Yep
I had typed up a rather large post explaining the situation, but deleted it.
Moral of the story?
That 4520 has a very powerful amp, so even cranking that thing 1/2 way would be VERY loud on Ascend speakers without strain, these aren't 70DB sensitivity speakers...
Want it twice as loud? Find another place to live, become single, get ridiculous 1500W amp and new speakers.
That kinda power is for Subs, not mains/C IMHO.
My Denon 988 or my 110WPC(8ohms- 160W 4Ohm) Boston Acoustics A7200 will make my current room ridiculous- it's 13x13x7.5- my OLD room was MUCH larger, ~ 25x14x7.5- plus a stairway that went up stairs, and the Boston amp was really loud...but how much louder than the 988? I dunno, never even ran the Denon amp until recently(have owned it for 8 years)...I'm guessing not much, but maybe a lil better dynamics at very loud volumes...VERY loud.
Maybe I'm wrong, many tests of decent amps/AVRS tell me I'm probably not that far off for the most part.
Quality is the main thing,that 4520 is considered Denons flagship....I'm seriously doubting it has a crap amp, but I've been wrong before!