I have an Harman Kardon AVR-235 with a pair of Diamond 9.5; it seems that the AVR cannot drive the full dynamics of these speakers; midrange is a bit weak too. I have listened to the speakers with some Audiolab stuff and NAD in the shop and Audiolab sounded more natural and had very clear midrange (while NAD sounded darker, but still more alive than the AVR). I wonder if connecting an integrated power amp like a Marantz PM-17SA or similar to the AVR pre-out would make sense... is the AVR pre-out good enough? Did anyone try something similar?