Shure IntelliMix P300 Safety Information Manual
Safety Information
IMPORTANT SAFETY INSTRUCTIONS
1. READ these instructions.
2. KEEP these instructions.
3. HEED all warnings.
4. FOLLOW all instructions.
5. DO NOT use this apparatus near water.
6. CLEAN ONLY with dry cloth.
7. DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accor
dance with the manufacturer’s instructions.
8. DO NOT install near any heat sources such as open flames, radiators, heat registers, stoves, or other appara
tus (including amplifiers) that produce heat. Do not place any open flame sources on the product.
9. DO NOT defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wider
blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.
10. PROTECT the power cord from being walked on or pinched, particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
11. ONLY USE attachments/accessories specified by the manufacturer.
12. USE only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.
When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. UNPLUG this apparatus during lightning storms or when unused for long periods of time.
14. REFER all servicing to qualified service personnel. Servicing is required when the apparatus has been dam
aged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.
15. DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled with liquids, such as vas
es, on the apparatus.
16. The MAINS plug or an appliance coupler shall remain readily operable.
17. The airborne noise of the Apparatus does not exceed 70dB (A).
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18. Apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing
connection.
19. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
20. Do not attempt to modify this product. Doing so could result in personal injury and/or product failure.
21. Operate this product within its specified operating temperature range.
Note: Model information and power ratings are labeled on the bottom of the unit.
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within
this unit.
This symbol indicates that there are important operating and maintenance instructions in the litera
ture accompanying this unit.
Overview
General Description
The P300 IntelliMix® Audio Conferencing Processor offers IntelliMix DSP algorithms optimized for audio / video
conferencing applications, featuring 8 channels of acoustic echo cancellation, noise reduction and automatic gain
control to ensure a high-quality audio experience.
The P300 provides Dante (10 in / 2 out), Analog (2 block in / 2 block out), USB (1 in / out) and Mobile (3.5 mm)
connectivity options that makes connecting to room systems and collaborating with laptops and mobile devices
easier than ever
Features
• Connects 10 Dante™ audio inputs, 2 analog inputs, USB, and a mobile device to an A/V conferencing system
or a PC-based videoconferencing application
• Includes Shure DSP algorithms to enhance audio quality in A/V conferences: 8 channels of AEC (acoustic echo
cancellation), noise reduction, and automatic gain control, combined with IntelliMix automatic mixing, matrix
mixing, delay, compressor and parametric equalization
• Flexible signal routing and connectivity: analog audio (2 block in / 2 block out) to connect to room A / V confer
encing system; USB (1 in / out) to connect to laptop or room PC; one 3.5 mm TRRS jack to connect to a mobile
device to enable an additional participant to join
• Power over Ethernet Plus (PoE+) eliminates the need for an outboard power supply
• Compact form factor is easy to mount without equipment rack
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Getting Started
This device features a browser-based web application, which controls audio and network properties. Upon com
pleting this basic setup process, you will be able to:
• Access the web application to customize audio settings, signal routing, and network properties
• Use Dante Controller software to connect with other Dante devices and pass audio
• Access additional configuration information
Step 1: Connect to a Network
1. Use an Ethernet cable (CAT5e or higher) to connect the P300 to a network switch.
Note: The network switch must provide Power over Ethernet Plus (PoE+). Make sure to connect to a PoE+
port, since many switches do not supply power on all ports.
2. Connect a computer to the network switch with an Ethernet cable
Step 2: Access the Web Application
1. Download and install the Shure Device Discovery application (http://www.shure.com)
2. Open the Shure Device Discovery application
3. Double-click the device to open the web application.
Tip: If setting up multiple Shure devices, use the Identify button in the application to flash the lights on the de
vice.
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Step 3: Connect Devices in Dante Controller Soft
ware
1. Download and install Dante Controller Software from http://www.audinate.com
2. Use Dante Controller to create connections with other Dante devices.
3. Important: For Shure devices with integrated automatic mixing (such as the MXA910), connect independent
channels to the P300 Dante input channels to ensure effective acoustic echo cancellation.
