PORTED ENCLOSURE
4
Building A PPI Ported Enclosure:
1. Build a sealed box with internal dimensions of LxWxD as specified for
your woofer. Use 3/4” thick material (preferably medium density fiber
board or equivalent) for box construction. Be sure to use wood glue and
silicone to ensure your enclosure is sealed properly, as air leaks will
affect the performance of a subwoofer. (The use of an air stapler will
help to achieve the nicest results for constructing the enclosure.)
2. Locate the supplied template and with an exacto knife cut through the
correct speaker outline for your woofer, following the printed lines.
Then, trace the appropriate circle and mounting hole pattern for your
PrecisionPower
subwoofer on the proper side for mounting the
woofer. Be sure to offset the woofer to one side to allow for the port to
fit comfortably.(See diagram)
3. Cut the speaker hole out of the box with a router. Use a guide or
template whenever possible for a clean, accurate job; use a jig saw only
if a router is not available. Drill out the mounting holes with a 7/32” drill
bit.
4. Locate the port material which you are going to use. Trace the pattern
of the appropriate hole needed for the port, then cut the hole out. When
installing the port, make sure you have a distance of at least the
diameter of the port from the end of the port to the wall inside the box.
To best seal off any air leaks use silicone around the inside edge. Also,
bevel the inside edge of both ends of the port to cut down on port noise.
5. Place the woofer into the hole which you have cut into the box to check
the fit. Make sure that the T-nut holes line up.
6. Install 10-24 T-nuts (not supplied) into the 7/32” holes from the
backside of the mounting board.
7. Run an appropriate length of wire into the box, leaving enough length
to comfortably install the wires to the terminals on the woofer before
placing the speaker into its mounting hole. Use a terminal cup when-
ever possible.
8. Vacuum out any wood shavings and dust that could find it's way into
the speaker from the inside of the speaker box. Line the box with a
polyester fiberfill blanket or fiberglass insulation about 1” thick.
9. Apply the foam gasket to the speaker to ensure a sealed fit.
Be sure that the mounting holes line up.
10. Connect the wires to the woofer observing the proper polarity,
positive and negative terminals. Strip away the insulation of
the wire about 1/4" and install the wires into the terminal posts.
11. Install the woofer into the box using the provided 10-24 bolts.
12. Once the box is completed it is time to connect the speaker wire coming
from the subwoofer enclosure to your amplifier. Check that you use the
proper wire for consistent polarity, positive and negative.
(Refer to amplifier owner’s manual.)
13. Finally, sit back and enjoy to the incredible enhancement your new
PrecisionPower
subwoofer brings to your audio system.
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