What is in those boxes?

I have heard all the cable arguments and I am an objectivist. I admit anything that a DBT devotee wants to claim. I admit that I'm altering the sound from the true definition of "hi fi" and I've made peace with God about that. I expect that whatever MIT does, it is "adding distortion" by definition... OK?

So with all that out of the way, I have a very lively room and MIT speaker cables have improved my enjoyment of the system.

Can anyone tell me objectively/factually what is the deal with the boxes? In layperson terms can someone say what they purport to do?

Thanks.