Note: Refer to the Dante Controller user guide for more information on channel routing (available at http://
www.audinate.com/resources/technical-documentation)
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Example: Connecting the P300 and Shure MXA910
1. Find the MXA910 in the list of Dante transmitters, and select the plus sign (+) to show all channels.
2. Find the P300 in the list of Dante receivers, and select the plus sign (+) to show all channels.
3. Connect channels 18 from the MXA910 to Dante input channels 18 on the P300. Do not use the automix out
put from the MXA910 into the P300.
Step 4: Configure Audio
The final configuration steps will vary, depending on the signal processing required and hardware connected to the
P300. These steps provide a general guideline. Specific steps are included in the system examples.
1. Connect analog, USB, and mobile audio devices
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2. Route signals in the matrix mixer
3. Adjust input and output levels in the input and output tabs
4. Turn on digital signal processing blocks as needed
5. Set the AEC reference channel by opening the AEC menu in the schematic view or inputs tab and selecting a
channel from the pull-down menu. Use the channel that carries audio to loudspeakers as the AEC reference.
Analog -- To Speaker is the most common channel for this application, in configurations using an analog loud
speaker system or the built-in speaker on a display.
More comprehensive information is available in the help section of the web application.
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Get More Information
Now that the basic setup is complete, you should have access to the web application and be able to pass audio
between devices. More comprehensive information is available online and in the help section, including:
• Maximizing audio quality with the built-in parametric equalizer
• External control system command strings
• Signal routing
• System scenario diagrams
• Software configuration
• Networking information
• Troubleshooting
• Replacement parts and accessories
The complete user guide is available at http://pubs.shure.com/guide/P300 (http://pubs.shure.com/guide/ANIUSBMATRIX)
System Planning and Gear Requirements
USB Computer System
1. Connect the computer to the USB port on the P300
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2. Connect a powered loudspeaker or amplifier to the P300 analog output 2. In the matrix mixer, this is labeled
Analog - To Speaker.
3. In the P300 web application, open the matrix mixer to make connections between devices.
Note: Some connections are established in the matrix mixer by default. Refer to the matrix mixer help topic in
the web application for additional information.
Required Matrix Mixer Connections:
Input Output
Automix USB output
USB input Analog - To Speaker
4. In the schematic view, right-click any AEC block and set the AEC reference channel to Analog - To Speaker.
5. In the web application, adjust input and output levels and perform a sound check. Refer to the help topics in the
web application for additional information.
Connecting a USB Device
The USB port connects the host computer to the entire room audio system, including microphones and loudspeak
ers.
When the P300 is connected for the first time, the computer recognizes it as a USB audio device. You may need to
select it as the input/output (recording/playback) device to pass audio. Assign the P300 as the default device to
ensure it passes audio every time it is plugged in. Refer to the manual for your computer to configure the audio
settings.
Adapter Compatibility
This device is compatible with USB-B to USB-C adapters. Using an adapter is only recommended for desktop and
laptop computers, as many mobile devices do not support bi-directional audio through USB or lightning ports.
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Hardware Codec System
1. Connect the hardware codec audio output to the P300 analog input 1. In the matrix mixer, this is labeled Ana
log - From Codec.
2. Connect the hardware codec audio input to the P300 analog output 1. In the matrix mixer, this is labeled Ana
log - To Codec.
3. Connect a powered loudspeaker or amplifier to the P300 analog output 2. In the matrix mixer, this is labeled
Analog - To Speaker.
4. In the P300 web application, open the matrix mixer to make connections between devices.
Note: Some connections are established in the matrix mixer by default. Refer to the matrix mixer help topic in
the web application for additional information.
Required Matrix Mixer Connections:
Input Output
Automix Analog - To codec
Analog - From Codec Analog - To Speaker
5. In the schematic view, right-click any AEC block and set the AEC reference channel to Analog - To Speaker.
6. In the web application, adjust input and output levels and perform a sound check. Refer to the help topics in the
web application for additional information.
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Mobile Phone System
In this example, when the phone is plugged in, the builtin microphone and speaker are disabled the phone sim
ply carries the call. The MXA310 microphone captures near-end audio, and the loudspeaker delivers audio from
the far end of the call.
