CA L C U L AT I N G VO L U M E
Calculating volume is merely a matter of measuring the dimensions in inches and using the formula: Volume = Height x Width x Depth. The result is in cubic inches. Convert this to cubic feet by dividing by 1,728 (the number of cubic inches in a cubic foot). If two facing sides are of uneven length, add them together and divide by two to take the average. Using this number will give you the volume without the necessity of calculating the box in sections and adding the sections together. The thickness of the baffle material reduces the internal volume so this must be subtracted from the outside dimen- sions to determine the internal volume. The speaker itself also reduces the internal volume. The amount of air displaced by each model is listed on the specification sheet and should also be subtracted from the gross volume calculation.
B U I L D I N G A N E N C L O S U R E
To work properly, the walls of the enclosure must be rigid and not flex when subjected to the high pressures generated by the speaker's operation. We recommend using 3/4" thick high density particle board or medium density fiberboard (MDF), which are available at most building supply stores. For a large box, internal bracing is needed for reinforcement. The joints should be glued and secured with either nails or screws; internally the joints should be sealed with silicon to prevent air leaking. Wood glue works best. Because the high density particle board and MDF are porous materials, it is suggested to seal the outside enclosure walls with polyurethane.
A 
C
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