What does "good" sound like?

I'm not sure where this topic should go, but here's the deal....My old roommate had an Adcom 5400 on my Kilpsch kg 3.5's with a Yamaha receiver and player(don't know the model #'s). We went our own ways and I decided to buy another 2 channel amp. I loved the way the Adcom sounded, but that was all I had ever heard. I did a little research and found many people loved to mate Aragon with Klipsch. So I ended up getting a 2004 mkII. It sounds way different, apples and oranges. I had no idea an amp could sound different. The problem is I don't listen to what most people listen to on here. I listen to mostly alternative/hard rock. Plus, it's in a different room with different components and wiring, although my wiring is better. I have a Yamaha htr5250 receiver and I had a Sony dvd player, it crapped out. I used to dac's from the Yamaha anyway because I thought they sounded better. With the Adcom I could really hear the guitars, they really stood out. Now with the Aragon the lead guitars are set really far back and the bass guitar and kick drum are really brought forward. I have to say, I like the Adcom better. The bass was pretty weak but the mid's and hi's were so much better. It seemed much more "alive" as you could hear guitar plucks and finger slides and much more detail. The Aragon is much better through the entire spectrum though, that thing will slam. I had no idea those little Klipsch's would go so low. So what am I missing here? Is it just that the Adcom was strong in the right frequencies and was more suited to the music I listen to? Or could it be the dac's are different? The room is different, but I doubt that's it. I don't think I have the right words to describe what it is I'm trying to say. Like, do I need better mid range or top end? I kind of want to swap out the Aragon for an Adcom 5500, but I love the aragon with movies because it has such great bass. Any suggestions? Thanks.