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To make both angles similar, the horn must be physically symetrical. It's that simple.
Does this depends on its length and flair? . If I choose a pipe and mount a speaker at its rear its not at all directed , is there someting else to it?
First off: I have to check my spelling befor I post. Mulicell should have been multi-cell
Second: The original poster did not state if this was a project for a toy, vacuum-cleaner or a 50,000 seat arena.
Please tell us what your goal is!
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Did you you try the link I posted on post# 5, information there for designing horns.??