[pianotech] Louder, after tuning? (simplified)

[Piano Boutique]

I think that is just what I wanted to say?

William


----- Original Message ----- 
From: "Tom Rhea, Jr." <rheapiano at cox.net>
To: <pianotech at ptg.org>
Sent: Thursday, December 30, 2010 5:47 PM
Subject: Re: [pianotech] Louder, after tuning? (simplified)


> The strength of the sound a string generates is in its amplitude (the
> distance from peak-to-peak as measured with an oscilloscope).  Two or 
> three
> wires tuned to exactly the same frequency will, being in phase, reinforce
> each other and sound louder to the ear and on an oscilloscope.  If one
> string in a bichord is slightly off tune to the other then a heterodyne
> effect is created where the off-tuned string actually detracts from the
> amplitude of the combined string combination and can be heard as a 
> "beating"
> sound.  The beating can be hardly noticeable (i.e., very slow) to rapid.
> The beats are a result of the two string frequencies combining in a
> non-linear medium (the strings themselves) and creating a difference
> frequency (the beats) which is a difference of the two individual string
> frequencies.  This difference frequency actually acts as an out-of-phase
> component and reduces the combined amplitude of the two individual 
> strings,
> thus making the overall amplitude less.  The effect is even more 
> pronounced
> on a trichord.
>
> In actuality, though, tuning a bichord or trichord will result in an 
> overall
> increase in amplitude but it will be a bit less than if the two or three
> strings were perfectly in tune (in phase).
>
> Tom
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
> Behalf
> Of Piano Boutique
> Sent: Thursday, December 30, 2010 4:30 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] Louder, after tuning? (simplified)
>
> Keith,
>
> I guess I should have said that the strings transfer to the sound board 
> vie
> the bridge, but I am a simple kind of guy.
>
> William
>
>
>
> ----- Original Message ----- 
> From: "Mr. Mac's" <tune-repair at allegiance.tv>
> To: <pianotech at ptg.org>
> Sent: Thursday, December 30, 2010 3:03 PM
> Subject: Re: [pianotech] Louder, after tuning? (simplified)
>
>
>
> On Dec 30, 2010, at 1:34 PM, Piano Boutique wrote:
>
>> keith; It is my understanding that two strings in tune are lowder. They
>> move together and show louder patterns on a DB meater. By working
>> together; they move more air.; Two strings out of tune have more 
>> disanence
>
>> and are harsher on the ear drum; which would confuse the human; but shows
>> not as lowd on a meater.; This is just what I have ben told and i give it
>> you in good faith.; William Benjamin; PTG RPT
>
>
> Very interesting information you have presented, William.
>
> Perceptions are so individual, yet, apparently not so on a measuring 
> device
> as you have indicated.
>
> Thank you so much for sharing as you have done.
>
> Keith=
>