Kicker SoloX L7X Series Owner's Manual page 8

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Do not install a port opening against a solid
surface, such as an internal brace, back-
panel or trunk wall, seat or interior panel of
your vehicle. The port opening must remain
unobstructed. Use the smallest dimension
of the rectangular port as the minimum
amount of space between the port opening
and any solid surface to ensure unrestricted
airflow.
You can loosely fill your enclosure with
poly-fil stuffing. Ported designs will require
covering the end of the port (located inside
the box) with grill cloth, chicken wire, or
expanded metal to prevent the poly-fil
from exiting the port. The use of poly-fil will
slightly decrease efficiency, but will deepen
and extend the low frequency output by
making your subwoofer think it's in a bigger
box.
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