Funny... I would expect the M40s to have similar characteristics to the M3s, with more bass extension. I think I've read posts to that effect. Do a search on all posts for M40 M50 M80, and you should come up with a comparison someone did awhile back between those three speakers. I wouldn't put the M50s in the category of just a good speaker though, INANE...

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