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NATURAL SOUND SUBWOOFERS AW831SE / AW1051SE / AW1251SE / AW1571SE PLEASE RETAIN THIS MANUAL FOR FUTURE REFERENCE...
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Box Parameters Audiobahn Box Specifications All ports listed are circle ports unless otherwise stated. Surface area of a circle port = (3.14) X (radius) (squared) Remember to build your box to the total volume, not just air space, as total volume includes all displacement.