Right, got round to using the MRAC facility

, it was almost spot on, it was slightly out on the rears, but not by too much. Easy to use, there was a bit of ambient noise coming from the laptop, but once that was shut down, the whole process was finished in less than 3 mins. It set the subwoofer correctly too, but I just upped the level a tad as I prefer a bit more oomph
Currently watching Harry Potter and the Prisoner of Azkhaban, as this was the last movie I watched on the SR7400, so the experience there is more fresh. One thing that is obvious straight away is that last percentage of slam missing from the SR7400 is there on the SR7500, the THX mode is interesting, and isn't bad, flicking through the modes right now, and they all show a slight improvement. The soundstage is a tad more expansive, music performance is the same on the CD's I have tested, which is a GOOD thing
So far so good then, I have to hunt out my demo disc to run through common scenes, but tonight I'm going to sit back and relax, and soak in a movie or two.
Any downsides? Yes.......the facia build quality is top notch, but while setting it up, I noticed that the metal in the surrounding chassis is a bit thinner and prone to more flex than the SR7400, the rear panel also shows more flex than the SR7400. Apart from that, the build quality is top notch. The dials on the front feel better, and the damped flap movement oozes quality. The display is the same, so nice and clear, easy to read from a distance, and the mode the amp is in is easy to determine.
So, an improvement on the SR7400, but only where it needed to be. Still not as good a movie amp for slam as say, the Pioneer 1014i, but the dialogue and ambient quality has improved, and these were already very strong points on the old model. My personal opinion is that dialogue and ambience are more important movie elements, saying this though, the 'slam' is a definite improvement, and the gap has been closed a great deal on more 'exciting' models such as the aformentioned Pioneer.
Outright detail on movie soundtracks also improved, just as I was typing this, there were some bird noises in the Harry Potter movie I never heard before
Highly recommended, if anything, this shows the bargains people obtained when they bought the SR7400 at £400 and below
I am loving my new toy immensely
Anyone thinking of buying one will not be dissappointed.