Kicker L7X Serie Benutzerhandbuch Seite 8

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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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