[slewis]

As huge a fan as I am of the SA220, I don't think it's engineered to work optimally with keyboards, and my guess is that the Bose system would be better in that application. The SA is specifically designed (I've always thought) for the frequencies of the human voice and acoustic guitar. Their marketing message, too, I'm sure, has always conveyed that same idea. It's a great piece of gear, with features and performance that have worked flawlessly for me for quite a while, but with keyboards, I'd think you can find a better-suited system. Good luck; let us know what you do!