I built another 2.1 @ 33hz box from some scrap I had lying around. Its 7 layer exterior (BC) plywood from Home Depot whatever that means. I did a double mounting baffle. I still prefer the density of MDF the heavier the better imo. I need to listen to it more but it does play rap/metal (Ice Cube, NWA, Metallica, Destruction) with authority though.