I'm a big fan of Mike Dzurko and ACI. I've had the pleasure of hearing the latest version of the Emerald's just a few months ago, for a couple of hours. IMHO, the Era D5"s aren't in the same league even though they produce a deeper bass by some 20hz. The mid bass, mids and highs are far richer, more detailed with the Emerald's Since I heard them I've read two reviews and I couldn't agree more.