I’ll toss my vote in for the Zu’s too. I have a SET 300B that I use with my Zu Soul Supremes. I listen to a ton of live Dead (Dave’s & Dick’s Picks and all the box sets). The Zu’s throw a great soundstage (and aren’t bright). I couldn’t be happier but I would love to try the Volti Razz in my room, but I really don’t see it happening.
I’ve been living happily with the Zu SS’s for about 6-7 years. I’ve used different amps, First Watt F8 and SIT3. Depending on your amp you might want to get the impedance wrangling resistors to make them look like 8 ohms to your amp.
Enjoy!