1. Connect the phone to the P300 with a 1/8-inch TRRS cable
2. Connect a powered loudspeaker or amplifier to the P300 analog output 2. In the matrix mixer, this is labeled
Analog - To Speaker.
3. In the P300 web application, open the matrix mixer to make connections between devices.
Note: Some connections are established in the matrix mixer by default. Refer to the matrix mixer help topic in
the web application for additional information.
Required Matrix Mixer Connections:
Input Output
Automix Mobile output
Mobile input Analog - To Speaker
4. In the schematic view, right-click any AEC block and set the AEC reference channel to Analog - To Speaker.
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5. In the web application, adjust input and output levels and perform a sound check. Refer to the help topics in the
web application for additional information.
Mobile Connection Cable Requirements
A 1/8-inch TRRS cable is required to connect a phone to the P300. Avoid using cables with a metal flange, as it
may create an electrical connection to the exterior of the phone and interrupt the signal.
To ensure proper operation, only use:
• Apple-approved cables
• Cables with a plastic or non-conductive flange
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Note: If necessary, a TRS (tip/ring/sleeve) cable may be used to plug a stereo device into the P300, but the device
will only be able to send audio to the P300. The Enable auto-mute feature (located in the mobile channel of the in
put section in the web application) must be turned off in this case.
Optimizing P300 Audio Performance with
MXA910 and MXA310 Microphones
The P300 features templates for pairing with Shure microphone systems, and microphone optimization modes in
the automixer to ensure best performance with all equipment combinations. Disabling the signal processing on the
MXA910 and MXA310 is critical to achieve the best possible audio quality. See the process for each microphone
later in this topic.
P300 Configuration
Templates
Select a template to automatically adjust all DSP settings to match the microphone. Because room acoustics are
highly variable, equalizer settings are not included in templates and must be set manually.
Automix Mic Optimization Setting
Note: If using a template, the mic optimization setting is automatically entered.
Select the microphone that is used with the automixer for best performance.
Use MXA910 or MXA310 when using a Shure Microflex Advance™ Ceiling Array or Table Array microphone.
Important: Disable the low-shelf filter (MXA910), low-cut filter (MXA310), and all equalization on the microphones
for the best performance with mic optimization.
Use the Off setting when using a Shure Microflex Wireless system, or traditional wired microphones. If using wired
microphones, use the Shure ANI4IN Network Interface to bring the microphones onto the Dante network.
®
MXA910 and MXA310 Configuration
To Optimize P300 + MXA910 Audio Performance:
1. Open the MXA910 web application
2. Disable the Low Shelf Filter
3. On every channel, disable the equalizer and set the input gain to 0
4. If equalization is needed, use the P300 equalizers
To Optimize P300 + MXA310 Audio Performance:
1. Open the MXA310 web application
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2. Disable the Low Cut Filter
3. On every channel, disable the equalizer and set the input gain to 0
4. If equalization is needed, use the P300 equalizers
Hardware and Installation
P300 Hardware
Rear Panel
Front panel
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① Mobile Input TRRS mobile input connects to a mobile device. Supports bidirectional audio with
a TRRS cable, or sends audio into the P300 with a TRS cable.
Note: See the cable requirements topic for additional information
Pin Assignments:
Tip Audio Input (Left)
Ring 1 Audio Input (Right )
Ring 2 Ground
Sleeve Audio Output (To Phone)
Note: Left and Right audio signals are summed to a mono signal.
② Audio Inputs (Block
Connector)
③ Chassis Ground
Screw
④ Audio Outputs (Block
Connector)
Balanced audio input connects to an analog audio device. Set the analog input lev
el in the web application to match the output level of the analog device. Input sen
sitivity:
Line (+4 dBu)
Aux (-10 dBV)
Block Pin Assignments:
Audio +
Audio -
Audio ground
Provides an optional connection for microphone shield wire to chassis ground.
Balanced audio output connects to an analog device. Set the output level in the
web application to match the input sensitivity of the analog device (Line, Aux, or
Mic level).
