re: Overpowering PA Speakers?

To piggyback off of EA6B, you are much more likely to blow your speakers by underpowering them due to all the distortion induced by running at or near the max power output of the amplifier in an attempt to, "Turn it up dude."

Can you still pop them by over powering them? Sure but I doubt it will be an issue.
So that Behringer head is rated at 350? Well that's 175 per channel. At what ohm rating? Most likely they rate that at 4 or even 2 ohms in order to make that number appear bigger for marketing purposes because "More Power!!" So realistically depending on what resistance rating your speakers are, most likely 8 or even 16 ohm, your amp is probably only pushing around 80 watts per speaker.