Bogen NQ-PA120 User manual

Public Address Mixer/Amplifiers
Configuration Guide
NQ-PA120, NQ-PA240, NQ-PA600
© 2021 Bogen Communications, Inc.
All rights reserved.
740-00122A
211115

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Contents
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Configuring the Nyquist Public Address Mixer/Amplifiers . . . . . . . . . . . . . . . . . . . . 1
Using the Dashboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Standalone Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Updating Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Network Settings Tab Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Configuration Settings Tab Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Standalone Operation Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Accessing Log Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Setting DSP Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Setting the Channel Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Adjusting Volume Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Knob Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Signal Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Muting a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Selecting Input Type, Input Gain, and Phantom Power . . . . . . . . . . . . . . . . . . . . . . . .20
Troubleshooting Gain Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Compressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Ducker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Graphic EQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
High/Low Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Noise Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Parametric EQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Signal Present. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

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Configuring the Nyquist Public Address
Mixer/Amplifiers
Bogen’s Nyquist-based Public Address Mixer/Amplifiers (PAMAs) are Digital Signal Pro-
cessing (DSP)–based integrated mixer and power amplifiers designed for paging and
public address applications.
Available in 120-, 240-, and 600-watt models (NQ-PA120, NQ-PA240, and NQ-PA600),
the Public Address Amplifiers enable microphone-level and line-level source inputs to be
integrated into the Nyquist system.
A short press of the appliance’s Reset button reboots the device. If you press the Reset
button for 10 seconds, the appliance returns to the factory default configuration settings.
Returning to the default configuration settings does not change the appliance’s firmware.
The following sections describe settings and configurations that can be applied to this
device which are not controlled by the Nyquist server. For information about using
Nyquist’s automatic configuration process, refer to the appropriate Nyquist System
Administrator Guide.
To access the appliance’s user interface (UI):
1Access the appliance’s web UI by doing one of the following:
a) On your web browser, enter the IP address for the appliance as the URL.
b) From the Nyquist web UI navigation bar, select Stations, select Stations Status or
Appliance Status, navigate to the device that you want to configure, and then
select the Link icon.
2At the Nyquist Appliance Login page, enter username and password, and then select
Login.
The default username is admin; the default password is bogen.
The dashboard for the selected appliance appears.
Note: Do not use third-party Chrome browser extensions with the Nyquist user inter-
face.

2
See also:
•"Using the Dashboard” on page 2
•"Updating Firmware” on page 4
•"Network Settings Tab Parameters” on page 6
•"Configuration Settings Tab Parameters” on page 8
•"Accessing Log Files” on page 13
•"Setting DSP Parameters” on page 15
Using the Dashboard
The dashboard displays the following fields:
The following buttons are available at the top of all pages in the application.
Table 1. Appliance Dashboard Fields
Device Type Identifies the model of this device.
Serial Number Identifies the serial number for the device.
MAC Address Specifies the Media Access Control (MAC) address,
which is a unique identifier assigned to network inter-
faces for communications on the physical network seg-
ment.
Firmware Version Provides the firmware version installed on the device.
Standalone Operation Enables or disables Standalone mode.
Table 2. Appliance Dashboard Buttons
Dashboard Displays the dashboard.
Configuration Settings Accesses the Configuration Settings page where you can
view and set various options. If Standalone Operation is
not enabled, you can also receive configuration settings
from a Nyquist server.
Network Settings Accesses the Network Settings page where you can view
and set network settings, such as the static IP address.

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See also:
•"Configuring the Nyquist Public Address Mixer/Amplifiers” on page 1
•"Updating Firmware” on page 4
•"Network Settings Tab Parameters” on page 6
•"Configuration Settings Tab Parameters” on page 8
•"Accessing Log Files” on page 13
•"Setting DSP Parameters” on page 15
Standalone Operation
This device can run in Standalone Operation mode, where it will not interact with a
Nyquist server (e.g., E7000 or C4000). This means the device will not:
• Fetch device configuration from Nyquist server
• Register with Nyquist server (via SIP)
• Store backup information to Nyquist server
• Allow access to Nyquist server-based NTP
Standalone Operation mode is ideal for scenarios that do not require the full functionality
provided by an integrated system, such as the Bogen C4000 or E7000 Series, but has the
Firmware Update Accesses the Firmware Update page where you can view
the current Nyquist version, update firmware to a new
version, restore the configuration to factory defaults,
and reboot the appliance.
Logs Accesses log files, which record either events or mes-
sages that occur when software runs and are used when
troubleshooting the appliance.
DSP Accesses the DSP page where you can view and set
parameters for Digital Signal Processing (DSP).
Help Accesses the appliance’s online help.
Manual Displays the Nyquist Public Address Mixer/Amplifiers
Configuration Guide.
Logout Logs out of the appliance’s dashboard.
Table 2. Appliance Dashboard Buttons

