| Wonderful small combo, and I love it for DB and more old school tones.
It should not surprise you that a single 112 with no tweeter in a very small sealed cab would be almost all mids and very little else. That is the signature tone of those small combo's, and it is why many DBers love them... controls the 'bloom and click' automatically if you are going after a more old school DB tone.
The solution (assuming you want to keep the combo) is to add a 112 extension cab with a tweeter, for those times when you either need more volume, or a wider tone (i.e., more true low end and more upper treble).
A warning... for some reason, many of these MB150 combo's have the speaker wired 'backwards' (i.e., positive to ground and ground to positive). That is a zero issue when using it on its own, but results in the internal speaker (often) being 'out of phase' with an extension cab (i.e., the cones will be moving in opposite directions, resulting in all the bottom disappearing). Don't freak out if this happens... just switch the wires on either the combo speaker or the extension and you will be good to go!
Hope that helps. | 
