Caster Cups

[Gregory Torres]

Larry,

I don't know about caster cups making the piano sound bigger than it is
unless, perhaps, it is set up on a wooden floor in the middle of a room which
could, in theory, transmit some of the sound passing through the
legs/castercups to the wooden floor, thus amplifying it very slightly. I
don't see how it could be significant unless it was a wooden floor where
underneath was no insulation and just open space, kind of like a giant
soundboard, if you will. Like I said, sounds good in theory but can this be
tested perhaps? Del, you out there??   : )

As to quieting with foam, yes, a piano can be quieted somewhat with foam
under the soundboard and above the strings.

Regards,
Greg Torres

Larry J Messerly wrote:

> Several years ago I was at an Arizona State seminar where The comment was
> made that  putting a grand piano on caster cups would improve the tone
> and volume of a piano and make a 5' grand sound like a 6' grand.
> Especially if the piano were on a concrete floor, even if it were covered
> with tile, carpet or wood.
>
> Later I received information from Yamaha on quieting a piano using foam
> under the soundboard, and/or on top of the strings.   They gave decibel
> readings on how much change could be accomplished using a variety of
> methods.
>
> Has anyone seen empirical information on decibel changes with the
> addition of caster cups in a variety of situations?
>
> Larry Messerly RPT
> Phoenix/Prescott
>
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