The AXT400 Dual Channel Receiver combines advanced analog and digital technology to deliver exceptional RF and audio performance. The receiver features ShowLink™ Remote Control for real-time transmitter adjustments, Frequency Diversity mode for seamless dual-frequency operation, and Interference Detection & Avoidance. It offers up to 228 MHz of wideband tuning and supports Axient and UHF-R series transmitters. Connectivity options include transformer balanced audio outputs, AES3 digital audio output, RF Cascade ports and dual Ethernet ports for networked control and monitoring via Shure Wireless Workbench® 6 software.
The AXT400 offers comprehensive real-time remote control of a linked transmitter when used with the AXT610 ShowLink Access Point. Axient transmitters can be Linked to each receiver channel using the Infrared Sync feature. The ShowLink Access Point maintains a 2.4 GHz wireless network communication with the transmitters and connects to the receiver over Ethernet. All functions of the Linked transmitter including gain adjustments and synchronized frequency changes can be controlled from the front panel menu of the AXT400 in real-time.
During operation, the AXT400 receiver can detect the presence of an interfering analog or digital signal. When a potential interference source is detected, a warning message is displayed along with options for changing frequency. When used with the AXT600 Spectrum Manager, the receiver can switch to a ‘backup’ frequency deployed by the Spectrum Manager, either manually or automatically. The Spectrum Manager constantly monitors a compatible frequency list to ensure the best available frequencies are used. With ShowLink™ Remote Control, the receiver and transmitter can execute a synchronized switch to a clear frequency, resolving the interference.
Frequency Diversity provides seamless audio in environments where there is a risk of dropouts or interference by using transmission from a single audio source on two independent radio frequencies. In Frequency Diversity mode, the AXT400 Receiver continuously analyzes signal quality and uses both signals to provide optimized audio on a single channel. In the case of RF interference on one frequency the receiver automatically uses the other frequency, delivering clean, uninterrupted audio.
Up to 228 MHz tuning bandwidth accommodates multiple transmitter bands, providing flexibility and simplifying receiver inventories. A single receiver can cover the entire US UHF TV band.
The AXT400 Receiver shares information with other system components via Ethernet, enabling advanced features such as remote control of transmitters and management using WWB 6 software. The receiver has two RJ45 Ethernet ports capable of 10/100 Mbps network speeds. The Ethernet ports are power over Ethernet (PoE) enabled, which can be used to supply power to a ShowLink Access Point. To verify the network is correctly configured, the list of network-ready devices can be identified using the Find All utility in the front panel menu.
The receiver includes a wide selection of frequency Groups which allow easy access to compatible Channels for multiple receivers. Channel Scan finds an open frequency within the current Group. Group Scan finds the open Channels in all Groups and allows easy programming of compatible frequencies to other AXT400 receivers over the network.
The cascade ports share RF signal with up to 5 receivers within the same frequency band. RF cascade allows antenna signal to be conveniently distributed for up to 10 channels without using splitters or distribution amplifiers.
The receiver is compatible with the following Shure transmitters:
|1-foot Coaxial Cascade Cable (2)||95N2035|
|IEC AC Power Cable (1)||95A9128|
|IEC AC Extension Cable (1)||95A9129|
|Shielded 3-foot Ethernet Cable (1)||C803|
|Shielded 8-inch Ethernet Jumper Cable (1)||C8006|
|Hardware Kit (1)||90XN1371|
|22-inch Coaxial Cable* (1)||95B9023|
|33-inch Coaxial Cable* (1)||95C9023|
* with integrated bulkhead for front mounting antennas.
This component is designed to fit into an audio rack.
WARNING: To prevent injury this apparatus must be securely attached to the rack.
① Sync - Infrared (IR) Port
Infrared (IR) port. For sending parameter presets (IR Preset) to a transmitter and linking the transmitter and receiver to the same channel.
② Squelch LEDs
③ RF LEDs
Indicates the RF signal strength from the transmitter.
④ Audio LEDs
Indicates the audio signal strength from the transmitter.
To correct an overload, adjust the transmitter gain.
⑤ LCD display
Each channel has an LCD display for viewing settings and parameters.
⑥ Menu navigation buttons
Use to select and navigate through parameter menus.
⑦ Enter button
The Enter button flashes when an action or parameter change is pending. Press Enter to save the value.
⑧ Exit button
Cancels parameter changes or returns to a previous menu screen.
⑨ Control wheel
Tip: Press and hold the control wheel for 1 second to activate the Hardware Identify feature in WWB.
⑩ Monitor clip LED
Indicates audio overload when illuminated.
⑪ Monitor output LED
Indicates channel selection for monitoring.
⑫ Monitor volume knob
Adjusts monitor volume. Push to monitor channel 1 or channel 2.
⑬ Monitor jack
6.5 mm (1/4”) output jack for headphones.