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ability to provide paging, multi-channel audio processing, and a SIP endpoint for a PBX/
VoIP phone system. It can be used to play music, audio, paging, and related functions.
Updating Firmware
When you select Firmware Update from the appliance’s web UI, the Firmware Update
page appears. From this page you can determine which Nyquist firmware version the
appliance is using and if an update is available. You can also load a firmware release,
install the loaded firmware, restore the configuration to factory defaults, and reboot the
appliance.
To use the Firmware Update page:
1On the appliance web UI’s main page, select Firmware Update to view or update the
firmware version.
2If the device is in Standalone mode, selecting the Check for Updates button checks
the Bogen website for the latest firmware version available. If a version newer than
the one currently installed is found, it is downloaded to the appliance.
3If you already have a firmware file you would like to install to the appliance, select
Upload Firmware to upload the firmware file from your computer to the appliance. A
popup screen appears that allows you to select the file that you want to upload. You
can navigate to the file’s location. After you select the file, select Upload.
4The page displays the uploaded firmware version (“New Nyquist Version”) and an
Update Firmware button appears. Select this button if you want to update the appli-
ance’s firmware to the uploaded version.
5If you want to return your appliance to its original factory configuration, select
Restore Factory Settings.
6Select Reboot Appliance to restart your appliance.
Note: A Nyquist appliance connected to the Nyquist network receives a configuration
file from the Nyquist server that includes the latest firmware available from the server.
If the firmware is different from the one installed on the appliance, an automatic firm-
ware update occurs unless the Firmware parameter for the station is left blank. Refer to
the Nyquist System Administrator Guide for more information.

5
See also:
•"Configuring the Nyquist Public Address Mixer/Amplifiers” on page 1
•"Using the Dashboard” on page 2
•"Network Settings Tab Parameters” on page 6
•"Configuration Settings Tab Parameters” on page 8
•"Accessing Log Files” on page 13
•"Setting DSP Parameters” on page 15
Table 3. Firmware Update settings
Current Nyquist Version Shows the version of the appliance’s currently
installed firmware.
New Nyquist Version Shows the version of the firmware that has been
loaded, though not installed, onto the appliance.
Update Firmware Available only when a new firmware version has
been loaded onto the appliance (as specified in
New Nyquist Version).
Installs the loaded firmware. A reboot may be
required after installation.
Upload Firmware Prompts the user to specify a firmware file, which
will then be loaded (though not installed) onto the
appliance.
Note: To obtain the firmware file for a specific ver-
sion, please contact Bogen Customer Service.
Check for Updates Available only when the appliance is configured
for Standalone mode.
Checks the Bogen website for the latest firmware
version available and, if it finds a version newer
than what is currently installed, downloads it to
the appliance.
Restore Factory Settings Returns the appliance to its original factory con-
figuration.
Note: This does not install the original appliance
firmware. The firmware will not be changed.
Reboot Appliance Restarts the appliance.

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Network Settings Tab Parameters
Network settings can be configured dynamically by the Nyquist server or manually by
using the appliance’s web UI.
To manually configure network settings:
1On the appliance web UI’s main page, select Network Settings.
2Select your desired network settings.
3Select Save.
Network settings are described in the following table:
Table 4. Network Settings
IP Address Identifies the IP address assigned to the appliance.
Netmask Identifies the subnetwork subdivision of an IP net-
work.
Gateway Identifies the address, or route, for the default gate-
way.
VLAN ID Identifies the Virtual Local Area Network (VLAN) for
this appliance. Values range from 0 to 4094.
VLAN Priority Identifies the priority of the network traffic on the
VLAN. Priority can range from 0 through 7.
NTP Server Identifies the IP address or the domain name of the
Network Time Protocol (NTP) Server.
Note: This field is only editable when Standalone
Operation is enabled.

