HexaBeam36 CBT Speaker Module
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The components needed to build a complete speaker module, of which six are needed to complete a full CBT line array.
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Model information
- Source
- Printables
- Category
- Audio
- License
- Creative Commons — Public Domain
The original CBT36 Constant Beamwidth Transducer line array was invented, designed and built by Don Keele. For several years, you could by a kit for a pair of these innovative speakers but they are no longer available. This is my adaptation of Don's original design using relatively low cost and readily available speakers.
For one module, you need to print one each of the five parts. A complete array requires six modules, so be prepared for a lot of filament and print time!
Baffle2.3V3 = printed in PLA and holds the two mid-bass drivers and eight tweeters. You'll need to rotate the part by 87-degrees after bringing it into your slicer. I recommend 3mm perimeters and a 30-40% Gyroid infill for strength and stiffness. This is designed to be printed flat on the bed, without supports but brim is recommended. I print the first 15mm at a relatively high layer height for speed but modify it to a much lower layer height for final layers to get a smoother top surface.
Tweeter Gasket = this part is printed in TPU and is located between the Tweeter Cover and the Baffle2.3V3 and provide the compression to hold the eight tweeters in the Baffle. This is a thin part so you probably only need 3 or 4 layers.
Tweeter Cover = the part is printed in PLA and should be printed with a low layer height to preserve the radius flare by the tweeter opening. This part is screwed down into the Baffle2.3V3 and compresses the Tweeter Gasket against the tweeters.
Port 4 148Lx37D Hex = a port design that it tuned to 55-56 Hz when used with the Dayton Audio TCP115-8 mid-bass drivers. It is printed in PLA and can be printed with hexagon face down against the build plate without supports. I turn on ironing for the top side so the back surface sits flat against the rear enclosure. This part is held in place with 6 M3 screws.
Enclosure2.3V4 = the main rear enclosure, printed in PLA. It will also need to be rotated by 87 degrees so the back sits flat against the build plate. I print this with a 0.8mm nozzle, medium layer height, 3mm perimeters and a 15% Gyroid infill. Filament weight will be around 1500 grams!
I'll be working on a separate assembly manual and will add a link when it's available.