Chess, I am sure there's a list but of course we're not privy to it. However, anything on that list is higher priority than stereo drivers separated by a distance of 16".
Let me tell you, the v4 is a different animal. Look at my thread on "out with the old in with the new". I suppose it depends on your tastes somewhat. If you don't care about wider and deeper sound-stage and vastly improved clarity and image focus, then don't bother. But last night was very telling. My friend who doesn't give a second thought to sound, found the whole "audition" extremely enlightening. She's gone from not wanting any speakers to thinking about how to best integrate M3s into her space.