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TFTP Server Identifies the host name or IP address of the Trivial
File Transfer Protocol (TFTP) server.
The specified TFTP server can be used to automati-
cally set this device’s Configuration settings via the
Get Configuration from Server button.
If TFTP Server from DHCP (see below) is set to “Yes”,
this value will be auto-configured via DHCP option
66, assuming the DHCP server has been configured
to provide option 66. For details, see the documenta-
tion for your DHCP server.
Note: A TFTP server runs on the Nyquist server on
port 69 (the standard TFTP port) and the optional
Nyquist DHCP service automatically provides this
TFTP address via option 66.
Note: If this value is unspecified, the TFTP Server
from DHCP will automatically be set to “Yes”, this
field will become read-only, and DHCP will be used to
configure this setting. To change this value, the TFTP
Server from DHCP setting must be set to No, which
makes the field editable.
Note: This setting is not available when Standalone
Operation is enabled.
TFTP Server from DHCP “Yes” means the device will use the DHCP option 66
value to retrieve an address for the TFTP Server from
DHCP.
“No” means the device will ignore the DHCP option
66 value and use the manually configured value of
the TFTP Server (see above).
Note: This setting is not available when Standalone
Operation is enabled.
DHCP Enabled Indicates if the device is enabled to use DHCP to
retrieve its IP configuration.
Reboot Appliance Indicates that this appliance should reboot when the
Save button is clicked.
Table 4. Network Settings (Continued)

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See also:
•"Configuring the Nyquist Public Address Mixer/Amplifiers” on page 1
•"Updating Firmware” on page 4
•"Using the Dashboard” on page 2
•"Configuration Settings Tab Parameters” on page 8
•"Accessing Log Files” on page 13
•"Setting DSP Parameters” on page 15
Configuration Settings Tab Parameters
The easiest way to configure Nyquist appliances is to obtain configuration settings from
the Nyquist server by selecting Get Configuration From Server. However, you can man-
ually configure an appliance through the appliance’s Web UI when Standalone Operation
is enabled (see"Standalone Operation Configuration Settings” on page 9).
To view or modify the Nyquist appliance configuration:
1On the appliance Web UI’s main page, select Configuration Settings.
2View the settings as described in Table 5 on page 8 for normal configuration, or mod-
ify the settings as described in "Standalone Operation Configuration Settings” on
page 9 for Standalone Operation configuration.
3If changes were made (Standalone Operation only), click the Save Configuration
Settings and/or Save Multicast Addresses buttons to save your changes.
The following table describes the Configuration tab settings when Standalone Operation
is not enabled for this device:
Table 5. Configuration Settings (Standalone disabled)
Get Configuration from
Server
Retrieves configuration settings (i.e., web username,
server, and local port) from the TFTP server specified in
the Network Settings (see"Network Settings Tab
Parameters” on page 6).
Web Username Displays the username of the current user.
Emergency-All-Call Identifies the IP address, port number, cut level (vol-
ume), and station list used for emergency all-call
pages.

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The Configuration Settings tab also displays the following information for each Device
Station attached to the amplifier:
Standalone Operation Configuration Settings
The following table describes the Configuration Settings tab settings when Standalone
Operation is enabled for this device:
All-Call Identifies the IP address, port number, cut level (vol-
ume), and station list used for all-call pages.
Audio Distribution Identifies the IP address, port number, cut level (vol-
ume), and station list used for audio distribution.
Multicast # Identifies the IP address, port number, cut level (vol-
ume), and station list used for the multicast audio
stream of one (or more) zones.
Port Number Shows the output port/channel number of the appli-
ance.
Port Type Shows the device type to which the port connects.
Account ID Shows the SIP account (IP address) associated with the
device preceded by the extension of the device associ-
ated with this port.
Local Port Shows the port used for SIP.
Username Shows the username or extension for the station associ-
ated with the port.
Table 6. Configuration Settings (Standalone enabled)
Device Type Displays the type of this device.
Device Name Provide a name for this device.
Web Username Provide a web username for this appliance.
Web Password Provide a web password for logging into the appliance.
Web Confirm Password Re-enter the password used to log into the appliance.
Time Zone Select the time zone in which the device resides.
Table 5. Configuration Settings (Standalone disabled) (Continued)

