Keep in mind that your 250 watt rating may be at 8 ohms...or it may be at 4 ohms. You do need to find that out. If you're using 4 ohm speakers, and the amp is rated for 250 watts into 8 ohms, that's a big difference. Although, in my opinion, that's more ideal than underpowering a speaker to begin with.
But don't necessarily assume that adding a second pair of speakers is going to make everything sound better. If the room isn't big enough to need the power, or the coverage, then don't use it. You'll end up creating more problems, especially if you don't know much about sound.
Since it sounds like you're using a powered mixer, odds are you're short on features. Especially if you can't even bridge mono. That makes me think this thing can't handle a 2 ohm load....so be careful how you wire these things up.
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