Alright well I have the Behringer EURORACK UBB1002 10-Input Mixer and I was wondering if i could plug a mic in and send the main out to a speaker and it would work. I don't have much money for a PA system so if I could just get a speaker or two and use the gear I already have that would be ideal. My only question is there any reason this wouldn't work?
It would work if you had powered speakers

or an amp and passive speakers... your choice.