How to make a horn flare?

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I want to make a 'omni'(is this the right description?) directional speaker in a cylindrical base using the full range jordan units. These are for personal use so I want to experiment with a horn loaded flare firing upwards onto a 'cone' to disperse the sound. The cabinet will be a horn/transmission line type using 3 different size tube sections.

The biggest challenge is to make the flare. Is there anything ready made on the market?
Also the 5 inch Jordan units- how long do I need to make the transmission line?
 
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