Audio +
Audio -
Audio ground
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⑤ USB Port Connects to a computer to send and receive audio signals. Use the matrix mixer to
sum any combination of signals from the P300 into a single mono channel and
send through the USB output.
⑥ Dante Network Port Connects to a network switch to connect Dante audio, Power over Ethernet (PoE),
and data from the control software.
⑦ Reset Button Resets the device settings back to the factory default
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⑧ LED Indicators
Power: Power over Ethernet Plus (PoE+) present
Note: Use a PoE+ injector if your network switch does not supply PoE+.
Network: Ethernet connection activeNetwork Audio: Dante audio present on the
network Network Audio LED Behavior
LED Status Activity
Off No active signal
Green Device is operating successfully
Red Error has occurred. See event log for
details.
Encryption:
LED Status Activity
Off Audio not encrypted
Green Encryption enabled
Red Encryption error. Possible causes:
• Encryption is enabled on one de
vice and not on another
• Passphrase mismatch
USB Audio
LED State Status
Off No USB device connected
Green USB device operating successfully
Red (flashing) Problem detected with connected USB
audio device
Note: Error details are available in the event log in the web application.
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⑨ Level Indicators (Sig
nal/Clip)
Tri-color LEDs indicate the audio signal level for the analog channels. Adjust output
levels in the web application to avoid clipping.
Analog Input/Output
LED State Audio Signal Level
Off less than -60 dBFS
Green -60 dBFS to -18 dBFS
Yellow -18 dBFS to -6 dBFS
Red -6 dBFS or more
Note: The input and output LEDs stay off when metering is set to Post Fader and
the channel is muted in the web application.
Installation and Rack Mounting
Two mounting solutions are available for installing the P300:
CRT1 19" Rack Tray (optional accessory): Supports up to 2 devices (two P300s or one P300 and one ANI4IN,
ANI4OUT, ANI22, or ANIUSB); mountable in a rack or under a table
Single-unit Mounting Tray (included accessory): Supports a single device for mounting under a table
Securing the Devices
Use the included screws from the mounting hardware kit to secure each P300 or Audio Network Interface (ANI).
Devices can be mounted to face either direction. Insert the screws from the bottom in the appropriate holes, ac
cording to the following diagrams:
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Align the holes as shown for securing a single device in the single-unit mounting tray
Align the holes as shown for securing up to two devices in the 19" rack tray.
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Rack Ear Configuration (CRT1)
The adjustable rack ears support mounting in a standard equipment rack or underneath a table.
Standard 19" Rack Mount
1. Align the ears with the mounting holes pointed forward.
2. Install the two screws that hold the ear to the tray as shown.
Under-table Mounting
1. Align the ears with the mounting holes pointed upward.
2. Install the two screws that hold the ear to the tray as shown.
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Installing Underneath a Table
1. Hold the tray in the desired location under a table
2. Use a pencil to mark the location of the mounting holes on the table.
3. Drill 4 holes for the screws. The diameter of the holes in the tray are 7.1 mm.
4. Install the components into the tray
5. Install with 4 screws to secure the tray underneath the table
Power Over Ethernet Plus (PoE+)
This device requires PoE Plus to operate. It is compatible with both Class 4 PoE+ sources.
Power over Ethernet is delivered in one of the following ways:
• A network switch that provides PoE+
• A PoE+ injector device (must be a Gigabit device)
Cable Requirements
Always use Cat5E cable or higher.
Reset
The reset button is located inside a small hole in the rear panel. Use a paperclip or other small tool to press the
button.
There are two hardware reset functions:
Network reset (press but
ton for 4-8 seconds)
Resets all Shure control and audio network IP settings to factory defaults
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Full factory reset (press
button for longer than 8
seconds)
Restores all network and web application settings to the factory defaults.
Software Reset Options
Reboot Device:In the web application (settings > factory reset), there is a Reboot Device button, which simply
powercycles the device as if it were unplugged from the network. All settings are retained when the device is re
booted.
Restore Factory Defaults: In the web application (settings > factory reset), this restores all network and web ap
plication settings to the factory defaults. This is the same as performing a full factory reset using the reset button
on the device.
