replacing Dunlavy SC-IV's

I have also owned the 4s. I have sold them and since moved on. The 4s are a very evenhanded speaker that doesn't do to many wrongs, while in my opinion they don't do a lot of things spectacular. I would skip the 4as or the 5s, they just sound to much like the 4s in my opinion and the 5s are gigantic are require a big room.

If you are going to stick with your current electronics I would reccomend you listen to the Silverline Bolero, I have a hunch they might sound really good with your Accuphase amp. I own the Sonata and have directly compared them to the 4s, while the Sonata seemed to have more issues than the 4s they were much more exciting and spectacular. The Boleros should be better, I heard them at the Home Entertainment show and they were sounding very good.

I agreed with Duke that there are many things to cosider when choosing top notch speakers, mainly for you would be the system and room you are matching them to

I also replaced my Dunlavy 4s with the Avantgarde Duos and couldn't be happier, the Duos are a major commitment of time and energy to get them to sound their best, but when you do they are magic. The Duos are so much more spectacular than the 4s, but can be problematic and frustrating if not set up well.