Does anyone use wood for vibration control?

Maybe not so obviously, the walls of an ordinary room act like a drum head whilst music is playing. This drum head action is separate issue from standing waves and reflected waves and room echoes. There are some things one can do to alleviate this particular interference to the primary signal from the speakers without going too crazy. Some of these techniques can be used for Windows, too.

Marigo VTS (constrained layer) Large Dots for walls.

Tekna Sonic Dampers (now out of production, unfortunately). The product for taming speaker cabinet vibrations works great for room walls, too.

Crystals (Brilliant Pebbles) are excellent vibration dissipators and can be used on room walls. You can find the maximum areas of flex 💪 on the walls by experimenting.

Golden Sound Acoustic Discs for room corners also work on things like room walls, power cord plugs, electronic chassis, etc.

Question- When a signal passes through a wire, the signal-for lack of a better word-flows from the source to the speakers. The electrons in the wire do NOT flow. The are stationary. But, they do vibrate. Doesn't the electron vibration within the wire cause vibrational distortion? And if so, how can it be possible to negate the effect of that vibrational distortion?

If an electron vibrates, which it might very well, even as a quantum particle, the total forces (sum of all f=ma) of the vibration of all the electrons in the wire would be very small compared to the sum of forces produced by acoustic waves and structural vibration, transformer vibration, etc. in the room. I.e., mass of an electron is exceedingly small. Thus, the sum of the electron “vibratory” forces is very small. So you can ignore electron vibration, assuming there is any. A similar question is whether or not the audio signal itself is vibrating AND whether it is vulnerable to distortion from local external forces.

Yes, the electron vibratory forces would be very small. But, since the electrons are inside the wire and is the signals transport system and the signal is flowing through-around, however- them, one could posit that this vibration would have an outsized vibratory effect that cannot be counteracted by any means. If the electrons are vibrating, and the audio signal is passing through them, how can it not cause the audio signal to vibrate? This could be another reason why your music playback system sounds so clear to you. Less wire and cables, less electron vibration in the signal path....

Let’s say you’re right, for the sake of argument. Let’s say electrons vibrate and let’s say they somehow distort the audio signal. But as you say, there’s nothing you can do about it. So, why worry about something you can’t do anything about? Especially in light of the fact there are SO MANY OTHER THINGS you CAN do something about. You might as well wonder why the signal of photons can travel at lightspeed through a solid copper conductor without being distorted by ramming into something more substantial than an electron, you know, like atoms and atomic nuclei. Follow?

At the same time less wire does mean less distortion caused by the directionality being incorrect 50% of the time. That much I will grant you. There are other losses and distortions in wire and cable, too. You know, dielectric material, purity and type of metal, geometry, etc. So, yes, less wire means less noise and distortion.