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On the rear panel of the X2 is a 3-position switch that determines the trigger mode:
1) On; the X2 is always on.
2) Audio; the X2 will automatically turn on when it detects an audio signal and turn off after 20 min-
utes with no signal.
3) 12V Ext; the X2 is remotely turned on when it detects a DC control signal from another com-
ponent in your system. The external trigger accepts 5 - 24 volt (DC) signals. For more information
regarding external triggers, consult your authorized dealer.
Master Gain (Front Panel)
The Master Gain control allows you to adjust the volume of the subwoofer relative to
the satellite speakers. Use the Master Gain judiciously. A properly calibrated sub-
woofer blends seamlessly with the satellites without calling attention to itself. Here are
some general guidelines for setting the Master Gain control:
Begin by playing some stereo music you are familiar with. Set your AV Receiver or Surround
Processor volume to a comfortable listening level. Slowly increase or decrease the Master Gain on the
X2 crossover, listening for a natural frequency balance between the subwoofer and the front left and
right satellites. When properly balanced, you will hear natural bass extension, without being aware that
it is coming directly from the subwoofer.
Once the Master Gain is set, the volume control on your AV Receiver or Surround Processor will con-
trol the volume of your entire system, including the subwoofer.
LFE Gain Control (Front Panel)
LFE is short for 'Low Frequency Effects'. Low Frequency Effects originally were low
frequency sounds added to movie soundtracks in order to increase their impact. For
consumer electronics, there is no standard concerning what type of signal might be
present on the LFE channel. Therefore, we have added an LFE input and gain control
to the X2 so that you can integrate whatever is present on the LFE channel with the
signal being reproduced by the rest of the system.
After you have set the Master Gain level as described above, play a multi-channel signal through your
system (as from a movie). Sources with lots of bass output will be the most useful. Adjust the LFE
gain control until the bass produced by the subwoofer reaches the desired level. Most users initially
set the level of the LFE gain control at too high a level, so be prepared to adjust the control over a long
period of time. You have reached an appropriate level setting when movies soundtracks have impact
and music sources have punchy bass, but the overall character of the bass produced by the subwoofer
is not thick and ill defined.
The level of the signal on the LFE channel varies considerably from source to source, so you may
need to adjust the LFE control on the X2 depending on the source material.
There is an LFE "Thru" output on the back of the X2. For more information concerning the use of this
output, visit our website, www.nhthifi.com/technicalhelp/evolution .