For all NEW audio enthusiasts, I recommend reading back issues of The Audio Critic for free online.
http://www.theaudiocritic.com/
Then you will know the TRUTH about amps, preamps, AVR, DAC, cables/wires, etc.
For AVR, all the measured specs will look great, even the cheap $300 AVR will have great measurements as far as the usual SNR, Crosstalk, THD, Frequency Response.
The only spec worth noting these days is the POWER output. For example, 100 watts per channel x 2 Ch into 8 ohms, 80 watts per channel x 5 Ch into 8 ohms, 150 watts per Ch x 2 Ch into 4 ohms.
Next you look at FEATURES like Audyssey XT32 Dynamic EQ, AirPlay, 4K video, etc.
For someone like me, I would never buy anything without Audyssey XT Dynamic EQ, which means Denon, Marantz, and McIntosh.
For others, it may be ARC or DIRAC or YPAO, etc.
Then it's the price. If you can get an awesome $1,500 Denon AVR for $750 brand new delivered from an authorized dealer, why wouldn't you buy it before the sale is over?