I think you can compensate for whatever frequencies are affected by using the EQ on the remote control. If it's being used loudy, then there is no trouble with mono .... the air will force it to all corners of the room. If it's quieter, then the kb speakers ( if you got 'em! ) will progect a stereo image in the neqr vacinity to the performer. It will enhance the signal coming from the Bose and make a very full package.
Everyone .. stop READING, and go PLAY this speaker system!!!!!!!!!!! Forget anything you read about it (even by ME!)..... and go EXPERIENCE what it can do.
I had mine in a room full of mirrored walls tonight - no feedback, and even clearer "sizzle" .... it wqs really great. The best sound so far, since I got it. It sounded like I had headphones on all night. It was THAT present in my vantage point.