High School speakers for halftime music, on the track

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May 7, 2016
Our High School's PA system at the stadium is terrible for performance music and the school is not going to upgrade any time soon. I've seen cheer teams put speakers (on stands) right on the track that play good quality music for halftime performances. They need to be loud enough to reach the last row of the stadium and not blow out and connect to an iPhone.

Can anyone please recommend a good speaker for this purpose? Any music advice is appreciated.