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Re: [OM] OT: audiophile's news

Subject: Re: [OM] OT: audiophile's news
From: Fernando Gonzalez Gentile <fgnzalez@xxxxxxxxxxxxxxx>
Date: Fri, 23 May 2003 19:13:24 -0300
on 23/05/2003 17:44, AG Schnozz at agschnozz@xxxxxxxxx wrote:

>> Why not just use a synthetic "jelly" pad (like the ones used
>> for wrist rests when operating a computer mouse)?  A lot less
>> heavy, and a great vibration damper.
> 
> Actually, no.  The "jelly" pads tend to magnify vibration
> instead of reducing.  Think old Ford sedan with dead shocks.
> The springs work, but there's no damping mechanism.  Back in the
> days when I worked in the electronics manufacturing realm we
> tested this type of technology.
> 
> Real silica sand provides the best isolation. In recording
> studios we've been known to float rooms on sand AND pour sand in
> the walls. Twin double-studed walls with 1-2 layers of sheetrock
> with sand inbetween.
> 
> The walls between studios looked like this:
> 1. Surface acoustical treatment
> 2. Plywood or sheetrock (depending on LF absorption issues)
> 3. Second layer of Plywood or sheetrock (depending on LF issues)
> 4. Split Studs (staggered one inch)
> 5. Fiberglass insulation between Studs
> 6. Sheetrock
> 7. Sand
> 8. Sheetrock
> 9. Fiberglass insulation between studs
> 10. Split Studs
> 11. One or Two layers of Plywood or Sheetrock (depending on LF)
> 12. Surface acoustical treatment.
> 
> We would cut the concrete floors between studios and made sure
> that there was absolutely no mechanical connection between them.
> 
> One facility in Nashville has two-feet of poured concrete for
> the floors. The mastering suites have the speakers mounted in
> six-foot thick concrete walls.
> 
> Speaking of suspending... The old WXYZ studios in Detroit (where
> the Lone Ranger, Sgt Preston, and the Green Hornet originated)
> were suspended by piano wire.  The entire rooms hung by wire and
> had rubber bumpers on the sides.
> 
> In the RTE Studios (Dublin, Ireland), there is a soundstage for
> broadcasting and recording orchestras that has an isolated pad
> where the orchestra sits. Any microphone stands sit on the pad
> and are isolated from the surrounding floor area.
> 
> The NPR studios in Washington DC are completely the opposite,
> though. The building construction uses "post-tension"
> construction. The floors are about as bouncy as a drum-head. You
> can hear and feel it when somebody moves a file cabinet anywhere
> in the building.
> 
> In San Francisco there is a pair of radio station studios
> located on the upper floors of a downtown office building.  Big
> mistake.  Every time the pumps, chillers or elevator motors kick
> in the microphones swing and shake.
> 
> AG-Schnozz
> 
So... why do you think the 200/4 Zuiko is so prone to vibration?

Fernando.

> on 14/05/2003 22:35, C.H.Ling at chling@xxxxxxxxxxxxx wrote:
> 
>> The 200/4 is not bad optically but it is very easy subject to
>> vibration, handheld with shutter speed of greater than 1/250s will get
>> most out of it. Use tripod at 1/4s to 1/125s will not easy get very
>> sharp pictures.
>> 
>> C.H.Ling 


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