Thanks for your reactions!

I have already tried to insulate my current small speakers by putting them on a few folded towels, and this seems to help a little I guess. I was indeed thinking of putting the m60s on spikes, and use little pieces of rubber to put between the spikes and my wooden floor. This nickel-advice is also a good one, thanks!
I can apply layers of carpet, but this is not going to look nice in my living room, so I prefer another solution.

Oh yeah, she's not an old bat but single and about 32 of age Not a bad idea to invite her to my place when I have my new set and put on a Phil Collins or Coldplay CD or something, maybe she'll loosen up a little concerning my music...