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*An Official Foo-Approved guitarist since Sept 2023.
The initial signal is created entirely by the string vibrating, this signal is then amplified which then causes the air in the room to vibrate. The harmonic content of this sound is determined by the initial picking of the string, plus the harmonics added by the amp. This sound forces the body of the guitar to vibrate. The vibration in the guitar's body is most unlikely to be true 'resonance'. Rather the body of the guitar will be forced to vibrate in sympathy with the sound in the room. Crucially, the body cannot be vibrated by the air in the room until the signal has already been generated and amplified.
It doesn't seem clear to me how the guitar body could 'break' this initial signal, especially given that the amplifier will be producing far more energy that the body of the guitar could absorb, plus the very high impedance of the bridge / body interface on an electric guitar means that very little vibration from the body will be fed back to the strings which, let's not forget, are still been driven by the original signal and all that energy in the vibrating air in the room.
Meanwhile the player, being a bit of a shredder, already picked another 50 notes!
This next bit is even worse:
Three-ColourSunburst said: Apart from the fact that Impedance and Conductance are electrical terms, any bridge that will support the tension of the strings must be rigid. It will therefore transmit almost all of the vibrations of the strings to the body. The kind of bridge you are attempting to talk about that does not transmit vibration to the body would have to be made of something like rubber to absorb the vibration. It wouldn't be rigid and the guitar would not stay in tune.
I knew I shouldn't have looked that this thread again, but to see such utter rubbish being spouted does make me worry that one or two people might actually take you seriously when you attempt to come up with "science" that you have no understanding of.
I suggest that you go away and do an evening class in A level Physics and stop bothering us.
"Rather the body of the guitar will be forced to vibrate in sympathy with the sound in the room" - this is the very definition of resonance.
The bit about the 'very high impedance of the bridge / body interface' isn't correct, as proven when you put your ear on the body of the guitar and pluck a string.
Anybody here from Canada? Anybody here from Australia?
Tarporley? Anybody here from Tarporley? Stand up, all those from Tarporley and shake hands with the person on your right.
*An Official Foo-Approved guitarist since Sept 2023.
This was written by Wun Hung Lo and here's a helpful and quite erudite abstract which I feel solves the debate in its totality.
It's very hard to argue with this level of logic:
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*An Official Foo-Approved guitarist since Sept 2023.
As I said, I am not making this up of the top of my head, just reporting what I have read elsewhere. I think that, whatever the terminology used, it is perfectly true that an acoustic guitar is purposely designed to transmit as much energy as possible to the soundboard, whilst a solid-body electric is designed to minimise the transmission of energy at the body/ bridge interface, which is why it has better sustain. If, as you claim the bridge would 'therefore transmit almost all of the vibrations of the strings to the body' the guitar would have no sustain.
Here are a couple of the sources I drew on.
http://www.ingentaconnect.com/content/dav/aaua/1999/00000085/00000001/art00020
See also.
https://www.researchgate.net/publication/282789912_Fleischer_H_und_Zwicker_T_Investigating_dead_spots_of_electric_guitars_Acustica_united_with_acta_acustica_85_1999_128_-135
http://www.ingentaconnect.com/content/dav/aaua/2005/00000091/00000002/art00007
Etc. Etc.
May I respectfully suggest that the above authors are more knowledgeable than you, and your talk of 'rubber bridges' indicates that it is you who should 'go away and do an evening class in A level Physics'.
Cheers!
"Crucially, the body cannot be vibrated by the air in the room until the signal has already been generated and amplified."
Thanks!
By the way chaps, Mechanical impedance is a thing. It's quite legitimate and nothing to do with rubber bridges.
It's a complex thing though. Just saying a high impedance prevents vibration is wrong - there will be a small amount of string energy transmitted to the body, those of us who actually play from time to time will have felt it.
Unfortunately I suspect some people here are googling for advanced engineering topics and basing their debating points on something they first heard of over the weekend.
*An Official Foo-Approved guitarist since Sept 2023.
"Crucially, the body cannot be vibrated by the air in the room until the signal has already been generated and amplified."