Regarding the THD specs, please see the post I just made in this thread
. One thing I am concerned with the Sony ES receivers is the fact that, according to third-party measurements
, Sony receivers consistently fail to deliver the rated power when multiple channels are driven simultaneously. The Elite 45TX performs respectably in this regard, delivering over 140W x 2 channels driven, and 135W x 5 channels driven according to HiFi News (UK) measurements. Not that this immediately makes the Sony receiver mediocre or anything, and its 5-year warranty is certainly a BIG plus... but the power issue is something to note about the Sony ES receivers.
The Yamaha 1400 vs. the Elite 45TX really depends on their price that you can get.