The original fans of Bill Johnson's designs, like the State-Of-The-Art SP-10 pre-amp and D-79 power amp, were dismayed when he handed over a lot of the ARC design work to Rich Larsen, who was largely responsible for the hybrid SP-11. That pre-amp ushered in the "dry/white/bleached" era of ARC sound. It's not that they didn't know who was doing the ARC design work, but rather that they did---Rich Larsen, not Bill Johnson. Rich's hybrid sound has obviously improved a lot since then.