The problem is there is no way to replicate the sound from where the sawing actually transpired. In the courtroom, which is much larger than the bathroom would have been, the sound would be much different. Also, the sound would change significantly when the blade came into contact with whatever was being cut.
A chainsaw, or any saw, gets much louder when it has to power through the object being cut.
Anyone that has had construction in their neighborhood knows how annoying a saw can be. And it isn't because they are quiet.
Very, very good points.
I am glad the Judge did not let them take it back into the deliberating room with them, where they would have done who knows what experiments on it.