I've always been wary of the THX Optimode tests, ever since they first appeared on some DVD's with the rather odd qualifier that they were customized for the movie they were attached to. Instead, I've generally relied on my receiver or pre/pro's internal test tones, although I've also used Video Essentials a couple of times. Either of those methods would be a better way to calibrate a system for general use than the Optimode test tones. Here are a few links discussing THX Optimization and THX Optimode:
SMR Article THX info page TechnoFILE article The first link is of particular value in this case, as it discusses the limitations in Optimode. It's best summed up in the following quote:
they have recently stated that the Optimode calibration noise should not be used to assess the output levels of a system
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