Rob, what is it you want to achieve?
If it's to drive your OB's with one stereo amp then no, you'd need to use two amps (assuming a two way OB).
One amp would drive the mid/top driver and the other the bass. The minidsp would act as the crossover, you can set this as you please. When you buy the unit, buy the software to run it. Dead easy to use via a USB lead, and you can alter the crossover on the fly, so easy to tune.
“Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”
Hunter S Thompson