What
is a DCR?
DCR is short for Double Chamber Reflex. It is a little know
variation of a Bass Reflex. Unlike
a conventional Bass Reflex, where a single port determines
the lowest bass, a DCR has two ports, one for the lower
bass and the other for the upper bass.
The
manner in which this is accomplished is by way of 2 internal
chambers. In the larger chamber where the woofer is located,
the main port fires outwards for the lower bass. Simultaneously,
an internal port fires into a smaller chamber below. A third
port in this secondary chamber then fires outwards for the
upper bass.
It
is this added complexity that separates the bass performance
of a DCR from a Bass Reflex. With the assist of a secondary
chamber, a DCR is much more articulate in the upper bass.
It is equivalent to boosting the upper bass with an equalizer.
Instead of doing it electronically, a DCR does it acoustically.
In
the Near Field Response on the right, the outputs of the
2 ports are clearly defined. The green plot centered at
45Hz, is the output of the lower bass. The violet plot,
with a slight peak at 80Hz, is of the upper bass. Note how
well it bridges the gap between the lower bass and the roll
off of the woofer (red plot).
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