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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Re-phrasing it, then ---- posted by J.D. on June 15, 2005 at 13:16:20:
What follows is my opinion only (just so I don't have to keep typing "I think" or "I feel").The most important vibration modes are those where the vibration can cause relative motion between styls and groove. Assuming stereo operation, lateral vibration will be picked up as noise, longitudinal as speed variation and vertical as difference between channels. For most of the noise produced by a turntable this last is relatively unimportant.
It is therefore best to couple the deck to the plinth in such a way that the relative motion produced by the two horizontal modes is minimised. The key to this is consistent propagation velocity. The propagation velocities of the materials in the Garrard itself are clustered between 4000 and 5000 m/s so the ideal material will have a velocity in this range.
Plywood is relatively isotropic in the plane of the laminae for the simple reason that it has two average grain directions not one. Across the plane of the laminae the story is very different - the modulus of elasticity is less than a third, so the propagation velocity is nearly halved. Birch ply has a propagation velocity around 4200 m/s in the plane of the laminae so it works very well with the plane of the laminae parallel to the plane of the turntable deck.
Non est ars quae ad effectum casu venit - Seneca.
"That which achieves its effect by chance is not art"Mark Kelly
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