R-972 Update
On my 972( which has the latest firmware, 1.34 ), I have found that you cannot assume that all 3 Trinnov Positions are the same. They seem to have different initial states, because from precisely same mic position and speaker setup, different Trinnov Positions calibrate differently. So if you get an unsatisfactory calibration with Position 1, try using Position 2 or 3, and you may get lucky. I did. Before reading a post on another 972 user thread( at HomeTheaterShack.com ), I had never considered the possibility that, given exactly the same experimental setup( mic/speaker/room ), different Trinnov Positions would calibrate differently, but on that thread, a user who calls himself Matteo, having failed to get any subwoofer output with Position 2, simply recalibrated the same setup( his sub is built into the room, so he can't move it ) at Position 1 and the bass response mysteriously re-appeared.
With my 972, Position 1 gets the speaker mapping right, but gets the levels wrong( especially the sub, which is too far down ), Position 2 gets the mapping( geometry ) wrong, but gets the levels right, and Position 3 gets both the mapping geometry and the levels right. If the sub is underfed to the extent mine was at Position 1, none of the Room EQ options have much of an effect, as they are swamped by the over-bright level settings. With more accurate level settings, the Trinnov Room EQ is usable and audible, though you may still opt to turn it off. To my ears, Trinnov Room EQ( with 4 built-in target curves ) is similar in effect to Audyssey Room EQ.
The moral for 972 users: if you can't get it right with one Trinnov Position, try another one. The different Trinnov Positions are supposed to be used for different seating positions, but in my unit only one Position( 3 ) works, so can only get a correct calibration for one seating position.