I have the full tower Impression series 7.2 with two ES10i Subwoofers using 3 pairs of E55WI Surround On-wall Speakers (I guess that's 9.2?). That's 500 watts of subwoofer amplification. EMP has the ES1010i on sale today for $399, that's $800 for a pair. Bang for the buck, is it a worthwhile upgrade to go from a pair of ES10i subs to a pair of ES1010i subwoofers. My electronics consist of the Marantz AV7003, MM7055, MM7025 X2, SA8004, OPPO-93 and Panasonic TC-P65VT30 Plasma TV. Room size is approx. 12x17x10.