I just picked up an Elementary, with 10Mohm impedance. Played a big banquet room (8,000 Sq ft., 250 people dining & dancing, military affair) last night with no FOH support, so my signal chain was Lifeline > Elementary > PJB BP200 > PJB C2 (monitor), BP200 DI and Remic > AI Clarus > 2 Acme B1s . B1s were stacked 10 ft in front of me with the C2 facing back. Sound was way better than expected, with plenty of headroom. The Elementary plays nicely with the Lifeline, and the AI HPF dealt with the boominess (we were in a corner, unfortunately). After 25 years of amplifying the big gal, I think I have a system that works beautifully. Many thanks to all the discussions I've monitored here - it's nice having other's experience to inform my own!