duct tape the end of your PA speaker wire to an unfolded metal coat-hanger then spear that holes expanding foam filler with this to drive the wire thru, unduct-tape and extract coat hanger with your wire attached to something to retain it . As Gunny said, the cowling holes for this exist upon both sides. You dislike this , get a hole saw or use floor access ports
<sorry, USMC ; I failed to notice that last suggestion you 'd made about coathanger. my bad>
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