Begin by playing some stereo music you are familiar with. Set your AV Receiver or Surround Processor volume to a com-
fortable listening level. Slowly increase or decrease the Master Gain on the X1 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 control 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 X1 so that you can integrate what-
ever is present on the LFE channel with the signal being reproduced by the rest of the system.
After you have adjusted the Master Gain control as described above, play a multi-channel recording 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 pro-
duced by the subwoofer reaches the desired level. Most users initially set the level of the LFE gain control too high, 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 sub-
woofer is not thick and ill defined.
The level of the signal on the LFE channel varies considerably from source to source, in most cases this can be adusted.
Consult the manual for your receiver or processor for further details.
There is an LFE “Thru” output on the back of the X1. For more information concerning the use of this output, visit our web-
site, www.nhthifi.com/technicalhelp/evolution .
High Pass Filter Switch (Rear Panel)
Note: If you are using Connection Method #2, the X1 High Pass Filter is not in the circuit path. Your
left and right speakers will reproduce the frequency range selected by your AV Receiver.
The High Pass Filter determines the range of frequencies that the left and right main speakers
("satellites") will reproduce. For example, a high pass setting of 80Hz means that the main speakers receive a signal con-
taining only frequencies above 80Hz. The 3-positon High Pass Filter is selectable between 50Hz, 80Hz, and 110Hz to
accommodate a variety of speaker sizes.
Set the High Pass Filter to a frequency above the rated low frequency limit of the main speakers. For example, if your
speakers have a rated low frequency response of 40Hz, use the 50Hz high-pass setting. If your speakers have a rated
low frequency response of 90Hz, use the 110Hz high-pass setting. Check the owner's manual for their rated low frequency
response.
Low Pass Filter Control (Front Panel)
The continuously variable Low Pass Filter determines the range of frequencies produced by the
subwoofer. For example, a low pass setting of 100Hz means that the subwoofer reproduces only
13
