if the pioneer isnt up to the task, then the marantz probably wont do it either. You need to step it up to something in the realm of an Anthem at 200wpc. The Pioneer is a nice unit but when you put that much in one box, it does have it limitations as you've seen.
The right amp for my system
I have a Pioneer Elite w/130wpc and two Martin Logan Clarity at 200w w/ Acoustic Zen cables and a M/L Vignette for a center. The system lacks clarity and punch. I was thinking of adding Marantz MA-500 monoblocks. Is my thinking correct to improve the quality of sound? Should I hold out for more watts than what is in the MA-500's? $'s is a factor. Thanks, Married w/Children.