I'd suggest that, if you can, you move right up to XT32. There is a substantial difference between XT and XT32 - see the FAQ for more details. Currently the cheapest way into XT32 is the Onkyo 818 - it has been priced as low as $770 on special offer.
h)2. What is the difference between the various versions of MultEQ?
I'd suggest that, if you can, you move right up to XT32. There is a substantial difference between XT and XT32
There is substantial difference in resolution between XT and XT32 but this FAQ entry is a total lie for XT32 (at least on Onkyo 818) unfortunately:
Audyssey has simply 'listened' during the measuring phase and reported the -3dB point of the frequency response to your AVR. What this means is this: when Audyssey sends the test chirps it will measure the frequency response of your speaker and find where it starts to roll off (i.e. become 'less loud'). When Audyssey detects the point at which the frequency response is down by 3dB ('the -3dB point') it stops trying to correct for the in-room response. So if, for example, your speaker is -3dB down at 50Hz, Audyssey will detect that and will only apply the EQ down to 50Hz. Audyssey will not correct below 50Hz for fear of boosting the lower frequencies beyond the capabilities of your speaker and damaging it.
In the following example it will correct bellow 50Hz, moreover it will boost there for the whole +10dB and do it during almost 2 octaves bellow the -3dB point. Seems this is quite common, as it is confirmed by other people measurements.
And... should we do something with this FAQ entry? It is not telling the sad truth anymore!