⑭ Power switch
Power the unit on or off.
|① AC power primary switch||AC main power switch.|
|② AC power in||IEC connector 100 - 240 V AC.|
|③ AC power cascade||Use IEC extension cables to connect up to 5 rack components to a single AC power source.|
|④ Network speed LED (amber)||
|⑤ Ethernet ports: Class 1 PoE enabled (2)||Connect to an Ethernet network to enable remote control and monitoring.|
|⑥ Network status LED (green)||
|⑦ Word clock input||Connect to resolve the AXT400 AES3 digital output to an external word clock source.|
|⑧ Word clock thru output||Passes word clock signal to additional components.|
|⑨ Word clock termination switch||Set to thru when passing signal to additional components. Set to 75Ω when thru connection is not used.|
|⑩ AES3 digital audio output||24-bit digital audio output for channel 1 and channel 2.|
|⑪ Line/Mic switch||Changes the output level 30 dB (XLR outputs only).|
|⑫ Transformer balanced XLR audio output||For channel 1 and channel 2.|
|⑬ Ground lift switch||Lifts the ground from pin 1 of the XLR connector and the sleeve of the ¼” jack.|
|⑭ Transformer balanced 1/4" output jack||For channel 1 and channel 2.|
|⑮ RF antenna input jacks||For antenna A and antenna B.|
|⑯ RF input status LED||Indicates the voltage status of the RF input.
|⑰ RF cascade ports||Passes the RF signal from one receiver to the next, allowing up to 5 receivers to share a single pair of antennas.|
|⑱ Temperature activated fan||Ensures top performance in high temperature environments. Clean fan screen as needed to maintain airflow.|
Screen icons indicate the status of advanced features and provide details of receiver settings.
Indicates connectivity with other devices on the network. IP Address must be valid to enable networked control.
Indicates ShowLink control active between the receiver and the Linked transmitter.
Indicates transmitter controls locked.
Displayed when the receiver channel is Linked to a transmitter.
Frequency Diversity Bodypack Mode
Frequency Diversity configured for use with bodypack transmitters.
Frequency Diversity Handheld Mode
Frequency Diversity configured for use with handheld diversity transmitters.
Appears next to the tuned frequency if it is not included in the compatible frequency list (CFL) of the Spectrum Manager.
References the source of the currently tuned frequency. For example, a Group and Channel or the Device ID of a Spectrum Manager currently controlling the receiver.
Displays the current level of the audio output (0 to -30 dB or Mute)
In Talk Switch mode, the switch configuration is displayed: (TS-TRS, TS-XLR, TS-Toggle)
Note: varies by region
Displays the TV channel that contains the tuned frequency.
Access Control Icon
Displayed when Access Control PIN is enabled from Shure control software.
The home menu displays a summary of receiver parameters and the top-level menu choices. When a transmitter is received, its key settings are displayed.
① Audio channel name
The audio channel name is shared by a receiver and a Linked transmitter
② Frequency setting
The tuned frequency of the receiver
③ Radio menu
Select to access Radio sub-menus
④ Audio menu
Select to access Audio sub-menus
⑤ Util menu
Select to access Utility sub-menus
Select to access Transmitter sub-menus
⑦ Received Transmitter Data
Solid line: Receiving signal from a Linked transmitter
Dashed line: Received signal is not from a Linked transmitter
⑧ Transmitter Device ID
Displays the Device ID or model number of the received transmitter
⑨ Transmitter Gain
Gain setting for received transmitter
⑩ RF Power
Power level for received transmitter
⑪ Lock Status
Icon indicates transmitter controls locked
⑫ Battery Life
Remaining runtime for the transmitter battery is displayed numerically, alternating with a segmented battery icon. Displays battery fault codes.
The receiver uses an Ethernet connection to network with other components. For automatic network configuration, use a DHCP enabled Ethernet switch such as the Shure AXT620 or an Ethernet router with DHCP service. Use multiple Ethernet switches to extend the network for larger installations.
Note: For smaller systems, connect the receivers to one another using the Ethernet ports on the back panel. The devices fall back to compatible addresses if the IP mode is set to automatic and there is no DHCP server.
Use only one DHCP server per network
All devices must share the same subnet mask
All devices must have the same level of firmware revision installed
Look for the network icons on the display of each device:
Use the Find All utility () to view devices on the network:
To check connectivity of WWB6 to the network:
Adding a ShowLink Access Point enables remote control of a linked Axient transmitter from the front panel of the receiver.
When a linked transmitter is within range of a ShowLink Access Point, the transmitter adjustment menu is enabled.
To check the ShowLink network and connectivity, you can use the ShowLink test mode in the AXT400 receiver:
Dual Digital Signal Processors (DSP) in the receiver analyze the RF signal for signs of interference that can degrade the audio signal. When interference is present, the receiver screen turns red and displays one of the following warning messages:
Displayed on the home screen when low-level interference is detected. Interference at this level may not be audible or may only cause a slight disruption to the audio signal. All receiver controls can still be accessed, and If the interference is not audible, a frequency change may not be necessary.
If Interference Avoidance is set to Auto mode, a frequency change will not occur unless the strength of the interference increases to trigger an Interference Detected message.
