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 dimensions 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.
BU I L D I N G AN EN 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 (use non- flammable carpenter glue) and secured with either nails or screws. Internally the joints should be sealed with silicon to prevent air leaking. Because the high density particle board and MDF are porous materials, it is suggested to seal the outside enclosure walls with polyurethane. Ideally, the port should be located on the same face as the speaker and positioned at least one port diameter away from the side and back walls.
In Conclusion
Special care has been taken to ensure your satisfaction with the Punch Power Woofers. The materials and workmanship have been carefully selected to guarantee performance equal to the needs of the most demanding conditions. If you have any further questions or advanced system needs, your Authorized Rockford Fosgate Dealer will be happy to assist you.
4
