The B2 Sub is not powered, so it's not gonna do what you want to do. And, I suspect you need to work with your keyboard's EQ settings if you're not getting enough bottom end from the compacts. There are times when just using a single compact the bass is way too much and I have to make adjustments on the keyboard to reduce the amount of bass/bottom end.
I'll be more than happy to help you in any way I can to solve the problem you're experiencing,
Gary
Gary,
Thanks for the offer to help. Like I said, we will be keeping the compacts for the time being. Today, we have a small gig for which the compacts work well. Tomorrow, we will use the Yamaha in the larger hall venue.
We do get substantial bass from the Compacts in a smaller setting but they do seem thin in a larger hall...such as a church sanctuary.
I think it's probably going to take a year of using both systems...Bose and Yamaha to get a feel for what works best long term.
Again, thanks for the offer to help. We'll see what happens and I may be calling on you.
Thanks again.
Rog