MartinLogan Descent [5/20] About the controls
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MartinLogan Descent [5/20] About the controls

MartinLogan Descent [5/20] About the controls
The Descent utilizes four controls that tailor its performance.
These include:
Low Pass Filter Switch
When the Descent is connected in multi-channel mode
(via its LFE input), the low pass filter is not active and your
processor handles most of the bass management. When
connected in 2-channel mode (via its left/right inputs) the
low-pass filter is active. The Descent low-pass filter is set
up to augment the bottom octave in the 40Hz crossover
setting. This is suitable for blending to MartinLogan and
non-MartinLogan products that have a rated low frequency
response below 50Hz. The 70Hz crossover setting is suit-
able for blending with MartinLogan and non-MartinLogan
products that have a rated low frequency response above
50Hz (bookshelf and on-wall speakers).
Level Knob
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
systems low end seem more extended and accurate.
Phase Control Knob
The phase control is entirely dependent on the size and
configuration of your listening environment, the placement
of the unit, and your seating arrangement. Due to the way
bass sound waves develop in different rooms, there is no
rule of thumb for setting phase. For Instance, if your room has
a peak at the subwoofer crossover area, you may wish to set
the phase so the actual acoustic outputs of the subwoofer
and main speakers are out of phase. Experiment, try differ-
ent settings and be patient.
25Hz Level Knob
The 25Hz Level control adjusts the level between 20 and
30Hz by ±12dB. 25Hz is a frequency where peaks and
dips of different amplitudes often manifest in real environ-
ments. This setting is dependent on room size, configuration
and personal preference.
The Descent also contains two controls that do not alter its
sonic performance. These include:
On/Off/Dim Light Switch
The light control switch allows you to adjust the brightness
of the illuminated MartinLogan logo.
Auto/On/Standby Power Switch
Please note that on the rear panel of the Descent, directly
above the AC power cord receptacle, there is a power switch
that is wired directly to the AC mains. This switch will turn off all
power to the Descent. The Auto/On/Standby switch located
on the front allows you to control the Descents energy saving
feature. When set to 'Auto', the Descent will turn itself on
when a music signal is detected and off when there is none.
The 'On' setting prevents the Descent from entering its energy
saving mode. The 'Standby' setting forces the Descent into its
energy saving mode. While set to 'Standby' the Descent will
not perform.
ABOUT THE CONTROLS
About the Controls 5
Figure 1. Descent Front Panel Controls

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