Public_Address_Amplifiers_Config-7
Author: Bogen

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, control, 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:

1​An analog line input signal

2​A 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 controlled using the channel fader 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 Settings Tab Parameters"), 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.

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).

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 channel fader controls. The processed signal from each channel is then routed to the Line Out and/or Speaker Out channel according to the DSP Router configuration (see "Router").

The digital output of all channels that are routed to the Line Out and Speaker Out are digitally 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.

Figure 9. DSP Page

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 differences 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 channel faders control the output levels at which the digitized signal 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 channel faders 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 channel faders 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".)

Adjust the Input Gain knob level for each analog input channel. (See "Selecting Input Type, Input Gain, and Phantom Power".)

Control Phantom Power for any channel using Mic as the input. (See "Selecting Input Type, Input Gain, and Phantom Power".)

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 associated menu, and the corresponding DSP features will be applied to the signal for that particular channel.

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.

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 11. 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 settings 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.
Channel Fader | 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.” Note: When Sound Masking is enabled, Clip LED is illuminated.
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.

The DSP features that can be applied to a channel, accessible through the DSP Features menu, are described in the following table.

Table 12, DSP Features

Compressor | Lessens the dynamic range between the loudest and quietest 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 maximum 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 frequency 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 activated 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 displayed feature’s default setting.

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.

Figure 10. DSP Output Options

See also:

"Selecting Input Type, Input Gain, and Phantom Power"

"Muting a Channel"

"Adjusting Volume Levels"

Setting the Channel Level

The channel level control is a channel fader, which is adjusted in 1-dB increments and controls the output level for the channel. The channel levels can range from −60 to +12 dB. If you place the mouse over the fader, the numerical value of the level appears.

Adjusting Volume Levels

The channel fader control can be used to adjust the channel’s output level in 1-dB increments between −60 and +12 dB. The overall adjusted output level of the channel signal can be viewed on the OUT VU meter, marked in 2-dB increments between −60 and 0 dB.

Tip:​For best results, adjust input signal levels until you have a strong signal (i.e., within the green and yellow areas on the meter), then adjust the final output levels using the DSP Outputs controls.

To adjust the channel volume level:

1​On the appliance Web UI’s main page, select DSP.

2​Use the channel’s fader to adjust the volume level.

Knob Adjustments

Many DSP controls use knobs to adjust one or more settings. The value of a knob can be adjusted in one of two ways:

1​Click the knob control, hold the mouse button down, and drag the mouse up or down to increase or decrease the value.

2​Double-click the knob, type a value into the resulting popup, and click the Save button.

Signal Indicators

Each input channel has signal indicators and two vertical volume unit (VU) meters, labeled “IN” and “OUT”.

The green input signal LED(s) automatically illuminates when a signal is being received.

The red Clip LED automatically illuminates when the signal is clipping (i.e., exceeding a predefined threshold). Clipping can result in distortion and, for output signals, can even damage speakers. Note that the specific level and duration that a signal must reach in order to trigger the input signal LED can be configured via the Signal Present settings.

The “IN” VU meter indicates the strength of the channel’s input signal (after gain adjustments), while the “OUT” VU meter indicates the strength of the channel’s output signal. The VU meter not only illuminates green, yellow, or red (depending on the signal level), but also has a scale ranging from −60 to 0 dB to indicate the actual signal level.

Muting a Channel

You can mute a channel to cut off an audio signal and stop the input signal from being sent to the output channel. Note the input signal will still be visible on the IN meter, but the OUT meter will show that nothing is being forwarded to the output channel.

To mute a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Click the Mute button for the channel that you want to silence.
The Mute button will illuminate red. You can click the Mute button again to unmute the channel.

Selecting Input Type, Input Gain, and Phantom Power

Just above the labels for the input channels is a switch that allows you to select either Line or Mic as the input, indicating the type of input signal being used. A line level signal is typically at least 50 dB greater than a mic level signal.

If you select Mic as the input, you can specify whether or not the microphone will use phantom power. Phantom power is electrical power that is sent to a condenser mic through its mic cable.

