XT32 is the most advanced processing from Audyssey.. EQ XT being the next best..
AVR with XT32 have Sub EQ HT feature, which has the capability of EQ two different subs..
Here is some info, that is more technical..
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Oh that is huge upgrade in xt32, what would you say between yamaha 1070 and denon x3400h? They are almost same price range but yamaha 1070 seems more Powerful.