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This 3/8" MDF panel is cut for an 8" speaker, and replaces the existing speaker mount in a WPC cabinet. It has holes for recessed WPC-style speaker nails, and can be screwed, glued, T-nutted or stapled into the cabinet bottom.
Remove the old panel with a chisel. Use an 8 ohm high efficiency speaker (92dB+, and 40 - 50Hz Vf), and you'll get much beefier bass.