Like Mr Foxen says, you need a tweeter.
I've put a small church band through my MB 2x10 combo & it sounded good. It was 3 vocals, acoustic guitar, electro drumkit & either bass or another acoustic guitar.
It was a fairly small hall (@50 folk tops), so it wasn't cranked & it reproduced everything pretty good with no distortion or struggles. So go for it.
A few bass cab manufacturers suggest playing music through your cab at a reasonable volume for a few hours to break it in (I'm pretty sure it was an Ampeg booklet, though it might have been someone else)