I've read that some people have replaced the crossovers in their M22 speakers to reduce some of the sibilance they have heard when listening to higher frequency audio.

Let me first say that I'm using M3 speakers and don't have much a problem with shrill sound from these speakers that I've noticed. Then again, I haven't had a lot of experience with different sorts of speakers so I have no idea weather or not they sound harsh to others.

The reason that I ask is because I'm using a purely digital receiver (panasonic XR-55) which has a very cold sound to it. I've read that this is rather a bad pairing for speakers like the Axioms. My thought was to change the internals of the axiom speakers to make them sound a bit warmer. Has anyone gone about doing this and can advise on how to proceed? I'm quite technical minded and have experience with electronics though I don't have any experience with speaker electronics.