Default Settings Preset: To revert audio settings back to the factory configuration (excluding Device Name, IP
Settings, and Passwords), select Load Preset and choose the default settings preset.
Device Identification
To identify the hardware by flashing the lights, select the Identify button in the navigation menu located on the left
side of the web application.
The Identify button appears as an icon when the menu is collapsed.
Schematic View
The schematic view in the web application provides an overview of the entire signal chain, with the ability to adjust
settings and monitor signals.
Adjusting Settings
Right-click an input, output, or processing block to access the following options:
Per Channel
Copy / paste
Copy and paste settings between items. For example, set the equalizer curve on
the USB output, and then use the same setting for the analog output. Or, copy the
gain and mute status from one input channel to several others.
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Per Channel
Mute / unmute
Enable / disable Turns processing on or off (does not apply to matrix mixer or automixer)
Edit Opens the dialog to adjust parameters
Global (right-click in
blank area)
Mute all inputs
Mute all outputs Mutes all output channels
Unmute all inputs Unmutes all input channels
Unmute all outputs Unmutes all output channels
Close all dialogs Clears all open dialogs from the workspace
Mutes or activates the channel
Mutes all input channels
Customizing the Workspace
Create a custom environment to monitor and control a set of inputs, outputs, and processing blocks from a single
screen. There are two ways to break out dialogs:
• Right click > edit
• Double-click the input, output, or processing block.
Open as many dialogs as you need to keep important controls available.
Metering and Signal Flow
A meter appears underneath each input and output to indicate signal levels (dBFS).
The lines connecting inputs and outputs to the matrix mixer appear colored when connections are established.
When a signal is not routed, the line appears gray. Use these tools to troubleshoot audio signals and verify con
nections and levels.
Matrix Mixer
The matrix mixer routes audio signals between inputs and outputs, for simple and flexible routing:
• Send a single input channel to multiple outputs
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• Send multiple input channels to a single output
Routing Channels
Connect inputs and outputs by selecting the box where they intersect.
Important: Dante devices must be routed in Dante Controller software to pass audio to or from a Dante device.
Default Setting
The default configuration enables calling to multiple far ends with near-end Shure Microphones. Connections are
established for operating hardware codecs, software codecs, and mobile phones simultaneously.
Input / Source Channel Output / Destination Channel
Automix (summed Dante input channels) Analog - To Codec (Analog output 1)
USB output
Mobile output
Analog - From Codec (Analog input 1) Analog - To Speaker (Analog output 2)
USB output
Mobile output
USB input Analog - To Codec (Analog output 1)
Analog - To Speaker (Analog output 2)
Mobile output
Mobile input Analog - To Codec (analog output 1)
Analog - To Speaker (analog output 2)
USB output
Crosspoint Gain
Crosspoint gain adjusts the gain between a specific input and output, to create separate submixes without chang
ing input or output fader settings. Select the dB value at any crosspoint to open the gain adjustment panel.
Gain staging: input fader > crosspoint gain > output fader
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Example Scenario: Connecting a Three-Way Call
Near-end audio from Dante microphones (Shure MXA 310) and the mobile phone are both routed to the video
codec and sent to the far end. The mobile phone is simply carrying the audio from the remote caller -- its built-in
microphone and speaker are disabled.
Far-end audio from the video codec is routed to a powered loudspeaker or amplifier (analog or Dante-enabled). It
is also routed to the mobile phone (connected to the P300) to relay the signal to the remote caller.
The remote caller (far end) receives audio from both the near-end and far-end locations. The P300 connects all
locations by routing both near and far-end audio sources through the mobile output. The audio from the remote
caller is routed to the mobile input, and then sent to the loudspeakers in the near-end room and through the video
codec to the far-end room.
Input / Source Channel Output / Destination Channel
Automix (four summed Dante input channels from
MXA310)
Analog - From Codec (analog input 1) Analog - To Speaker (analog output 2)
Analog - To Codec (analog output 1)
Mobile output
Mobile output
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Input / Source Channel Output / Destination Channel
Mobile input Analog - To Codec (analog output 1)
Analog - To Speaker (analog output 2)
Mute and Fader Groups
Mute Groups Check the Mute group box to add the channel to a group. Muting any channel with
in the Mute group mutes all channels in the group.
