While you are no doubt correct in that he would hear something different (whether it would be an improvement to his ears or not, I'm not sure), having heard both the M22s and the M50s, the tower speakers just have a fuller sound than the bookshelves. This is not to demean the bookshelves in any way; the only ones I've heard (the M22s) are amazing.

Did I avoid offending anyone?

I am the Doctor, and THIS... is my SPOON!