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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Hi Jim..... posted by Awe-d-o-file on December 1, 2014 at 12:14:28:
Awe-d : you asked about compliance, so I thought I'd give a short explanation. (Yes, I agree that soft footers eat treble. And rubbery/springy footers smear by storing energy and releasing in the future. But also hard footers have their own problems, for instance a bunch of resonances, which can make them shrill.)
The overall design goals were to make them hard-coupled in the vertical (up down) direction, with no compliance; but in the other two planes, laterally, there is a small amount of movement allowed which is damped with constrained layer damping.
This is realized using two variable-density top and bottom plates, kept apart by separators that allow some lateral sliding. This is also bound with a lossy elastomer to form a constrained layer damping system.
They are topped with a lead ball. Why lead? Well I tried other materials and lead sounded the most musical. Lead normally does not have a great sound when used (randomly) on audio systems - it can make things seem slow of muffled. But in this application it just works. It's coated with a thin layer of spray-on rubber which is removable. The rubber is so thin that it has virtually no effect on SQ
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Follow Ups
- RE: Hi Jim..... - beautox 19:04:42 12/01/14 (1)
- RE: Hi Jim..... - Awe-d-o-file 12:52:40 12/03/14 (0)
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