As long as you have enough clean power to drive the Ascends at the desired volume, you should be fine. They will benefit from higher end electronics. My 170's run off a 1050 and play as loud as needed. There's a guy on the Ascend forum who is running 340's across the front and 170's in back ,with a Sherwood Newcastle P-965 and two ATI amps and loves it!
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It's all about the hardware!