Originally Posted By: gonk
Trinnov does not add height channels. The R972 is a pure 7.1 receiver, without PLIIz or DSX to implement extra channels. Trinnov is a room correction technology, similar to Audyssey, that adds a function called "3D Remapping." This (in very crude terms) defines phantom speakers for each of the seven channels, located at the optimal positions around the chosen "sweet spot", and uses the seven physical speakers (each mapped in three dimensions by the calibration microphones) to create those phantom speakers.


This info from Curt Trinnov I found in a Sherwood R-972 User Thread (http://www.avsforum.com/t/1179978/sherwood-r-972-user-thread/1020#post_21675511): "Speaker placement: Yes, you can do height, or wides, as an example. Technique is to place speakers where you want more spatial definition, then calibrate. As we have more spatial acuity in the front, it makes a lot of sense in most rooms that are not long and narrow to setup a typical 5.1 array, then use the extra two channels for height or wides, or to fix a spatial problem. An example of this could be that there is a door, right where the left channel should go. The solution may be to place a speaker on both sides of the door, then have Trinnov correct the image. Same with height. If you have a low center, this can be off set by placing another speaker high. Requires re-calibration any time speakers are moved. When doing this, experiment with SPTL set to 2D and 3D for best results."