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Date: May 22, 2012 at 03:36:07
From: kevyjo, []
Subject: Re: 18" sealed; interesting question

are you trying to fit an existing enclosure? i built a
modified version of this
sonotube-subwoofer-september-99.html, i think the
secret is to tune the port a step below the fs of the
woofer, the woofer i used was 19hz, i tuned one port to
17hz. the port resonates with the woofer an actually
stops it from moving, resulting in a breaking effect,
resulting in excellent extension (mine flat to 13hz),
but also excellent transient response and phase
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