I have been disappointed with bass levels for a while, with the overall sound lacking depth. I have put up with it thinking that a speaker upgrade was the probable solution. The missions are my first standmounts and i had presumed that the physics of having smaller speakers was the cause of my dissapointment. Today however, i thought i'd dust my spare Technics amp (su-a808 ) off and give it a try in place of the pioneer. I don't think this amp was well reviewed even when i bought it new for under £300 about 11 years ago but i'm amazed with the results. So much more body to the sound. OK, so it's lacking some top end sparkle and voices don't sound as natural but i'm relieved to find my missions maybe dont need replacing after all. The bass, although not matching the level of a floorstander, is certainly adequate for my smallish room. Just enjoying some Tool at the minute and the sound has so much more drive to it than it did with the a400. I have read many threads and opinions stating that the pio and missions were a great match so either i have a faulty unit or i just disagree with them. I'll soon be on the hunt for a replacement for the pioneer so any ideas new or used are welcome.