Fader Groups Check the Fader group box to add the channel to a group. All faders within the
group are linked, and move together when a single fader is adjusted.
Custom Presets
Use presets to quickly save and recall settings. Up to 10 presets can be stored on each device to match various
signal processing requirements, room types, and microphones used. A preset saves all device settings except for
the Device Name, IP Settings, and Passwords. Importing and exporting presets into new installations saves time
and improves workflow. When a preset is selected, the name displays above the preset menu. If changes are
made, an asterisk appears next to the name.
Note: Use the default settings preset to revert to the factory configuration (excludes Device Name, IP Settings,
and Passwords).
Open the presets menu to reveal preset options:
save as preset: Saves settings to the device
load preset: Opens a configuration from the device
import from file: Downloads a preset file from a computer onto the device. Files may be selected
through the browser or dragged into the import window.
export to file: Saves a preset file from the device onto a computer
Logic
The enable logic feature on all Dante input channels makes it possible to use a microphone mute button to send a
mute command to the P300. The button on the microphone triggers the P300 to mute the audio after the acoustic
echo canceller and the automatic mixer, so the processors continue operating when the system needs to be mut
ed. In many configurations, this eliminates the need for an external control system, which is often needed in a sys
tem with an acoustic echo canceller. Enabling logic on any channel activates the setting on all Dante channels
(1-8).
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This feature works with Shure MXA310 table array microphones and MXA910 ceiling array microphones, or with
the Shure ANI4IN network interface (when paired with analog microphones that support logic functionality).
Note: the MXA910 requires an MXA310 or control system to send the logic signal to the P300.
The automixer mix out channel in the P300 web application has a mute button, which responds to the logic control
device (MXA310 or control system) when logic is enabled. When the automix mute button is pressed in the P300
web application, the LED on the microphone (MXA910 or MXA310) changes to show that the system is muted.
Important MXA310 microphone configuration steps:
• The microphone logic setting must be set to external control in the MXA310 web application. This must be done
for each microphone.
• If using the automix out channel from the MXA310 (instead of sending 4 individual MXA310 channels to the
P300 automixer), the MXA310 LED must be set to Ring instead of Segments.
Adjusting Input levels
Levels for Dante, analog, USB, and mobile channels are adjustable in the Input tab and in the schematic view.
To monitor input levels before they reach the P300, set the metering to prefader in the settings menu. When ad
justing the faders, set metering to post-fader.
Digital Sources (Dante and USB)
1. Check the source level before it reaches the P300:
◦ Verify that the networked microphones or other Dante sources are operating at nominal output levels.
◦ Set USB volume on the computer to the maximum setting if the volume control is accessible.
◦ Levels for Microflex Advance™ and Microflex Wireless microphones are adjustable through their web appli
cation.
2. Adjust the digital gain in the P300 web application:
◦ Use the faders or manually enter a gain value.
◦ The digital gain adjusts the level of the signal before it reaches the matrix mixer.
◦ Mix the levels as high as possible without the loudest channel reaching the peak level (0 dB) on the meter.
Note: The matrix mixer provides crosspoint gain, to adjust separate submixes for different outputs.
Analog Sources (Line Inputs)
Before you begin, verify that levels from the analog devices with adjustable output levels are operating at nominal
levels. The fader adjusts the digital gain before the signal reaches the matrix mixer.
1. Match the analog input level setting according to the incoming signal level:
Line (+4 dBu)
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Aux (-10 dBV)
2. Use the fader (digital gain) to adjust the mix going to the USB or Dante output channels.
Mobile Devices
The mobile device input gain is optimized for most devices when the fader is set at zero, to provide adequate vol
ume with sufficient headroom. As a general target, the audio signal received by the P300 from the phone should
reach an average level of approximately -24 dBFS.
1. Set a phone at approximately 50% volume
2. Make a test call to verify the following:
◦ Can the far-end talker be clearly heard?
◦ Can the far-end talker clearly hear audio from the near end?
