I'm looking at whether to consider replacing some Revel M16 speakers with M106. I've seen the reviews here, and some of the discussions, but I haven't seen what goes into the M106 to make it cost so much more than the M16. Is it a beefier construction? Better crossover? Better drivers? All of the above? Is there difference in distortion and frequency response noticeable when driven to 75-85 db at 6-10 feet?