Note: Phantom power is only used by devices that contain active electronics, such as condenser microphones and many direct boxes. It uses a balanced signal, which renders it effectively invisible to balanced microphones that do not use it. When enabled, +15V of balanced phantom power is available on pins 2 and 3 of the XLR connector or the +/− terminals of the Phoenix connector.

Caution​Phantom powering can cause equipment malfunction, or even damage, if used with cables or adapters that connect one side of the input to ground, or if certain equipment other than microphones is connected to it.

Because input signal levels can vary greatly based on the attached device, you will want to adjust the Input Gain for a channel to ensure the input signal level is high enough to use, but not so high that it sounds distorted. The input signal level can be viewed on the “IN” VU meter and adjusted using the Input Gain knob.

Tip:​Typically, a good input signal will vary between the high green and low yellow areas of the VU meter, but your ears should be the ultimate judge of a good signal. Remember, the purpose of the Input Gain is to adjust the strength of the input signal, not the volume of the final output signal.

See also:

"Muting a Channel"

"Adjusting Volume Levels"

Troubleshooting Gain Structure

Channel faders should be set to 0 dB (unity gain) during the channel-level setup procedure.

The optimal operational range of the Input Gain control knob is from about 9 o’clock to 2 o'clock.

If Channel Clipping Occurs

If the signal is clipping or producing audible distortion, the gain is too high. Reduce the Input Gain knob by turning the knob counterclockwise until the clipping and distortion have been eliminated. If the signal cannot be reduced below clipping with the Input level control at minimum and the input source is not a microphone, change the Input setting to Line to pad the signal to a lower level.

Also, make sure that the Input Gain is set within the optimal range between the 0 and −20 dB positions on the gain control knob.

If Channel Volume Is Too Low

If the channel fader volume control must be set above the +6 dB position to provide adequate volume, the Input Gain setting is too low. Set the channel level fader to 0, turn the Input Gain knob to the 1 o'clock position, and increase the Input Gain by turning the knob clockwise until clipping occurs or the VU meter’s signal level is between −10 dB and −3 dB. Then, adjust the Input Gain to a setting just below the clipping level.

If the signal cannot be increased with the Input Gain knob at 2 o’clock to 3 o'clock, make sure the input is not set to Line.

Note: Some microphones produce very low output. It may not be possible to completely compensate for the low level, but it should be possible to provide a usable output signal. A quality dynamic microphone output level is approximately −55 dB. Check your microphone’s specifications.

If Channel Volume Is Too High

If a channel is not clipping but the channel fader level control must be set below the −20 dB position to achieve the proper volume level, the Input Gain control setting is too high. Set the channel fader to the 0 dB position and adjust the Input Gain control knob until the desired volume level is achieved. Reduce the Input Gain by turning the knob counterclockwise.

If the signal cannot be reduced below clipping with the Input level control at minimum (and the input source is not a microphone), change the Input to Line to pad the signal to a lower level, set the channel fader control knob to the 0 dB position and adjust the Input Gain control until the desired volume level is achieved.

Compressor

A compressor reduces the dynamic range of a signal. This effect is perceived as quieting loud sounds and boosting quiet sounds.

Figure 11. Compressor Settings

To adjust the compressor settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Compressor.

4​Make desired adjustments using the controls described in Table 13, “Compressor Settings,” on page 27.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

5​Select Enable to apply the settings to the selected channel.

Table 13. Compressor Settings

Enable | Enables or disables the compressor DSP effect for this channel.
Threshold | Sets the threshold level, which is the point where the signal activates the compressor circuit. The range is −135 to +21 dB.
Attack | Sets how quickly or slowly compression will be applied to the signal once the audio signal goes above the threshold level. It specifies the length of time over which the compression ratio will gradually increase from no compression to full compression. The range is 1 to 500 ms.
Hold | Sets how long compression will be applied after the signal has fallen below the threshold. The range is 1 to 500 ms.
Decay | Sets how quickly or slowly compression will be removed from the signal after the signal has dropped below the threshold and the Hold interval has expired. It specifies the length of time over which the compression ratio will gradually decrease from full compression to no compression. The range is 0 to 2000 ms.
Knee | Sets how far below the threshold compression will begin to be gradually applied to the signal. A very low value, known as a hard knee, immediately applies full compression once the threshold is reached. A high value, known as a soft knee, will gradually start applying compression before the signal reaches the threshold, not reaching the full effect until the threshold is reached, thereby “rounding off” the compression effect. Increasing the knee level decreases the obvious transition from the uncompressed to the compressed sound. The range is 1 to 100 dB.
Ratio | Sets the compression ratio to be applied to the signal. For example, if the ratio is set for 6 (6:1), the input signal must increase by 6 dB for the output level to increase by 1 dB. The range is 1 to 100.
Input meter | Shows the strength of the input signal.
Output meter | Shows the strength of the output signal, providing a visual indicator of the effect of the compressor on the output signal.
Comp LED | Illuminates when compression is being applied to the signal.

