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C
ONTROLS AND
Accessing the Control Panel
The control panel is located behind the inset metal plate
located on top of the subwoofer. To access the control
panel, gently press the area above the MartinLogan logo.
When the spring releases gently pull the metal plate away
from the subwoofer.
Control Panel
Level
Setting the level too high will cause the bass to seem bloated
and is the single most common cause of bad sounding
subwoofers. A rule of thumb is that the subwoofer should
not draw attention to itself, but should simply make the
system's low end seem more extended and accurate.
Low Pass Filter
When the Descent i is connected in multi-channel mode
(via its LFE input), the low pass filter is not active and your
processor handles the bass management. When connected
Figure 1. Top control panel.
6
Introduction
C
ONNECTIONS
in 2-channel mode (via its speaker or line level left/right
input), the low-pass filter is active.
As a general rule the Low Pass Filter should be set at the option
approximately equal to (or below) 70% of your main speaker's
lowest frequency response. Example: The MartinLogan Vista's
lowest frequency response is 43Hz. 70% of 43Hz equals
30.1, so you should set the Descent i's low pass filter to 30Hz.
Remember, this is a general rule. We advise that once you
try the recommended setting using the formula above, you
should try the surrounding settings to see which sounds best.
Optionally, an internal module in the Descent i can be
upgraded with a custom tailored Low Pass Filter setting
for use with the MartinLogan CLX loudspeaker. When this
upgrade is implemented the 30 Hz setting on the Descent
i becomes the CLX Low Pass Filter setting.
Phase Control
The phase control is entirely dependent on the size and
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