Yeah, I saw that. The 4300 and 4200 weigh the same and the 4300 has an extra channel so I'd expect power at all channels to be a little lower, but nothing that I'd ever notice. I like to see the ACD spec, but I know that situation won't ever come up in the real world.
Not really, I thought the x4300h is a lb heavier and power consumption is higher at 710w vs 670w.
Normally you cannot compared output based on consumption between different brands but between the x4200w and x4300h you definitely can.
Edit: Now I know what happened, if you look at the product sheets, they are both 27.8 lbs.
If you look at the manual, the 4300 is exactly 2 lbs heavier.
X4200W - 27 lbs 12 oz.
X4300H - 29 lbs 12 oz.
It makes sense that the X4300H is 2 lbs heavier because is has two more channels of amplification and the power supply is slightly bigger.
The Marantz SR7011 is 31 lbs 1 oz, that is 1 lb and 5 oz. heavier than the Denon. Again that makes sense because it has 7.1 channel analog inputs and therefore a larger enclosure. The power supply appears to be the same, with exactly the same power consumption figure as the X4300H.