Avrs don't "power" subs, they just provide a pre-out, or even 2 but mostly they're just on an internal splitter when they have ".2" preouts, altho some higher end models can adjust for delay/level for two different subs. The format remains 7.1 or 5.1.2, if you're talking about speakers employed you might call it 7.2 or 5.2.2. Splitters externally on a single sub pre-out work just fine.
Not sure why you wouldn't want to somewhat do the same thing with Atmos as you did with the Denon.....
You are right. I shouldn't have said "I think it can power 2 subs". Instead I should have said, "I think it can handle connecting 2 subs.". And good point, with these technical things I need to be more careful about being accurate with things. Otherwise it can get confusing fast.
"Not sure why you wouldn't want to somewhat do the same thing with Atmos as you did with the Denon....."
I did try that. It wasn't as impressive sounding as a I was hoping it to be. With the Denon, I was using them as up firing speakers to bounce off my not ideal ceiling. When I sent the Denon to the shop a couple weeks ago, I swapped in the Yamaha using the same setup. Same results.
So I wanted to try mounting those speakers on the wall for "Front Presence / Front Height" as the Yamaha setup menu calls it. As opposed to "Dolby Enabled SP" with firing up, for the bounce effect.
Any suggestions for what that switch should be set to? Either "ATMOS" or "SURR". And why I'd want it to have it set one way or another?
I tired looking on Klipsch's website for info. But didn't find it. On some YT review on the speakers, one of the replies said,
"The switch is supposed to be set at atmos when the speakers are used as up firing. It sets the crossover at 180hz. When used as height speakers or regular surrounds you set the switch to surrounds.".
As you can tell, I'm a bit ignorant with this stuff. Though I can try it one way and then the other, to see what I like best. Though I'm curious as to the why behind it