I actually owned Cerwin Vega's years ago. They had horn drivers and as I remember were extremely efficient (more so than the M80s). You must either listen VERY loud, or there may be a problem with your amp. I have the Denon 3806, and I have never had a problem with it shutting down while driving the two M80s, one VP150, and four QS8s, even while playing music in the 90db range.

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7