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-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of Fernando Gonzalez Gentile
Sent: 23 May 2003 22:13
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] OT: audiophile's news
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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