@destopguy, @wspohn, I've owned three Vandersteen models and agree they are among the most musical and enjoyable of all I heard over the decades. One of the largest and earliest Vandersteen dealers is Stereo Unlimited in San Diego and they've had most models on floor for demos. I also bought a RM-9 from them to drive my last pair.
I remember seeing the 4s but don't recall hearing them. A bit of trivia. As he went through the numbers for new models Richard used Quatro for that sequence in the line up since he'd already used 4. If you've never met him he's a bit of a character, but a really good designer.

