FW: Helmholtz Resonator

[Alan W Deverell]

Who wants to know what ???

-----Original Message-----
From: Singleton, Roy RXS [mailto:roy.singleton@bellgully.co.nz]
Sent: Thursday, September 03, 1998 9:39 AM
To: 'Alan W Deverell'
Subject: RE: Helmholtz Resonator


Can't really follow this.

But!  I have done quite a bit of work (design, measurement,
experiment)
with Helmholtz resonators.  The trap for the ignorant (most frequently
musicians!) is that despite its name the H.R. actually ABSORBS sound.
So that large pottery urn and empty gin bottles gracing the music room
are actually going to absorb sound over a very narrow bands of
frequencies (high Q).  Similarly the bass reflex speakers.  All these
items should be chosen carefully to minimize the room and piano
defects
(TIC).

> -----Original Message-----
> From:	Alan W Deverell [SMTP:aland@casa.co.nz]
> Sent:	Wednesday, September 02, 1998 10:56 PM
> To:	Singleton, Roy RXS
> Subject:	FW: Helmholtz Resonator
>
>
>
> -----Original Message-----
> From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org] On
> Behalf
> Of Richard Moody
> Sent: Wednesday, September 02, 1998 9:40 PM
> To: pianotech@ptg.org
> Subject: Helmholtz Resonator
>
>
> Jim,
> 	The Helmholtz resonator, do I have to dig into Dolge?.  I can 't
> believe
> you are the only one who responded to my question, and unfortunatly
> you
> are wrong.  Sorry. : ) Its NOT the tension regulator, or resonator,
or
> was
> that a mis-pelling?
>
> Thanks for your interest. and your reply, and your esteemed
> knowledge.....
> . am I repeating myself?   ?.......   ..../  ?   ?
>
> Ric McDuh
>
> ----------
> > From: harvey <harvey@greenwood.net>
> > To: pianotech@ptg.org
> > Subject: Re: M&H BB harmonic
> > Date: Tuesday, September 01, 1998 2:22 PM
> >
> > [Lost thread reply flood -- catching up]
> >
> > Ric Awondering: Hmmm. Helmholtz Resonator. I think that's either a
> speaker,
> > or something requiring shots from the clinic. Perhaps you're
> thinking of
> > the term I *should* have used instead of "spyder" -- that is, the
> Tension
> > Resonator.
> >
> >
> > At 12:47 AM 8/23/98 -0500, you wrote:
> > >Wasn't a Helmholtz Resonator put in some of these pianos. I have
> never
> > >seen one, only read about it.  Don't they resemble the shape of a
> trumpet
> > >mute?   Were they to eliminate certain resonances, or inhance
them?
> > >
> > >Ric Awondering
>