Ducker

Ducking is an audio effect in which the level of one audio signal is reduced by the presence of another signal. For example, if background music is playing when a page is made, the ducker will sense the presence of audio from a paging microphone and trigger a reduction in the output of the music signal for the duration of the page. The ducker restores the original level for the background music once the page is over.

Figure 12. Ducker Parameters

To adjust the ducker settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel or select the Menu button for the Output.

3​From the drop-down menu, select Ducker.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Make desired adjustments using the controls described in the following table:

Table 14. Ducker Parameters

Threshold | Sets the threshold level, or how loud the signal has to be, before ducking is enabled. The range is -135 to +20 dB.
Hold | Sets how long the master continues to duck the signal after the signal is below the threshold. The range is 1 to 500ms.
Master | Select the channel that serves as the master, or unducked, channel. The audio on this channel has priority; audio for all other channels is ducked.
Ducked | Select the channel or channels that will be ducked when the threshold is reached on the master channel.

Graphic EQ

The graphic equalizer allows you to tailor the audio signal to optimize the frequency response of the sound system.

The graphic equalizer parameters are set per channel.

Figure 13. Graphic EQ Settings

To adjust the graphic equalizer settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Graphic EQ.
The Graphic EQ provides 16 slider knobs that can be moved between +12 dB and −12 dB. The frequency of each slider is different and range from 25 Hz to 20,000 (20k) Hz. By default, each knob is set at 0 dB, which means that no frequencies are being boosted or cut.

Note: For the best results, frequencies should be cut only. Boosting frequencies to compensate for room dimensions or speaker response deficiencies usually results in a loss of headroom in the signal chain.

4​Adjust frequencies as desired, ensuring the Enable LEDs are green for the selected frequencies.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

High/Low Pass

High-pass filters allow signals that are higher than the specified frequency and attenuate signals that are lower. Low-pass filters allow signals that are lower than the specified frequency and attenuate signals that are higher. When combined, they are known as a band-pass filter. Band-pass filters can be used to tailor the frequency response of a microphone exclusively for vocals, which can be very useful in a noisy environment to filter out the higher and lower frequencies that could mask the human vocal range during announcements.

You can specify the range of frequencies that will pass through the high-pass and low-pass filters and select the type of filter that is used through the channel’s High/Low Pass drop-down menu option.

Figure 14. High/Low Pass Parameters

To adjust the high/low pass parameters for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select High/Low Pass.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Set the parameters described in the following table:

