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Is there some artefact to establish a broadcasting in my pushcart without having a pull a lunky biaural everyplace I go?

i poverty to modify the works speakers in my pushcart with factor speakers, and after that i poverty to add most sextet more speakers in assorted places in my pushcart what is the prizewinning artefact to do this without adding a subwoofer box. i do not poverty that actual blasting clunk that the subwoofer produces.