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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: isolation - which component to control posted by arizonaphile on July 19, 2005 at 04:27:57:
what equipment racks attempt to do, in addition to supporting equipment, is to also isolate the equipment from vibration that can be fed into the eqipment, mostly from the floor of the room. The best method of eliminating this type of vibration is to reduce the area of the equipment that is in physical contact with the vibration source i.e. the floor of the room. If you live in a house built on a concrete slab the amount of vibration from the floor will be much lower than a house with a basement and wooden floors. Then there is the question of the resonant frequency of the 'rack'. All structures have a resonant frequency which, when reached, multiplys the forcing (input) frequency by up to a factor of 10x. You will perhaps recall the collapse of the "Skye Bridge" at the Ramada Inn in St. Louis some years ago when the bridge went into resonance and collapsed like a thunder clap. This brings up the question of airborn vibration which acts on both the rack and the equipment directly. Almost all of this vibration is a product of the loudspeakers. The best type of 'rack' would seem to be a triangular braced rack (exceptionally ridgid) which would rest on the very small points of metal spikes, thus reducing the area of the rack in contact with the source of vibration to the combined area of the spikes, which would be exceptionally small. These spikes would have to completely pierce any carpet in place and rest securely on the floor. If the floor were wooden the spikes should instead rest on metal plates resting on the carpet or floor. The equipment units should also rest on 3 spikes each with the spikes resting on metal plates or disks on the shelves of the rack. The best and most economical spikes for these uses are Archery Target Arrow Points having needle points of very small area. Airborn vibration acting upon the enclosures of equipment resting on the rack can be dramatically reduced by covering the equipment with 4-sided boxes of 3/8" hard maple, allowing enough over-size for adequate ventillation for heat dissapation. Perhaps not the best looking arrangement, but in this application it is definitely a case of function over form. A rack of this design should be quite easy and economically built as a DIY project at small cost compared to commercially made racks.Happy Listening !
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Follow Ups
- Re: isolation - which component to control - pkell44 14:06:19 07/20/05 (3)
- spikes couple not isolate - dave c 13:12:08 07/21/05 (2)
- Re: spikes couple not isolate - pkell44 19:05:11 07/22/05 (1)
- Re: spikes couple not isolate - dave c 13:34:43 07/24/05 (0)
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