I would consider replacing my Model 990 for a R972 if it gives me an improvement in sound quality, with and without Trinnov enabled. My speaker lay out is pretty close to ITU 5.1, with almost equal speaker distances (7' to 7,5'). My interest in Trinnov is to be able to heighten the soundfield for movie watching, using additional height speakers. Not at the expense of giving in on sound quality though...
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.
So on sound quality would the R972 sound better then my 990
I don't know because I've never used an R972. There are a couple R972 owners around here, though, I think - they might be able to offer first-hand experience.
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