By Mike Dougherty

PHILADELPHIA (CBS) – When speakers aren’t an option, good enough is better than not at all.

There is a little trick that keeps the party going on the beach, in the park or anywhere else you want to rock out.

There is no audio manipulation; you just drop your phone into an empty pitcher with the speaker facing down.

Dr. Youngmoon Kim, an engineering professor at Drexel, says there is a very simple explanation for why this works.

“It’s just redirecting the acoustic energy, the sound waves. You know, rather than only getting half of that acoustic energy, you’re getting a larger percentage of it,” he explains.

He says any rigid surface will get the job done, so play around with some of the pots, bowls or cups you have in the house. The big, red plastic cups work fine, just don’t expect Bose quality.

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