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Prioritize Line Input If a channel simultaneously receives input signals from
both a network input and a line input, “Yes” means the line
input is used, “No” means the network input is used.
Yes or No
PTT Output Specify the output port to which the PTT microphone sig-
nal (from line input 4) will be sent.
Select one of the following values:
• Disabled
•Speaker
•Line Out
•Both
Speaker Load
Impedance
Specify the impedance load of the connected speaker(s),
Low (typically 4-16 ohms) or High (typically 1000+ ohms).
Speaker Output Power Controls the output power to the speaker. This can be a
value from -6 dB to +6 dB.
Enable SIP Calls Enables this device to receive one-way SIP calls, wherein
only the caller can be heard (such as announcements). If
enabled, a number of SIP-related configuration settings
are displayed.
Yes or No
SIP Server AddressaSpecify the IP address of the SIP Registration Server with
which the device will register.
SIP Network PortaSpecify the IP port on which to communicate with the SIP
Registration Server (typically 5060).
SIP CodecsaDisplays a read-only list of codecs allowed on SIP sessions.
SIP Extensiona
(Line Out/Speaker Out)
Specify the SIP extension corresponding to the Line Out or
Speaker Out channel.
The extension, along with the IP address, is used to specify
the URI used to place a SIP call to this extension:
sip:<extension>@<local_ip_address>
SIP Usernamea
(Line Out/Speaker Out)
Specify the SIP username used to register the Line Out or
Speaker Out channel with the SIP server.
Table 6. Configuration Settings (Standalone enabled)

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The following parameters appear for each Multicast Address configured for this device.
SIP Passworda
(Line Out/Speaker Out)
Specify the SIP registration password used to register the
Line Out or Speaker Out channel with the SIP server.
Cut Levela
(Line Out/Speaker Out)
Specify the intercom volume to be used for SIP calls over
Line Out or Speaker Out.
This can be a value from -42 and 0 dB.
The default value is -20 dB.
Note: To modify, click on the value, adjust the slider on the
popup using the cursor keys or mouse, and click the check
box button.
a. Available only when Enable SIP Calls has a value of Yes.
Multicast IP Address The multicast IP address on which to receive audio
streams.
Multicast Port Number The multicast port on which to receive audio streams.
Table 6. Configuration Settings (Standalone enabled)

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Codec The codec to be used when decoding audio. Select one of
the following values:
• G711 u-law
• Intercom quality
•A narrowband audio codec that provides toll-qual-
ity audio at 64 kbps. The u-law version is primarily
used in North America and Japan.
• G711 a-law
•Intercom quality
•A narrowband audio codec that provides toll-qual-
ity audio at 64 kbps. The a-law version is primarily
used in most countries outside of North America
and Japan.
• G722
•Tone and paging quality
•A wideband audio codec operating at 48, 56, and
64 kbps.
• OPUS
•Music quality
•An audio codec format designed for speech and
general audio, supporting low latency, constant and
variable bitrate encoding (6 to 510 kbps), and five
sampling rates (from 8 to 48 kHz).
Channels Specifies to which channel(s) the multicast audio will be
output. Select one or both of the following values:
• Line out
• Speaker out
Cut Level (dB) Adjusts the cut level for the audio stream.
This can be a value from -70 to 0 dB.
The default value is -20 dB.
Note: To modify, click on the value, adjust the slider on the
popup using the cursor keys or mouse, and click the check
box button.
Tip: To fine tune the cut level per channel, adjust the gain settings on
the DSP Router.

