Nowadays everybody is doing automatic calibration. But not everyone is doing automatic equalization the same.
From what I can read, the OP doesn't intend to complicate his son's life with manual parametric EQ (you need sophisticated instrumentation to do an adequate job).
Audyssey MultEQ is more advanced, and fully automatic (pure simplicity) and efficient (it works better than those other Auto Room Calibration and EQ systems).
To have Audyssey MultEQ and Audyssey Dynamic EQ and Volume in a $300 receiver is simply mind blowing!
...Plus all the other stuff that it has (just check that link above)! ...And plenty of HDMI inputs (6 In/2 Out).
* Two-year warranty (brand new).
Shure, he can get an older/used receiver like the Onkyo TX-SR805, or TX-SR876 (2007-2008 models, and both with MultEQ XT, and THX Ultra certification) for roughly the same money; but in what true actual condition, and guaranty? ...Two real power (true RMS watts with all channels driven) monsters, but no need with Klipsch speakers. And! ...No Ethernet port plus none of all the newest features of a modern receiver.
<<>> A sub is important too.