I have a Monza, which is the 10" version, it copes perfectly well with my 5 string basses and so did the Goodwood pre-production cab that I had on trial for a short while, so I'm sure the bigger driver in the Monaco will be absolutely fine.
it replaced an EBS2x12, which wasn't being worked particularly hard, but the Monza copes with a relatively loud blues band. Not tried it outdoors yet.