13
See also:
•"Configuring the Nyquist Public Address Mixer/Amplifiers” on page 1
•"Updating Firmware” on page 4
•"Network Settings Tab Parameters” on page 6
•"Using the Dashboard” on page 2
•"Accessing Log Files” on page 13
•"Setting DSP Parameters” on page 15
Accessing Log Files
A log file records events and messages that occur when software runs, to be used when
troubleshooting the appliance. From the appliance’s web-based UI, log files can be
viewed directly or exported via download to your PC, Mac, or Android device, where they
can be copied to removable media or attached to an email for technical support.
To view a log file:
1On the appliance Web UI’s main page, select Logs.
2From the drop-down menu, select the log that you want to view.
Multiple versions of the same log, and zipped copies of the log, may be available.
3To export the file, select Export.
A link to a .txt file appears in the browser’s lower left corner.
Available logs are described in the following table. If a log file is empty, however, it will
not appear in the drop-down list of available logs.
Note: Multicast Addresses should be ordered by priority, highest priority first. If multi-
ple streams are active simultaneously, the one with the highest priority will be played.
Note: A maximum of 24 multicast entries is supported.

14
Table 7. Logs
Log Description
ampws.log Contains information about protection status and logs
protection events with temperature information at the
time of event.
auth.log Contains system authorization information, including
user logins and authentication methods that were
used.
btmp Contains information about failed login attempts.
daemon.log Contains information logged by the various back-
ground daemons that run on the system.
debug Contains errors and debug information.
dpkg.log Contains information that is logged when a package is
installed or removed using dpkg command.
faillog Contains user failed login attempts.
kern.log Contains information logged by the kernel and recent
login information for all users.
lastlog Contains information on the last login of each user.
messages Contains messages generated by Nyquist.
php5-fpm.log Contains errors generated by the PHP script.
syslog Contains list of errors that occur when the server is run-
ning and server start and stop records
user.log Contains information about all user level logs.
wtmp Contains historical record of users logins at which ter-
minals, logouts, system events, and current status of
the system, and system boot time.

15
See also:
•"Configuring the Nyquist Public Address Mixer/Amplifiers” on page 1
•"Using the Dashboard” on page 2
•"Updating Firmware” on page 4
•"Network Settings Tab Parameters” on page 6
•"Configuration Settings Tab Parameters” on page 8
•"Setting DSP Parameters” on page 15
Setting DSP Parameters
When you select DSP (Digital Signal Processing) from the appliance’s web UI, the DSP
page appears. This page presents a mixing board interface, allowing you to monitor, con-
trol, and perform DSP operations on the signals of the input and output channels.
Note: Digital Signal Processing (DSP) refers to the digital operations that are performed to
modify or control the digital signal.
The signal for a channel can come from either of two sources:
1An analog line input signal
2A digital VoIP audio stream or multicast audio
The level of an analog line input signal can be adjusted via the mixer’s Input Gain control.
The analog signal is then converted to a digital signal, after which its level is then con-
trolled using the slider control.
Digital VoIP audio streams received over the network, either as SIP-initiated phone calls
or as multicast audio (see SIP and Multicast configuration settings in"Configuration Set-
tings Tab Parameters” on page 8), are controlled by the mixer’s Network input channels:
Input 5 and Input 6. The Input 5 channel maps to Line Out, while Input 6 maps to Speaker
Out.
Each digital signal, regardless of the source, is conditioned, filtered, and enhanced via the
DSP processors, and its level adjusted via the mixing board’s slider controls. The pro-
Note: The network channels, Input 5 and 6, control the levels and DSP processing for
the received network audio streams, while Output 1 and Output 2 control the output
levels and final DSP processing of the output signal. Keep in mind that the output
channels may include other signals that have been sent via the DSP Router to those
output channels, such as the signals from Inputs 1 through 4 (though network audio
streams take precedence over the analog signals from Inputs 1 through 4).