Displayed when high-level interference likely to disrupt the audio signal is detected. The menu screen displays on-screen options for changing to a clear frequency or if Interference Avoidance mode is set to Auto, the channel will automatically switch to a clear frequency deployed by the Spectrum Manager.
If the Interference clears without being addressed or if a frequency change is made by the Spectrum Manager, the LCD screen will return to its normal color. The detection message indicating time elapsed since the interference occurred will remain on the screen for up to 60 minutes or until dismissed.
When Avoidance mode is set to Prompt, the following on-screen options are available when interference is detected:
The sensitivity setting allow you to vary the timing of warning messages to match the RF conditions and the need to avoid interference.
Set to the Receiver to the same frequency band as the transmitter.
The IR Sync function forms a link between a transmitter and the receiver and automatically sets the transmitter frequency.
Frequency Diversity uses two independent radio frequencies sent from an AXT200 handheld transmitter or from two AXT100 bodypack transmitters connected with a "Y" cable to deliver a single uninterrupted audio channel. To optimize performance, Frequency Diversity mode must match the transmitter type.
To set Frequency Diversity mode:
Note: varies by region
|Under typical conditions||150 m (500 ft)|
|Line of Sight, outdoors for a single system||500 m (1600 ft)|
Note: Actual range depends on RF signal absorption, reflection and interference.
– 18 kHz (+1, -3 dB)
Note: Dependent on microphone type
45 kHz max. deviation
FM, Audio Reference Companding with pre- and de-emphasis
A-weighted, 1% THD
|XLR Output||>118 dB|
|AES3 Output||>130 dB|
>120 dB, typical
-110 dBm for 12 dB SINAD, typical
>110 dB, typical
>110 dB, A-Weighted
>115 dB, A-Weighted
45 kHz max. deviation
<0.3%, A-weighted, typical
Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low-impedance output) and the tip of the high impedance 1/4-inch output.
0 to -30 dB (in 1 dB steps), plus Mute setting
44 mm x 483 mm x 366 mm (1.7 in. x 19.0 in. x 14.4 in.), H x W x D
5.5 kg (12.0 lbs)
Steel; Extruded aluminum
100 to 240 V AC, 50-60 Hz
1.1 A RMS (referenced at 120 V AC)
-18°C (0°F) to 63°C (145°F)
-29°C (-20°F) to 74°C (165°F)
12 V DC, 150 mA (300 mA maximum)
Unbalanced, filtered to receiver band
|AES3 Type 1, XLR connector||Channel 1||Left|
50 V DC, Class 1
Dual Port Ethernet 10/100 Mbps
DHCP or Manual IP address
|Monitor||Unbalanced mono, 1/4 in. (will drive stereo phones)|
|6.35 mm (1/4")||Transformer Coupled Balanced|
|XLR||Transformer Coupled Balanced|
|6.35 mm (1/4")||<50 Ω|
45 kHz max. deviation
|Monitor||1 W@ 63 Ω|
|6.35 mm (1/4")||9 dBu|
|6.35 mm (1/4")||Tip||audio +|
|6.35 mm (1/4")||Yes|
In an audio system containing both AXT400 and UR4 receivers, the overall system audio gain at the XLR (line) output varies depending on the receiver model and the type of transmitter.
The table below offers a comparison of the output gain at the XLR output for AXT400 and UR4 receivers for each transmitter model. Use the information in the table to achieve consistent gain levels when using systems comprised of both Axient series and UR series components.
System gain from transmitter input to receiver XLR output (line) when transmitter gain = 0 dB
|Transmitter||AXT100 Bodypack||AXT200 Handheld||UR1 Bodypack||UR1M Bodypack||UR2 Handheld|
|gain = 0 dB||gain = 0 dB||gain = 0 dB||gain = 0 dB||gain = 0 dB|
|sens = 0 dB||sens = 0 dB|
|Receiver||AXT400||+10 dB gain||+15 dB gain||+15 dB gain||+15 dB gain||+15 dB gain|
|gain setting = 0 dB||UR4||N/A||N/A||+18 dB gain||+18 dB gain||+18 dB gain|
Firmware is embedded software in each component that controls functionality. Periodically, new versions of firmware are developed to incorporate additional features and enhancements. To take advantage of design improvements, new versions of the firmware can be uploaded and installed using the Firmware Update Manager tool available in WWB6 software. Firmware is available for download from http://www.shure.com/wwb.
Meets essential requirements of the following European Directives:
Note: Please follow your regional recycling scheme for batteries and electronic waste
Meets requirements of the following standards:
Approved under the Declaration of Conformity (DoC) provision of FCC Part 15.
Certified in Canada by ISED to RSS-123.
Industry Canada ICES-003 Compliance Label: CAN ICES-3 (B)/NMB-3(B)
Note: EMC conformance testing is based on the use of supplied and recommended cable types. The use of other cable types may degrade EMC performance.
Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.
The CE Declaration of Conformity can be obtained from Shure Incorporated or any of its European representatives. For contact information please visit www.shure.com
The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
75031 Eppingen, Germany
Phone: +49-7262-92 49 0
Fax: +49-7262-92 49 11 4
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: