debra pid=70598 dateline=1584784219 said:
HiTechBiniou pid=70589 dateline=1584753355 said:
Here is a try... to explain...
...
The video is very interesting. Many thanks!
The video ends with the message that the accordion will be happier when it is places/stored in the playing position (not on its feet). Finally some source that confirms what I have been saying all along and which has been met with disbelief, even by accordion makers.
As to whether reeds are more tightly connected to the reed blocks in the French accordions (gasket + nails) than in Italian ones (wax, sometimes also with nails, most of the time without)... Im not convinced. When you have good, not too old wax the reed plates connect very well to the reed block. When the wax gets old and brittle you can sometimes hear the wax not holding the reed properly (the reed not only goes out of tune but you start hearing additional noises). Nails may prevent the reed plates from falling out completely but do not really contribute to sound transmission from reed plate to reed block. In the accordions with gasket + nails the gasket actually allows the reed plates to vibrate slightly, and I believe the transmission to the reed block is actually less. Having a much larger, thicker, more solid reed plate would help. For this reason on the bass side some accordions already use a single large reed plate for multiple notes, and in Russian bayans all reeds are on such larger plates.
Having worked on both a French accordion (with gasket + nails) a and Russian bayan (gasket + hooks on large reed plates), besides many Italian accordions with wax, I can definitely tell you that getting the tuning to stay (stable) is harder with the gasket type. Some notes on the French accordion went considerably out of tune after just a few months of playing, presumably because of less grip of the nails. On the bayan the precise level of seal is also important (I mark the position of the hooks before undoing them) but the bayan also has a problem of being more susceptible to a slight variation in resistance from the leather valves. But thats a completely different story.
Thank you Paul for your kind words.
You did NOT understand the formant principle I explain (in French) in my accordion guide.
First, there is NO ENERGY/SOUND TRANSMISSION FROM PLATE TO REEDBLOCK WHATSOEVER.
Same as there is no energy/sound transmission from reed to plate.
Please read the next post where I try to translate the video...
Here is a translation of the video content starting at 1:50
The reedblock does not amplify the sound produced by the reed. As proof, the tuning fork is not amplified when pressed on the reedblock.
But the reedblock do transmits the mechanical vibration of the tuning fork when it is brought into contact with an amplification surface.
The reed has no mechanical energy unlike the tuning fork and therefore, it has nothing to transmit to the amplification surface.
Notice when I blow in the reedblock at 2:15, same sound when no contact with the surface as when in contact with the surface unlike the tuning fork that has energy to transmit.
The sound is produced inside the sound hole, not by the mechanical energy of the reed itself.
Why does the reed have no energy?
Because it is not the mechanical source like the tuning fork.
The reed is part of the whole plate/reed/sound holes system.
And this is what we call a
FORMANT.
The reed is only used to produce the pressure variation and the speed of air intake to produce sound.
Now lets see why an aluminum reedblock would be more efficient and produce a better sound than the usual wooden reedblock:
This is because all the elements that are part of the sound source must be securely fixed to avoid loss of energy. Therefore, an aluminum reedblock would be more efficient in terms of sound because it is more rigid and stable than the wooden reedblock. There would be less loss of mechanical energy.
Movement of the reedplate if it is NOT SOLIDLY FIXED
Here is an animation (see the video...) to illustrate the movement of the plate in slow motion if it is not securely attached to the reedblock.
This movement do occur in waxed reed plates so the oscillation of the reed itself will loose energy and produce a poorer sound with less harmonics (overtones).
Even the reedblocks move with the movement of bigger reeds. This is why we use stabilizer bars that unite the top of the reedblocks together so the ensemble is more stable.
Again, to stabilize the reedblock, bars of reedblocks are installed which mechanically unite the heads of the reedblocks.
The red arrow show where the reedblocks can move if not stabilized by bars.
The bayan accordion sound richer (brighter, more overtone, more harmonics, etc.) than the Italian accordion because of the multiple reeds united in a single long plate. The whole thing is more rigid so the reeds do their job without any disturbance or loss of energy.
As for the Italian accordions that sometimes sound richer and brighter even when waxed, please visit my Castelfidardo page
https://en.mariobruneau.com/castelfidardo/
You will see that I have conducted some kind of research to find the richer musette sound and as you can witness, the second richest sound came from an Italian waxed accordion byMarco. This is because not all wax are created equal. The wax use in byMarco is harder than regular accordion waxes thus a richer sound.