circle of sound

[gordon stelter]

The spruce has resonant qualities of its own. 
     Thump

--- James Grebe <pianoman@accessus.net> wrote:

> 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
> BECOME WHAT YOU BELIEVE!
> pianoman@accessus.net
> ----- 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
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > The all-new My Yahoo! - Get yours free!
> > http://my.yahoo.com
> >
> >
> > _______________________________________________
> > pianotech list info:
> https://www.moypiano.com/resources/#archives
> > 
> 
> 
> _______________________________________________
> pianotech list info:
> https://www.moypiano.com/resources/#archives
> 



		
__________________________________ 
Do you Yahoo!? 
Meet the all-new My Yahoo! - Try it today! 
http://my.yahoo.com