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I second the Behringer or Crown amplifiers with dsp. My 15″ sealed ultimax extends below 20Hz. I can’t wait to see pics of your build. Spalted pecan is beautiful wood.
Recently, I bought a board for a monitor speaker project and realized the wood can be fairly weak. For a subwoofer, you probably will probably want to laminate it to some mdf or plywood. The pressures inside a subwoofer enclosure get pretty high.