Table 15. High/Low Pass Parameters

High-Pass (Low Cut) This feature helps eliminate low-frequency noise (signals of 100 Hz and below, such as background rumble from ventilation systems, etc.) and is used primarily with microphone-level input. It is particularly effective when handheld microphones are used.
Enable | Enables or disables the High-Pass filter.
Frequency | Set the cutoff frequency. You can adjust the frequency by moving the knob (click and move up or down) or by double-clicking the knob and typing the frequency. When typing the frequency, only numeric values from 20 Hz to 20,000 Hz can be entered. The high-pass filter attenuates content below this frequency and lets frequencies above this cutoff frequency pass through the filter.
Type | Available filter types are: Linkwitz-Riley (12, 24, 36, and 48 dB per octave) Butterworth (6, 12, 18, 24, 30, 36, 42, and 48 dB per octave) Bessel (12, 18, and 24 dB per octave) Note: The term “dB per octave” describes how steeply frequencies below the selected cutoff frequency are attenuated. For example, if the cutoff frequency is 100 Hz and the filter type specifies 12 dB per octave, a 50-Hz signal (i.e., one octave lower) will be attenuated by 12 dB and a 25-Hz signal (i.e., two octaves lower) will be attenuated by an additional 12 dB.
Low-Pass (High Cut) This feature helps eliminate high-frequency noise (signals of 8000 Hz and above) such as background hiss and sibilance (excessive "S" in vocals, etc.) and is used primarily with microphone-level input. It is particularly effective when handheld microphones are used.
Enable | Enables or disables the Low-Pass filter.
Frequency | Set the cutoff frequency. You can adjust the frequencies by moving the knob (click and move up or down) or by double-clicking the knob and typing the frequency. When typing the frequency, only numeric values from 20 Hz to 20,000 Hz can be entered. The low-pass filter attenuates content above this frequency and lets frequencies below this cutoff frequency pass through the filter.
Type | Available filter types are: Linkwitz-Riley (12, 24, 36, and 48 dB per octave) Butterworth (6, 12, 18, 24, 30, 36, 42, and 48 dB per octave) Bessel (12, 18, and 24 dB per octave) Note: The term “dB per octave” describes how steeply frequencies above the selected cutoff frequency are attenuated. For example, if the cutoff frequency is 8,000 Hz and the filter type specifies 12 dB per octave, a 16,000-Hz signal (i.e., one octave higher) will be attenuated by 12 dB and a 32,000-Hz signal (i.e., two octaves higher) will be attenuated by an additional 12 dB.

Limiter

A limiter is a compressor with a high slope (i.e., attack) that is used to prevent a signal from exceeding a set decibel level. Limiters are used as safeguards against signal clipping.

Limiter parameters are set per channel.

Figure 15. Limiter Settings

To adjust the limiter settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel or select the Menu button for the Output.

3​From the drop-down menu, select Limiter.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Adjust the following settings as needed:

Table 16. Limiter Settings

Threshold | Sets the signal level at which the limiter is triggered. Any signal exceeding this threshold will be compressed to this level. The range is −24 to +24 dB.
Decay | Sets the rate for turn off of the limiter after the signal is below the threshold. Decay range is 5 to 2300 milliseconds.
RMSTC (Root Mean Square Time Constant) | Sets how fast the limiter reacts to a signal that has exceeded the threshold. RMSTC range is 50 to 10000 dB/sec.

Noise Gate

A noise gate controls the volume of an audio signal by attenuating the signal when it registers below the threshold. This is typically used to eliminate or minimize background noise.

Figure 16. Noise Gate Settings

To adjust the noise gate settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Noise Gate.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Adjust the following settings as needed:

Table 17. Noise Gate Settings

Enable | Enables or disables the noise gate DSP effect for this channel.
Threshold | Sets the minimum threshold level that the signal must reach for the noise gate to “open,” allowing the signal to be sent to the output channel. Threshold range is −135 to +21 dB.
Attack | Sets how long it takes for the gate to open once the signal reaches the threshold level. Attack range is 1 to 500 ms.
Hold | Sets the length of time the gate will stay fully open after the signal reaches the threshold level. Hold range is 1 to 500 ms.
Decay | Sets hows quickly or slowly the gate will close once the signal has dropped below the threshold level and the Hold interval has expired. Decay range is 0 to 2000 ms.

Parametric EQ

A parametric equalizer is a multi-band variable equalizer that allows control of frequency amplitude (boost/cut), center frequency, and frequency bandwidth, or Q.

Figure 17. Parametric Equalizer Settings

The parametric equalizer settings for your device allows you to adjust the Q and gain for seven separate frequencies, which then become plot points on the screen’s graph.

To adjust the parametric equalizer settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Parametric EQ.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Adjust frequencies as desired, ensuring the Enable LEDs are green for each selected frequency. You can adjust the frequencies by moving the Freq knob or by double-clicking the knob and typing the frequency. When typing the frequency, only numeric values from 20 to 20,000 can be entered.

