If you like them against the wall, try moving them out a couple of feet and leaning them back right on the wall. It does nothing for the bottom octave but brings up the bass a hair, AND lets them handle a wee bit more power. I shit you not, I think the woofers are powerful enough that the mass of the cone makes the whole cabinet move to and fro on heavy bass which allows it to bottom out just a bit more easily. Giving it a solid surface seemed to let you get a couple more dB before bottoming. Yes, I pushed them and now all the drivers have been changed. Believe it or not, because I had a company from which to order I got all four drivers for about fifty bucks ! I couldn't believee it, but when the package came the proof was in there. If I knew then whay I know now I would have bought a hundred of those (series three) tweeters, and a few mmore woofers as well.
Anyway, the A-70s are kinda hard to beat. I got rid of mine when I got the A-150s.