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take a piece of 3/4" mdf that is larger than the port, glue and screw it over the port hole and it's sealed. You can't ruin a sub with a sealed enclosure, you can with an improperly ported enclosure because if it's not tuned correctly the sub will bottom out and self destruct. With a sealed box you will always have back pressure. If it's the incorrect volume it just won't be optimum, so it will take more power and have less punch.
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