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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Some very raw numbersPosted by Romy the Cat on: 6/16/2010
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I ran today some numbers for the triangle horns. In the best case scenario I hope my attic would allow me to make two triangular horns 4 by 6 feet. I did some very preliminary math and concluded that 4X6 triangle will allow me to do what I want. Take a look and correct me if I am wrong.
The 4X6 feet makes 48” by 72 “or 1728 sq inch. In metric the surface will be 11148 sq cm. Remember this number – this is the key numbers – the surface of the obtainable mouth. The throat will be 8” or 20.3cm or 323.7 sq sm. Now, what kind of horn I can build between 20.3cm throat and 11148 sq cm mouth? It will all depend of what size horns I would go. It would be nice to have ½ size but I am not sure that it would be smart. The long side of my horn will ne loaded directly to the ceiling, so it is very possible that ¼ horn will do very nice. So, for ¼ of size I can with this moue get 45Hz. I calculated the exponential profile with a minor hyperbolic inflection of 0.7. According to calculation the target surface mouth for such a 45Hz horn will be 11780 sq cm, which is very close to my 11148 sq cm. So, it will be let say 47Hz horn – very nice. This horn will not be too long as well – just 238 s cm or 7.8 feet. I sound very manageable if I did not make any mistakes.
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