The drives are mounted with very small shock absorbers, yes. But the system is meant to tolerate normal street driving, not off-road or extremely bumpy situations. Your description sounds like it's in between the two.

I don't know of any way that you can give us a good idea of just how bumpy your cobblestone streets are. I think this is a borderline case, and it's going to be hard to give an opinion. I do know that it's going to tolerate bumpy roads better than a CD player would, but I don't know how much better.