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Originally Posted by ZsX5o3
technically you won't have to grind the ribs down, but you will get a better sound if you cut a hole+mount a speaker grille over the panel.
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I built Essam's box with the Pioneer speaker. No grinding necessary. Experimenting with the cover on and off I sometimes thought there was a difference, other times I didn't. I think bass sounds go right through upholstery, seats, etc, but correct me if I am wrong.