It seems odd to me that it requires a better speaker to cope with what by all accounts is a CD that is not particularly well produced (comparatively). It seems to me (but I am a beginner) that everything in the chain has to be at a certain quality level to achieve optimum SQ.
But, maybe SQ is not the right term. This CD might have the exact SQ U2 was after but the SQ they were after is what you would hear in a giant room full of dancing people with throbbing, pulsing base where subtlety has no place. And that's just not my taste anymore. And worse, I hear people talk of 'listening fatigue' and that seems to be the effect I get from this album.
Anyway, my speakers seem to be in the right position for well produced sources like Aja, Dire Straits, Wish You Were Here, Hemispheres (Rush) and the bulk of what I listen to, including a number of classical pieces like Saint-Saens' Symphony No. 3 for organ with its literally room shaking bass that is still clear and precise.
My speakers weigh #120 pounds and are on spikes. I could try to get them even further out from the wall but that seems like a lot of trouble.
I am also not in this hobby as a pursuit of anything greater than what I already have. So the equipment I have is all there is going to be. So I'm stuck with U2 as they are as well I'm afraid.
But, one afternoon when I its rainy outside and my wife isn't home I might just attempt an Achtung Baby system tune up and move those speakers around and even some furniture!