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13
OWNER’S MANUAL
English
Using and Adjusting the Descend Subwoofer
Amplifier Controls
Use the volume, phase and low-pass controls on the
amplifier panel to optimize your sound experience.
1. Volume up/down control knobs: Increase/
decrease the subwoofer’s loudness.
2. Phase switch: Adjusts the relative phase of the
output signal. Phase can be switched to either 0 or
180 degrees.
3. Low-pass filter up/down control knobs: The
adjustable low-pass filter can be adjusted from 40
to 140 Hz.
Adjusting the Sound
1. Sit in your favorite listening position.
2. Play a piece of music you are very familiar with
that has good deep bass content.
3. Adjust the Volume up or down to taste. The bass
should have impact without sounding too “heavy.”
4. Using the Subwoofer Low-Pass Filter Guide on page
14 as a starting point, adjust the LP up or down until
there is a smooth transition between the main speaker
and subwoofer. Play a recording with male vocals and
string bass. Turn down the LP filter frequency until the
vocals sound rich but not “thick” or “chesty.” Turn it
up if the vocals sound “thin” or lacking in body.
5. Flip the phase switch to either 0 or 180 degrees.
Then listen to how well the subwoofer blends with
your speaker system by how little you can tell the
difference in sound coming from your speakers and
subwoofer. This may also fix some unevenness in the
frequency response of your system. If you can’t hear
a difference between settings, it is recommended
that you leave the setting on 0 degrees.
In an ideal audio system the subwoofer works
“invisibly,” simply adding deep, loud bass without
calling attention to itself and blending seamlessly
with the main speakers so it appears that the main
speakers are making all the sound. The key to
seamless main speaker subblending is finding the
perfect crossover frequency and phase settings for
your system, and the best place to make those “set
and forget” adjustments is from your listening chair.
If your receiver has built-in Audyssey or a similar auto
setup/room correction function, run that first. In most
cases that is all the adjustment you’ll need.
Note: Auto setup functions work best when the
subwoofer is connected to the LFE/subwoofer output.
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