I know many of you swear by stereo, and I admit, there are aspects of the separation that I too, enjoy. There is, however a real issue with line array setups, like the Bose, Eon1, Maui etc when frequencies cross in the center. I've always enjoyed my vocal harmonies separated, but there is little else that I "need" to hear in stereo. I've tried many times to make the stereo deal work for me, and quite simply ... it doesn't work in my rooms. One tower sounded better than two almost always. Example:
I work a noisy, crowded shore resort that has all the acoustic properties of an airplane hanger. Great job, but horrible acoustics. I've used literally dozens of combinations in there, and nothing covers as well as a single Bose tower.
I DID, however have a revelation last week that improved my sound ALOT.
I found the sweet spot for my Compact tower, and placed the second Bose base unit only (no tweeters connected) in a corner of the stage. I fed the bass unit from the headphone jack in my teeny tiny mixer. This gave me the option to add or remove bass from the total mix without altering the general volume. It really filled up the sound at lower volumes, and added the extra ooomph for dance tunes later in the night. The Bose sub unit is just the right compliment to my PA900 speakers at very low volume, and adds even more when the full tower is engaged.
So, I now run only one upright column, but a dual mono bass. It's soooooooo good.