I see they have Pro Series Eminence speakers in them. 600 watts!!!! They are tuned to 50hz and I'm sure take alot of volume. How would I know from looking at the specs if they are efficient? What is a number for a 15" spec that would indicate efficiency? Are these cabs in the same class as say Peavey,Classic Series Ampeg... and targetting customers in that price range. or Are they actually a step up but are kept affordable due to direct factory shipping ? Because of "No middle man". Is this a hidden jewel or basically another option in the Peavey type class of cab? (not that there's anything wrong with Peavey,I've owned a few)but lets face it Peavey and other companies "more affordable" series aren't tuned and engineered like their top lines. But may still be fine for me.