I just picked up this Fishman sub:
https://www.sweetwater.com/store/detail/SASub--fishman-sa-sub-300w-subwoofer-for-the-sa330x
It's a dream machine! Lightweight, compact, and rumbles my tummy with glorious bass. This box, and a pair of Bose S-1s will fill anything I do on a regular basis. I have owned many subs over the years, but for price, size, and WEIGHT - this one really shines. Lots of controls, handles one or two channels, and puts out 300 watts.
Using it at my summer swan song show tonight, and tomorrow, and I'll report back!
FINALLY - this summer schedule will give me a few days to rest up! June 4th was my last day off all summer. Not complaining - glad to have the work, but MAN, I'm tired.

Just an FYI - that Fishman stick (SA330x) is also a viable option for a kb/vocal rig, at moderate volumes. Add the sub, and it's works just great.