Some questions first:
1) What player are you using?
2) Are you using the built-in test tones on the the 1050 to balance out your system? In other words, do you hear the volume change in your speakers with the test tone or with just musical material?
3) Are you using a SPL meter to achieve the right levels or are you doing it by ear?
4) Do your speakers work out to be equi-distant from each other or is one much farther away than the others?
Just trying to chase down where your problem may be. Kinda tricky when you can't hear the issue in person but will try.