circle of sound

[James Grebe]

It is my understanding that the Bosey rim is not laminated spruce but solid 
spruce edge glued and end glued to gether and then the shape is carved out 
of that.  That would keep the vibration back to the SB sine there are no 
plies to soak it up>
Jim
James Grebe
Piano-Forte Tuning & Repair
Creator of Handsome Hardwood Caster Cups, piano benches, writing instruments
(314) 608-4137
WWW.JamesGrebe.com
1526 Raspberry Lane
Arnold, MO 63010
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----- Original Message ----- 
From: "V T" <pianovt@yahoo.com>
To: <pianotech@ptg.org>
Sent: Saturday, January 22, 2005 1:10 PM
Subject: circle of sound


>
> Hi Terry, Ric, List,
>
> The radiation from speaker cabinet panels would not be
> desirable even if the radiated spectrum were flat,
> which it isn't.  So, MDF, being lossy (dissipative),
> is in that application a good choice (as long as you
> don't remind yourself that you paid all that money for
> particle board). Sustain is definitely not what you
> want in a loudspeaker box.  There is plenty of power
> available from the amplifier to drive the speakers and
> waste some energy in the fill material, the air
> inside, and the MDF.
>
> In contrast, a piano designer probably strives to
> direct as much of the energy into the soundboard and
> get the least energy loss elsewhere so that the board
> can keep vibrating as long and as vigorously as
> possible.
>
> Now, my question is: why does Boesendorfer get decent
> results with a soft rim.  Or, are the results that
> great?
>
> Vladan
>
> =============================================
>
> I don't know Ric, I'm not sure exactly how applicable
> it is, but the
> preferred material for high-fidelity speaker box or
> mounting platform is
> MDF. Also, while it seems a good idea that every part
> of the piano should
> play its role, I'm not sure that all parts need to be
> little soundboards.
> MDF might not hold a screw well, might fall apart
> rather quickly in the
> water, but as far as just being an immobile hunk of
> very dense stuff that
> doesn't vibrate very well - which, I think, is the
> basic function of an
> inner rim - it think it fits that bill even better
> than many hardwoods. It's
> also dimensionally quite stable (I think).
>
> Hmmmmm, an MDF pre-formed inner rim?
>
> I'm really not suggesting that, but I find it
> difficult to imagine how it
> would be a detriment to the musical properties of a
> piano when used as a
> case material.
>
> Terry Farrell
>
> Richard wrote:
>
>> Grin.... true enough Terry.... but then that said.
> Steinway does beleive
>> in the idea that every part of the piano should in
> someway or another
>> contribute to the projection and quality of the
> sound. Solid hardwoods
>> cases/rims... vs papboard...?  hmmm
>
>
>
>
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