Most outlets in the US are 15A so they have a maximum of 1800 watts. Clas A/B amps like the 4800h have a rating of 660 watts or so but they can actually draw more because of the inefficiencies of Class A/B - I think some can draw a theoretical 1,600 watts.
The power consumption of the X4800H, according to Denon, is
710 W, same for the Cinema 40. I have no idea where you got the 660 watts figure from.
Your estimated 1600 W draw is meaningless, it is yet another common misconception that one can calculate the draw based on an estimated efficiency. The fact is, practically speaking the average maximum power draw by an AVR depends on how it is used. For example, in my case, the AVR will on average, draw no more than 2 A, or 7 to 8 A if you really push the unit to overload conditions. That's average, for the highest peaks it will be much higher, but such peaks are typically or very short duration that will not present an issue to the 15 A circuit, and besides, for such peaks, the AVR's power supply block capacitors (2X15,000 uf for the X4800H, or 2X18,000 uf (irrc) for the SR8002) can easily take care of those momentary peaks such that the wall outlet won't even feel it.
f have a console that's 250 watts, a tv ~100-200 watts and the sub can be an issue since they have massive RMS and peak power ratings.
I would not have been worried with an AVR + sub but I'm definitely worried about 2 AVRs + sub
Assuming your 15 A wall outlet is a dedicated one, there is nothing to worry about unless you push everything to their limits and risk damaging your hearing. To calculate, or estimate the adequacy of the power supply feed you have to consider the following, not just the "15 A outlet":
1) A typical 15 A circuit feeds many outlets, 6 or more will not be uncommon.
2) Not all outlets are fed by the same length of cables as it depends on their locations, the longer the feeders, the more voltage drop can be expected at any given load current.
3) For continuous load, depending on your local electrical codes, you should assume safely 12 A is the limit, not 15 A.
4) As mentioned before many times, power consumption figures are not the "maximum", for D+M, such as yours, I have provided link at least once to an article written by Gene, who claimed he got the information from Denon (or Marantz).
So, unless your 15 A wall outlet is a dedicated one, you have to consider loads plugged into the other outlets that are fed by the same 15 A circuit. If your electrical panel is labelled clearly, you should be able to get a good idea of how many outlets it feed. Again, as you said, your 2nd 8002 is used as preamp only so as long as your 15 A
circuit is used only for that outlet, you will be fine.
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