I recently bought a bluetooth speaker which is exactly the size of a water bottle so it fits perfectly well in one of my bottle cages. However, I noticed that while I'm stopped I can feel the vibrations from the bass really well in my contact points (feet, butt, hands too).

I do not notice any difference when I'm on the move, which tells me that the vibrations are relatively minor compared to road buzz.

My question is whether these vibrations will shorten the lifespan of my aluminium frame and/or carbon fork?

I don't think so, as road buzz causes much greater vibrations, but maybe the two put together will do something? Just checking.