Ok....let's see....
RF-7ii have a 101db sensitivity.
Double the power = a 3db gain in volume
1 watt = 101db
2 watt = 104db
4 watt = 107db
8 watt = 110db
16 watt = 113db
32 watt = 116db
64 watt = 119db
128 watt = 121
Looks like you will be able to enjoy about 8 seconds of that amp cranked wide open before you lose your hearing. I somehow "think" that Adcom would power your RF-7ii's just fine.
Keep in mind, a quality power amp will have a much easier time driving a set of speakers, especially when you get above 5 speakers. With a receiver, as you ad more speakers, you get less power from your amp. With power amps, you have the same watts / ch even when adding more speakers.
Yes...but you are wise in doing as much research as you can. Then and only then will you be able to make the best decision for you and for your setup.
I wouldn't say it's for no reason at all. Truth is....do any of us "need" an amp? No. Are there benefits of adding an external power amp? Absolutely. Are they night and day difference from your receiver? No. Is this all confusing? Yes.
i know that i won't be able to ever hear that loud... though some people say that the rf 7ii is not as efficient as klipsch labels them... i am actually only concerned about the bottom end, which ain't no concern with a separate amp but there is that itch that i should at least have the full capability under the belt, even though i may only crank it up full once in my lifetime... it is not actually research, i just am reading up before i have to buy them, as i still am about a week away from getting the money ... and why don't the avr/ avp makers tell these things in their specs. I have been trying to find the pre out voltages for the rca outputs of these two yamaha and marantz processors on their site and other forums but there are no proper figures... ah, i just don't want that extra 140 watt capability going to waste even though that will be less than 3db difference...