I had a 1998 4003 for a while. When I got it, it had some kind of dead rounds on it. I put TI Jazz flats on it. That was good up to a point, but I found it had a bit of a scratchy sound to it. Then I put a set of DR SunBeams on it. Much better. I think it would probably sound pretty good with EB Cobalt Flats, since they sound a lot like broken in rounds once the initial zing wears off. I really didn't like the way the Ric sounded with brand new rounds on it. There were other things that kept me from bonding with it completely, so it's gone. Nice bass, though. I just didn't like it enough to keep it.