16
cessed signal from each channel is then routed to the Line Out and/or Speaker Out chan-
nel according to the DSP Router configuration (see"Router” on page 31).
The digital output of all channels that are routed to the Line Out and Speaker Out are dig-
itally merged, processed according to the output channel’s DSP settings, and ultimately
converted to an analog signal and sent to the output connectors. Signals that are routed
to the Network output channels via the DSP Router can be distributed as digital audio on
the network using a Nyquist server’s Audio Distribution feature.
Note: Audio Distribution functionality requires a Nyquist server and is not supported in
Standalone Operation mode.
The DSP page displays a mixing board console containing six input strips and two output
strips. Each strip controls the audio signal for a given channel, providing muting, input/
output levels, signal processing, and more. Signal processing includes traditional audio
processing, such as compressors, noise gates, equalizers, and more. There are some dif-
ferences between the controls available for different channel types (e.g., output channels
do not have input gain controls), but they otherwise operate very similarly.
This console can be used to do the following:
• View Signal and Clip indicators for each channel.
• Set the channel levels for the input and output channels:
• The Input 1, 2, 3, and 4 sliders control the output levels at which the digitized sig-
nal from the four analog input channels will be sent to the network devices, Line
Out, and Speaker Out channels (subject to Router settings).
• The Input 5 and 6 sliders control the output levels at which the signals from the
two network input channels will be sent to the Line Out and Speaker Out channels.
• The Line Out and Speaker Out sliders control the overall level of the Line Out and
Speaker Out channels.
• Apply DSP features to the signal of each input and output channel individually.
• Specify whether each analog input channel uses Line or Mic input. (See "Selecting
Input Type, Input Gain, and Phantom Power” on page 20.)
• Adjust the Input Gain level for each analog input channel. (See"Selecting Input Type,
Input Gain, and Phantom Power” on page 20.)
• Control Phantom Power for any channel using Mic as the input. (See"Selecting Input
Type, Input Gain, and Phantom Power” on page 20.)
Selecting the DSP Features menu at the top-right corner of a channel displays a menu of
DSP features for that channel. Each channel, both input and output, has its own associ-
ated menu, and the corresponding DSP features will be applied to the signal for that par-
ticular channel.

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The various mixer controls, as well as the DSP features available via the DSP Features
menu, are briefly described in the following table and will be discussed in more detail in
subsequent sections.
The DSP features that can be applied to a channel, accessible through the DSP Features
menu, are described in the following table.
Note: The DSP page (including the mixing board and other DSP pages) can only be
used by one browser session at a time. If another session is already connected and
using this DSP page, the mixing board displayed will be disabled.
Table 8. DSP Page
Save Settings to Server Backs up the DSP settings to the server. If this device is
later replaced or reset to factory defaults, these DSP set-
tings can be restored when the new device is “swapped”
for the old on the Nyquist server.
Note: This button appears on each DSP feature page.
Mute Silences the audio for the selected channel.
DSP Features button Presents a menu of DSP features that can be applied to the
corresponding channel.
Level Slider Adjusts the channel volume level in 1 dB increments.
Signal LED Illuminates when a signal is being received.
Clip LED Illuminates when a signal has exceeded the maximum
threshold, indicating that the signal is “clipping.”
IN VU meter Indicates the strength of the input signal.
OUT VU meter Indicates the strength of the output signal.
Input Gain Adjusts the strength of the input signal.
Line/Mic Determines whether the input signal coming from the
channel’s input jack is at line or microphone level.
Phantom Power Determines if phantom power is being provided to the
input microphone.

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You can set Limiter parameters for the output signal or set global Ducker and Router
settings by selecting the option you want from the drop-down menu available for the
output.
Table 9, DSP Features
Compressor Lessens the dynamic range between the loudest and qui-
etest parts of an audio signal.
Ducker Lowers, or ducks, the output of a channel when another
signal is encountered.
Graphic EQ Uses fixed frequencies to tailor the frequency content of
an audio signal.
High/Low Pass Filters out frequencies in the input signal that are above
and below specified high and low cutoff frequencies.
Limiter Prevents a signal from exceeding a certain pre-set maxi-
mum level.
Noise Gate Eliminates low-level hiss, noise, or leakage, particularly
when there is a high level of ambient noise.
Parametric EQ Uses a center/primary frequency to all tailoring of the fre-
quency content of an audio signal.
Router Routes the audio signals from each input channel to zero
or more output channels, as well as adjusting the level of
each input signal per selected output channel.
Settings Allows you to provide names and colors for the input and
output channels.
Signal Present Allows you to configure the threshold level and duration
that a signal must reach before the Signal LED will be acti-
vated for this channel.
Status Provides real-time status of the selected channel.
Reset button Present on almost all DSP screens other than the main
mixer, this button will reset the DSP settings to the dis-
played feature’s default setting.