| Audio Tweaks - Tweak Ref.
403 |
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| Turntable
isolation via holographic setup principles |
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| 403 |
lamadoo |
The
Best |
$40.00 |
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| Physics
class |
Home-brew |
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| Holograms
are 3-D photos made by the interference patterns of
overlapping laser reflections. All external vibration must be
eliminated, just like isolating a turntable from footfalls.
One technique for a "hologram table" can be
transfered to our use: Stick a lot of mass on top of a sand
bed. Rather than build a wooden box to hold the sand, I bought
the biggest, heaviest roasting pan I could find. The metal
edge is rolled so it will never, ever split. In that I put 40
kg (20 US pounds) of aquarium gravel, still in its bags. On
top, I put a 40 kg (20 US pounds) stone block that doesn't
touch the edges. I was very lucky to find exactly the correct
shape and size but a garden center might have a flagstone that
would work. |
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| Since
there's so much weight, the shelving has to be tricked out
too. I bought two-meter-long vertical rails (6'). Since the
rails go to the ceiling but the turntable shelf is only one
meter (3') off the floor, all of the weight loads the rails
vertically. I shimmed them to plumb as I installed them. 50
centimeter (20") shelf brackets and a metal wire shelf
complete the installation. |
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| The
vertical rails are bolted to a load-bearing, brick, exterior
wall. |
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| No
amount of walking, dancing, stomping, or door slamming
(either in the listening room, nor in the room upstairs) has
any effect. |
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| Previously
I suspended my turntable from cables bolted to the ceiling.
While this isolated the table from MY footfalls, it coupled
the turntable to footfalls upstairs! |
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| Frank |
Did
you put sand on top of the rocks? |
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