NHT Evolution System - Manual (Page 39)

High Pass Filter Switch (Rear
Panel) - Connection Method 2
and 3 Only
Note: If you are using Connection Method #1,
the X1 High Pass Filter is not in the circuit path.
Your monitors will reproduce the frequency
range selected by your AV Receiver.
The High Pass Filter determines the range of
frequencies that the main speakers ("satellites")
will reproduce. For example, a high pass setting
of 80Hz means that the main speakers receive
a signal containing only frequencies above
80Hz. The 3-positon High Pass Filter is selec-
table between 50Hz, 80Hz, and 110Hz to
accommodate a variety of speaker sizes.
If you are using Evolution monitors, the setting
for this control shown is Section 7 should be suf-
ficient. If using speakers other than Evolution
monitors and Connection Methods 2 or 3, use
the guidelines below.
Set the High Pass Filter to a frequency above
the rated low frequency limit of the main speak-
ers. 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) -
Connection Methods 2 and 3 Only
The continuously variable Low
Pass Filter determines the range of
frequencies produced by the sub-
woofer. For example, a low pass
setting of 100Hz means that the
subwoofer reproduces only frequencies below
100Hz. The LFE input is not affected by this
control.
Adjust the Low Pass Filter to approximately the
same setting as the High Pass Filter as a start-
ing point. Adjust the Low Pass Filter in small
increments up or down until the blend between
the Evolution Subwoofer and your main speak-
ers is seamless and the subwoofer does not call
attention to itself. Music featuring male vocals,
cello and acoustic bass, bass guitar and certain
wind instruments (like saxophone and trom-
bone) is useful for setting the low pass frequen-
cy.
Phase Controls (Front Panel)
The Subwoofer Phase switch
and continuously variable knob
set the phase of the subwoofer
output anywhere from 0° to
270° relative to the high pass
output. Proper subwoofer phase is important in
achieving smooth bass response. An improper
phase setting can cause large peaks and dips in
the frequency response of the combined sub-
woofer/satellite system at the listening position.
The result of the peaks and dips is low frequen-
cy production that is very pronounced at certain
frequencies and a lack of seamless integration
between the satellites and subwoofer.
The optimal phase setting will differ according to
room conditions and placement. While fine tun-
ing phase settings, have a familiar stereo CD
available. You should listen to the same song
while alternating phase settings. Find the best
setting while sitting at the primary listening posi-
tion.
The initial settings described in Section 7 should
be an adequate starting place for your Evolution