(To paraphrase the well known car commercial.) I had a chance to compare my old GK 700rb-I with a 1001rb-II. The 1001 was in a new 210 combo. I set the controls the same on both heads and hooked them both up in turn to the 210's with GK's Speakon connector. Wow. What a difference! The older head was kind of wiry sounding compared with the new head. Sure, the 1001 has more power, but I wasn't playing them loud enough for this to be a huge difference. I know, somebody will say "headroom", but I don't think it was a major factor in this A/B test. The 1001-II was just more musical and deeper, yet clearer sounding. I sold my old head and bought a new 1001-II. I am awaiting a 210RBH and a 115RBH to come into my dealer. I will post a review of the entire outfit once I get it here. I am especially interested to hear if the internal electronic crossover is an improvement over using a passive crossover in the cab.