This won't help much, but at least the letters "Re-Eq" are now well identified to be a THX trademark! (no kidding).
Onko Asia's Web-site (I have an 805) says the "very helpful"
Movies are mixed for large cinemas, where the speakers are placed farther away from the listener. THX Re-EQ re-establishes the accuracy of the tonal balance for close-range home theater speakers. Without THX Re-EQ, higher frequencies sound excessively edgy or bright."
Too bad they don't mention EXACTLY which frequencies and by how much. That would allow you to either just play with trebble settings or, if you have an equilizer, use its more precise knobs. You may want to look it up on THX web-sites (if such a thing exists).