannyring
6,467 posts
 
 Agreed , it's great to ask questions about any product and that's what these forums are for However the OP is really not asking a question but throwing the statement out here based on nothing really There is a difference. 

It is a negative comment and not a question. So now the rest of us are asking him to back up his comment. It is his comment as he chose to use quotes from a friend of his.


charles1dad's avatar
charles1dad
10,250 posts
 
Onhwy61 ,
I whole-heartedly agree with your comment in regard to asking questions about a product.  However it is without question a different matter to present uninformed conclusions rooted in pure speculation. In my opinion the latter scenario has occurred on this thread. 
Charles 
onhwy61's avatar
onhwy61
5,215 posts
 
Please re-read the first paragraph of the OP.  I understand it as a request for information and comments about the loudspeaker and his knowledgeable friend's observations.

He's thinking of buying the loudspeaker.  Do you think the tone of some of the above responses further encourages him?
seanheis1 OP
623 posts
 
Agreed , it’s great to ask questions about any product and that’s what these forums are for However the OP is really not asking a question but throwing the statement out here based on nothing really There is a difference.

It is a negative comment and not a question. So now the rest of us are asking him to back up his comment. It is his comment as he chose to use quotes from a friend of his.
Just to clarify, these are not the comments of a friend. I reached out to a well known speaker reviewer and this was his response. He is one of those reviewers who is into measurements. His response put me into a hold pattern on whether or not I should purchase these speakers and I felt like the information was worth sharing and discussing.
charles1dad's avatar
charles1dad
10,250 posts
 
Onhwy61,
Read the judgemental comments (from his expert friend) that followed the "question" for example, "comb filtering monster" and "the MTM spacing is ridiculous"
Far from a simple and innocent question. Rather strong and negative assessment from someone with no direct interaction with the Double Impact. This is obviously more than an inquisitive question don’t you think? The entire post should be taken into consideration. 
Charles
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