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Re: correct enclosure dimensions and material?
1) yes, use 5/8" or 3/4" MDF (medium density fiberboard)
2) 12.18 X 17.4 X 24.36 = 5162 in^3 / 1728 = 2.99 ft^3
minus about .4 ft^3 for the speaker baskets. If you are giving us the interior measurements, then it's a 3 ft^3 box for all intents and purposes.
ft^3 means "cubic feet" .... in^3 means "cubic inches"
1 ft^3 = 1728 in^3 (12 in X 12 in X 12in)
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