Bill, I have no problems using a single Bose L1 Compact - the overall quality is superb, lots of bottom end, and I've used a single with audiences to 100 with plenty of headroom to spare. Keep in mind, though, the L1 Compact has no EQ/Tone controls for the main input - and just a 2-band EQ for the separate mic input. My audiences tell me that my vocals sound better than they have in decades, and I can only attribute that to the combination of my S950 vocal processor, the TC Helicon Harmony-M vocal processor and the Bose L1 Compact.
All of the EQ settings are done at the keyboard, which is also where my mic inputs as well after going through my TC Helicon Harmony-M. I've only done a handful of larger parties where I needed to use two compacts and believe me I could have blown the walls out of the place. The bottom end was so intense on some line-dance MP3s I played I was worried that it was too much. I fired up an MP3 of Moves Like Jager and the DJ in the next hall came in to see MY system - he was so impressed that he ordered a pair of compacts the next day, and called to thank me.
As for taking the keyboard to the store - NAH! I can't think of a worse scenario than a cluttered music store, especially a GC, which is the only place I know around here where you could audition one. The acoustics, noise, etc..., couldn't be worse. Fortunately, Bose, when buying direct, and most GCs has a no questions asked return policy, which will allow you to use the product in a live situation and make a valid evaluation under the right circumstances.
The last time I checked, you were using a Tyros2 and L1 Standard and single bass unit - I assume that's still the case. Overall, that's a pretty heavy rig to lug around every day of the week. If this is still the case, you may wish to talk with the folks at GC. They gave me a great deal, traded even up for my L1 Standard that I had used for 4 years, for a new L1 Compact. I sincerely believe you will love what you hear, but if not, you can always return the compact for a full refund, even after using it for a month.
If you're still lugging around that heavy, bulky T2, I would seriously consider switching to the PSR-S950, which I believe is pretty close to a T4 in many respects. It's very light, not at all bulky and easy on an old man's back parts.
Good luck with whatever you decide upon,
Gary