If the signal being sent to the farend is quiet, verify the gain levels for the nearend microphones and the automix
er have been properly set.
Adjusting Output Levels
Tip: Set the output metering in the settings menu to ensure accurate metering.
Adjust faders in the Outputs section as high as necessary, but make sure to avoid clipping (when the signal reach
es 0 dBFS). Always adjust the input gain and crosspoint gain in the matrix mixer before the output gain.
Analog output level:Select Line, Aux, or Mic level output signal to match the sensitivity of the receiving device.
Pre- and Post-Fader Metering
The two metering modes allow you to monitor signal levels before and after gain stages.
Input Metering
When set to pre-gain, the meter displays the signal level at the inputs of the P300. If signals are too low or clip
ping, adjust them at the source.
When set to post-gain, the meter is affected by gain adjustments from the input channel faders. This does not in
clude automatic gain control or any other processing.
Output Metering
When set to pre-gain, the meter displays signal levels after gain has been applied at the input stage, but before
the output faders. This includes input faders, digital signal processing blocks, automixing, and crosspoint gain.
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When set to post-gain, the meter indicated the signal sent to each output. This includes gain adjustments made
on the output faders .
Automatic Gain Control (AGC)
Automatic gain control adjusts channel levels to ensure consistent volume for all talkers, in all scenarios. For qui
eter voices, it increases gain; for louder voices, it attenuates the signal.
The automatic gain control is postfader, and adjusts the channel level after the input level has been adjusted. En
able it on channels where the distance between the talker and the microphone may vary, or in rooms where many
different people will use the conferencing system.
Target Level (dBFS) Use -30 dBFS as a starting point to ensure adequate headroom, and adjust if nec
essary. This represents the RMS (average) level, which is different from setting the
input fader according to peak levels to avoid clipping.
Maximum Boost ( dB) Sets the maximum amount of gain that can be applied
Maximum Cut ( dB) Sets the maximum attenuation that can be applied
Tip: Use the boost/cut meter to monitor the amount of gain added or subtracted from the signal. If this meter is al
ways reaching the maximum boost or cut level, consider adjusting the input fader so the signal is closer to the tar
get level.
Parametric Equalizer
Maximize audio quality by adjusting the frequency response with the parametric equalizer. Use the input equaliz
ers to make adjustments to specific channels, while using the output equalizers to adjust frequency response of all
signals that are summed through a given output.
Common equalizer applications:
• Improve speech intelligibility
• Reduce noise from HVAC systems or video projectors
• Reduce room irregularities
• Adjust frequency response for reinforcement systems
2-Band Equalizers
Adjust filter settings by manipulating the icons in the frequency response graph, or by entering numeric values.
Disable a filter using the check-box next to the filter.
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Filter Type Each band has a selectable filter:
Low Cut: Rolls off the audio signal below the selected frequency
Low Shelf: Attenuates or boosts the audio signal below the selected frequency
High Cut: Rolls off the audio signal above the selected frequency
High Shelf: Attenuates or boosts the audio signal above the selected frequency
Frequency Select the center frequency of the filter to cut/boost
Gain Adjusts the level for a specific filter (+/- 30 dB)
4-Band Equalizers
Adjust filter settings by manipulating the icons in the frequency response graph, or by entering numeric values.
Disable a filter using the check-box next to the filter.
Filter Type Only the first and last band have selectable filter types.
Parametric: Attenuates or boosts the signal within a customizable frequency
range
Low Cut: Rolls off the audio signal below the selected frequency
Low Shelf: Attenuates or boosts the audio signal below the selected frequency
High Cut: Rolls off the audio signal above the selected frequency
High Shelf: Attenuates or boosts the audio signal above the selected frequency
Frequency Select the center frequency of the filter to cut/boost
Gain Adjusts the level for a specific filter (+/- 30 dB)
Q Adjusts the range of frequencies affected by the filter. As this value increases, the
bandwidth becomes thinner.
Width Adjusts the range of frequencies affected by the filter. The value is represented in
octaves.
Note: the Q and width parameters affect the equalization curve in the same way.
The only difference is the way the values are represented.
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