5​Make desired Q adjustments by adjusting knob (or double-clicking and typing the desired adjustment). Q can be from 0.1 to 20 and sets how wide to either side of the selected frequency the adjacent frequencies are affected.

Q is the Quality or Quality Factor, which refers to the bandwidth of one band of a parametric equalizer. Q is calculated by dividing the center frequency in Hz by the width of the boost or cut zone, +3 dB or −3 dB above or below 0 dB.

6​For each frequency, use the Gain knob or double-click the knob and type the gain to either boost (turn up) or cut (turn down).

Gain knobs can be moved between +12 or −12 dB. By default, each knob is set at 0 dB, which means that no frequencies are being boosted or cut.

7​Select Save Settings to Server.

Router

The Router allows you to specify which analog input signal(s) will be sent to which output channel(s). In addition, you can adjust the level of each individual input signal on each output channel to which it is routed. You can access the Router page from the drop-down menus of each channel, but only one router exists for the appliance.

In essence, you need to enable the input signals that you want to use (green areas), enable the output channels that you want to use (blue areas), and enable the mapping (gray areas) to indicate which inputs will be mixed into which outputs. You can also use the volume knobs to customize the overall volume of an input signal (green areas), the overall volume for an output channel (blue areas), and the volume of a specific input signal on a given output channel (gray areas).

The input channels and output levels for all network signals can only be controlled via the Router. For each analog input signal to be sent over the network, activate the Enable button and adjust the relative level knobs (“A#→N#”) for one or more Network channels. Finally, adjust the overall output level knob (“Network #”) of the final network signal.

Figure 18. Router Settings

To adjust the router settings:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel or select the Menu button for the Output.

3​From the drop-down menu, select Router.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Adjust the input, output, and cross gain settings as desired.

5​To route a signal to a specific output, select the Input's Enable button so that it changes from gray to green.
This signal can be sent to Network 1, 2, 3, or 4, to the Line Out, to the Speaker Out, or to any combination of these.
Network outputs are signals that can be used as an audio stream source, to be sent by a Nyquist server to other stations or appliances.
The Line Out and Speaker Out outputs are sent to the corresponding balanced connectors on the rear panel of the appliance.
Signals from input channels Analog 1 to 4 can be mixed to each output as desired. Multiple input signals can be mixed to multiple outputs or to a single output. Likewise, outputs are enabled by selecting the Enable button for the selected outputs (turning the button from gray to green).

Settings

You can specify custom names and colors for each of the input and output channels. This allows you to customize the appearance of the mixer board.

Figure 19. Settings Parameters

To adjust the settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Settings.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​For each channel, type the name that you want to display for the channel.

5​For each channel, select a color that will be used to highlight the channel.

6​Select Save.

Signal Present

You can configure the threshold level that a signal must reach before the signal LED is lit, as well as how long the LED will remain lit. You can configure this for each channel.

Figure 20. Signal Present Parameters

To adjust the Signal Present settings for a channel:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Signal Present.

Note: If you want to return to the factory settings, select the Reset icon that appears in the right corner.

4​Adjust the following settings as needed.

Table 18. Signal Present Parameters

Threshold | Sets the minimum level the signal must reach before the signal LED is illuminated. Threshold range is −144 to +24 dB.
Hold | Sets the minimum number of milliseconds that the signal LED will remain illuminated. Hold range is 2 to 200 milliseconds.

Status

The Status selection for the power amplifier provides LEDs for thermal protection and clipping and a real-time reading of the appliance’s temperature.

Figure 21. Status

To view status for the power amplifier:

1​On the appliance Web UI’s main page, select DSP.

2​Select the Menu button for the channel.

3​From the drop-down menu, select Status.
The view only information that appears is described in the following table:

Table 19. Status

Thermal Protect | Appears red if the output channel is being overloaded or there is an external short and the amplifier has placed itself into protection mode to prevent permanent damage. Otherwise, the LED is green.
Output Limit | Appears red if the output signal is being clipped or distorted. Otherwise, the LED is green.
Temperature | Provides the real-time temperature of the appliance in both Celsius and Fahrenheit. The amplifier enters protection mode if the temperature exceeds 85 °C.