Controls/Front Panel - NHT B-20 Owner's Manual

1
+11
M
SENSITIVITY

CONTROLS/Front Panel:

1
Input Sensitivity Control:
This control affects both the subwoofer input and the high pass circuit. There are five settings: +11dB, +4dB, -3dB and -10dB and M ( Mute).
Typically +11dB and +4dB are used with higher output professional gear such as mixers, while the -3dB and -10dB positions match the levels used in
consumer products such as CD players and sound cards. Check the output specifications of the source equipment you are connecting to the B-20 Control
Amplifier and set accordingly.
2
Monitor High Pass (HP) Frequency Control:
This control sets the lowest frequency you wish to send to the main left and right monitors you're using with the B-20. There are 5 settings; BY (Bypass),
35Hz, 60Hz, 85Hz and 110Hz. Selecting the proper switch position (see the Initial Control Settings section on Pg. 6) will help blend the overall
system response and increase power handling. Engaging BY (bypass) turns off the high pass circuit, and sends fullrange sound to the monitors.
3
Boundary Control:
The Boundary selector switch is a control for the lowest frequencies, and is designed to compensate for the boost in bass that occurs when subwoofers are
placed near walls or in corners. The five switch indications refer to the number of walls adjacent to the woofer cabinet; '2' is for corner placement ; '0' for
open space; the control offers three additional settings in between for near corner and near wall placements . Setting the control to the '2' position will
produce the least boost: setting it to '0' will give the most.
4
Phase Control:
This five-position control provides phase compensation for such variables as room placement, listening position and the types of monitors you're using
with your B-20 system. Adjust the control in both directions until you find the position that produces the greatest bass level. This position assures the
best possible low frequency summing with the monitors you're using with the B-20.
5
Sub Low Pass Frequency Control:
This control adjusts the highest frequency the subwoofers reproduce, allowing you to match the precise point where your monitors' low end rolls off.
The low pass control is typically set to correspond with the Mon. High Pass but experimenting may produce better response in your system The BY
(Bypass) setting allows you to disengage the control if you use external bass management, or to match some surround protocols.
6
Subwoofer Gain Control:
The subwoofer level control matches the B-20 ouput level to the monitors' output level. This control differs from most as it doesn't turn the woofer all
the way off (use Bypass), but offers a 20dB range of adjustment. When set fully counter clockwise, this control attenuates the sub output by 20dB.
7
Bypass LED:
This amber LED is illuminated when the B-20 Control Amplifier is in the bypass mode, indicating that there is no subwoofer output, and a full-range
signal is going to the monitor (satellite outputs).
8
Power LED:
This green LED indicates the B-20 Control Amplifier is connected to AC mains and that the power switch is turned on. If the LED does not light up after
you've connected the B-20 system to the AC mains with the power switch in the on position, this indicates a blown fuse or trouble with the unit.
Disconnect the AC cord, and follow fuse replacement instructions carefully!
9
Master Power Switch:
Controls the on/off operation of the Control Amplifier.
10 Clipping LED:
This red LED indicates a clipping or overload condition. Occasional flashing of this indicator is a gentle warning you are reaching the system's limits. If
the LED glows continually, severe clipping is occurring. The input signal or system gain should be reduced to avoid the risk of possible
Stereo LED:
11
This blue LED is illuminated when the B-20 is operating in the stereo mode. Conversely, when operating in the mono mode, this LED will not be
illuminated.
2
3
60
+4 1
85
-3 35
BY 110 2
-10
SAT HI PASS BOUNDARY
4 5
95
0
-90 90 85 105
0
-180 180 70 BY
PHASE SUB LO PASS
Fig. 3 B-20 Front Panel
7 8 9
6
ON
BY PWR
ST CLIP
-20 0
OFF
SUB GAIN
B-20 CONTROL
AMPLIFIER
11
10
system damage.