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In the Forum: Horn-Loaded Speakers
In the Thread: Impulse response, short notes and midbass horns.
Post Subject: Horn wall vibrationPosted by Bill on: 6/15/2011
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I had the same problem with my 6 foot, bass horns , which were built from 3/4 inch high density fiberboard. On doing some measurements back then, it turned out that they were vibrating for a few milliseconds after a pulse, giving a decent rise time but anelongated tail to an impulse response graph.. This was improved by adding 3/4 inch spacer with a second wall of high density birch plywood with the space filled by sand, plus filling the back chamber with 3 inches of Sonex, which decreased significantly their vibration. You've heard the results.
By the way, last night was one of those magical nights when the sound was superb for about three hours. So even with the purepower units there is still some sort of leakage of electrical junk into the system. Queestion is is it coming directly from the AC or through the air through RFI or some other yet unknown energy.
Bill
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