I think the whole 90/10% thing is sour grapes, for the most part. Yes, I have made some upgrades, but the concept of identifying a percentage increase in SQ strikes me as ludicrous. Make all the measurements possible, and you still can't quantify the whole presentation. My goal is simpler: to put together a system I can live with and enjoy long-term, in my space. One that enables me to just listen to music without annoying me. That isn't about largest size or highest price or what anyone else may think of the sound; I'll know I've gotten there when I keep a pair of speakers for a couple years without feeling the need to change them. My opinion is the only one that counts. I feel like I'm there with my amp. Since the speakers in my sig haven't yet arrived, I don't know yet if they fulfill that goal, and only time will tell.