Rockford Fosgate PWR-810 - Manual (Page 7)

4
C
A L C U L AT I N G
V
O 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.
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 (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.