had a BRAINWAVE today ....
fancied trying out some of the new HD formats on a decent amp like the 59TXi - so was thinking analogue - but thats a right pain ...
suddenly I thought how about USB !

so carried my PC over into the lounge, plugged it into the 59TXi via USB - and voila 7.1 lossless sound from Bluray

! I was quite surprised it worked but worked it did. Limited to 48KHz (down-samples anything 96KHz or above) - but still lossless if the Bluray is anyway.
hadn't thought much of HD sound vs D.Digital/DTS on previous receivers (why I went to the 59TXi) -but on this receiver - RAW PCM and DTS Master Audio sounded sublime ..
even 2 channel CD sounded better oddly (whats Jitter like on USB vs Optical digital ?)
only disadvantage to using USB is that you can't apply D.PLII etc onto the signal, but as far as I could tell - bass management was working (well sub was on in 2 channel from the PC which implies it was) - and the speaker levels seemed to be working fine.
can anyone confirm that using USB input the amp is applying the speaker distance correction/delays ?
interestingly the HDMI output from the PC seemed to give a lot sharper (not bad sharp) PQ to my 11UK Plasma too - so that requires further investigation
anyway in summary was very impressed - anyone who still has a 59TXi its worth playing with the USB input - reason I hadn't consdidered it before was the 45TX I had previously was limited to 2 channel via USB - no so with the 59.

Mark.