I received my May 2011 issue of Home Theater magazine today and it includes reviews of both the X7 (RS50) the X3 (RS40). The X3 review is by AVS Forum member Kris Deering and the X7 review is by Shane Buetter. They had a chance to do some side-by-side comparisons. I suggest you pick up a copy (or wait for it to show up online). I did note that while there were observations about the light output of the projectors there were no direct lumens measurements reported. Also it was interesting to see that their measurements for full on/off contrast ratio was essentially the same for both the X3 (i.e., 22,000:1) and X7 (i.e., 23,725:1). In both cases these CR numbers were with the projectors calibrated (i.e., dialed-in) in the configuration used for the evaluation of each projector. For the X7 this was with the aperature (dual iris) was set to -5, the lamp set to high and the setting of the zoom is not reported. For the X3 the aperature (single iris) was set to -6, the lamp to high and "near maximum zoom" was used. For the X7 it is reported that in testing for max. available CR the zoom was set to max. and the aperature was set to -15 and with the lamp still in high mode they measured a full on/off CR of 52,500:1. The max. CR possible with the X3 was not reported.
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