Unfortunately you can't. We watched Wishes twice last year from the Poly beach and my DH and I both said that it would be nice if they had some speakers outside for the music.
Are you staying at the Poly? If so, are you staying concierge? Reason why I ask is because if you are staying concierge, the music is piped into there lounge area and they have big windows that face the castle.
Even though the music isn't there on the beach, it is still peaceful to sit on a chase lounge chair in the quiet night air and watch the fireworks from a distance. Then afterwards, you don't have to fight any crowds to leave.
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