The Dali Helicon 400 is a very nice sounding speaker. Hearing a pair of those was among the final nails in my obsession with vintage speakers. They are really really good. Big, full bodied, balanced with a sweet top end that is not at all strident, at least not on the tube gear (Cary and Rogue) that I heard them on. I can only imagine that a company that can make these speakers, has a history of making nice speakers. I've seen a few older Dalis and have always been intrigued. Let us know how they sound, if you would.