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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Horn body resonance: Its true what they say...Posted by jessie.dazzle on: 7/22/2010
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About horn body resonance:
I used to doubt the need for mass in horns; after all, how much energy can a flimsy paper cone generate? Still, I went ahead and followed the advice of others when building mine, making them very strong and heavy.
With the upper-bass horns finished, I set about adjusting the rear chamber volume, and guess what, no question about it, while playing certain test tones at around 95dB, the flimsy little paper cone of an 8" driver made the 400lb (3" thick, made from masonry) body of the horns very obviously resonate to the touch. I could not hear the resonance, but I could certainly feel it. Keep in mind I am talking about upper-bass horns here.
In the case of my still un-damped mid-bass horns, a cheap clock radio playing music while located in the throat is enough to make the body resonate near the mouth; this observation was made with only half a horn playing into "half space" (against the floor). In the case of these horns, the stiffening ribs do serve to raise the natural resonance of the horn's body, but their main purpose is to maintain the horn's shape.
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