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CES 2016: Dayton Audio Constant Beam Transducer (CBT) Speakers

amirm

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#1
Not sure how many of you know Don Keele or CBT technology. I will write more when I have time but this is a method by which the sound beam can be concentrated and made uniform in a truncated arc. Don has been showing this design for a while (which he perfected while at Harman) but it was always a kit. Now it comes finished for just $1,200.
093A7977.jpg
 

amirm

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#3
He had augmented it with a sub using a minidsp. The total package was really good! You all wanted to know about bargain products, this is it!

If you have not heard a CBT speaker, you are in a for a treat. You can walk up to the speaker from 8 feet to almost zero and the sound level does not change! Nor does its characteristics! They make really good rear speakers for multi-channel as regardless of where you sit, you get similar sound left to right.

I asked him to play music with good low end and he played a recording of drums done for him with no eq or limiter. It sounded very good!

BTW the Kit version is $600 (?) less but seeing all the work from painting to wiring I would go for the finished good.
 

RayDunzl

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watchnerd

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#6
He had augmented it with a sub using a minidsp. The total package was really good! You all wanted to know about bargain products, this is it!

If you have not heard a CBT speaker, you are in a for a treat. You can walk up to the speaker from 8 feet to almost zero and the sound level does not change! Nor does its characteristics! They make really good rear speakers for multi-channel as regardless of where you sit, you get similar sound left to right.

I asked him to play music with good low end and he played a recording of drums done for him with no eq or limiter. It sounded very good!

BTW the Kit version is $600 (?) less but seeing all the work from painting to wiring I would go for the finished good.
The data sheet makes reference to some new Dayton brand called 'Epique', but if you go the URL you get 'Coming Soon':

http://www.daytonaudio.com/index.php/epique

Any insight on Epique from the room?
 

Sal1950

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#8
$1200 each or pair? Including the sub?
Not a rap but isn't this just another play on a line source design?
 

watchnerd

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$1200 each or pair? Including the sub?
Not a rap but isn't this just another play on a line source design?
Looks like it to me. I'm not getting what makes it special / different from other line stages.

Other than the underwater driver...and not sure why that would be a desirable attribute.
 

RayDunzl

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RayDunzl

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#12
Do you know what is meant by 'shaded' in that graphic?
Electronic signal delay, I think. Maybe wrong.

Intensity differences among drivers - intensity shading

Curved - divergence shading
 
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amirm

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#13
Do you know what is meant by 'shaded' in that graphic?
Yes. Shading means changing the output level as the arc moves back. I think this design is -6 db and -12 db for the upper clusters respectively.

The math is based on Legendre function:

upload_2017-1-7_23-23-45.png


The order determines the beam pattern. Out of that you can compute the shading (level decrease). Here is an example from Don's presentation:

upload_2017-1-7_23-22-43.png


Here is the directivity without shading:

upload_2017-1-7_23-25-31.png



Notice the chewed up response as frequencies go up. Here it is with shading:

upload_2017-1-7_23-26-7.png


There is still change but it is very smooth.
 

amirm

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#14
$1200 each or pair? Including the sub?
$1,200 for a pair. The sub is also a very cheap DIY. They sell you the box and this large woofer to go with it.
 

amirm

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#15
Looks like it to me. I'm not getting what makes it special / different from other line stages.

Other than the underwater driver...and not sure why that would be a desirable attribute.
Line drivers claim to do this but they do not. CBTs produce a constant beam that is independent of frequency. See the unshaded responses above as an example of what people call a "line source" versus CBT.
 

watchnerd

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#16
Yes. Shading means changing the output level as the arc moves back. I think this design is -6 db and -12 db for the upper clusters respectively.

The math is based on Legendre function:

View attachment 4424

The order determines the beam pattern. Out of that you can compute the shading (level decrease). Here is an example from Don's presentation:

View attachment 4423

Here is the directivity without shading:

View attachment 4425


Notice the chewed up response as frequencies go up. Here it is with shading:

View attachment 4426

There is still change but it is very smooth.
Thank you for that answer.
 

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