I was very curious and contacted fishman.com. A rep made the following comments via an e-mail when I asked how it would be with a keyboard

"I'm an acoustic guitarist. I had a chance to try out the amp in a few different applications last weekend. One acoustic guitar / vocal solo gig at a small restaurant where it worked great. One small DJ karaoke gig, where I used it for two vocal microphones and prerecorded music. And one rehearsal, where I ran a small mixer with multiple vocals and instruments (including a Nord electric piano) through the item as a rehearsal monitor. I thought the sound of keyboards through the speaker was great, although excessive bass may have put a bit of a strain on the speakers. It did fine with the electric piano, but some of the dance bass heavy DJ music got farty if the volume went up too high. (I had it cranked trying to cover a bar with dance music). Of course, that really isn't the intended application, but it helps me to have a lot of experience with a product when I'm answering questions for consumers.

The speakers have WAY more bass than the Bose product on its own (without subwoofer) and gave excellent room coverage."