AT-GAIN-M50-LZ - Switch Atlona - Free user manual and instructions

Product Type	Audio/Video Switch
Model	AT-GAIN-M50-LZ
Brand	Atlona
Dimensions (H x W x D)	1.7 in x 17.5 in x 10.2 in (43 mm x 445 mm x 260 mm)
Weight	5.5 lb (2.5 kg)
Power Supply	AC 100-240V, 50/60 Hz, internal
Power Consumption	30 W (max)
Number of Inputs	5 x HDMI or composite (depending on variant)
Number of Outputs	1 x HDMI or composite
Signal Gain	Adjustable, up to 12 dB
Supported Resolutions	Up to 4K UHD (3840 x 2160 @ 60 Hz)
Audio Formats	Stereo, Dolby Digital, DTS
Control Interface	Front panel buttons, RS-232, IR remote
Rack Mountable	Yes, 1U rack ears included
Cooling	Fanless, passive
Operating Temperature	32°F to 104°F (0°C to 40°C)
Storage Temperature	-4°F to 140°F (-20°C to 60°C)
Care Instructions	Wipe with dry cloth; avoid liquids
Safety Certifications	CE, FCC, RoHS
Spare Parts Availability	Power supply, remote, rack ears (contact support)
Repairability	Modular design; professional service recommended
Warranty	2 years limited

Frequently Asked Questions - AT-GAIN-M50-LZ Atlona

What is the AT-GAIN-M50-LZ used for?

It is a video/audio switch designed to route multiple sources to a single output, with adjustable signal gain to compensate for long cable runs.

Does it support 4K resolution?

Yes, it supports 4K UHD resolutions up to 3840x2160 at 60 Hz with HDCP 2.2.

How do I adjust the gain?

Use the front panel knob or RS-232 commands to increase or decrease gain from 0 to 12 dB in 1 dB steps.

Can I control it via remote?

Yes, it comes with an IR remote and also supports RS-232 for integration with control systems.

What cables do I need?

Use HDMI cables for video/audio. For composite input, use RCA cables. Ensure cables are high-speed for 4K.

How do I clean the device?

Disconnect power and wipe with a soft dry cloth. Do not use liquids or sprays.

Is it rack mountable?

Yes, it is 1U rack mountable with included rack ears. Ensure proper ventilation.

What is the power consumption?

The device consumes up to 30 watts and uses an internal power supply with auto voltage (100-240V).

How do I reset to factory settings?

Press and hold the front panel reset button for 10 seconds using a paperclip until LEDs flash.

Does it support audio extraction?

This model does not have dedicated audio extraction; it passes audio through to the output.

USER MANUAL AT-GAIN-M50-LZ Atlona

50 Watt Mixer Amplifier

AT-GAIN-M50-LZ

The Atlona AT-GAIN-M50-LZ is a two-input mixer amplifier designed for low impedance education and commercial applications. The amplifier delivers either two channels of 25 watts each into 4 or 8 ohms, or a single channel of 50 watts. The GAIN-M50-LZ features two unbalanced stereo audio inputs on RCA and 3.5 mm connections with independent level control for each. An unbalanced 3.5 mm output allows the mixed signal to be passed to an assistive listening system or separate amplifier.

The GAIN-M50-LZ includes unique capabilities intended for education applications. Ducking automatically lowers the program audio level on input 1 when a teacher speaks into a microphone system connected to the unbalanced input 2. PA sense mutes the output of the amplifier whenever it detects activity on the school public address system. Both features ensure important lesson material and announcements are heard clearly.

The compact, plenum rated enclosure allows the amplifier to be mounted in a variety of locations such as under a desk or table, on the wall behind a display, or in the ceiling.

The amplifier includes an RS-232 port for automated operation from Velocity™ or third-party control systems. It also supports remote volume control from the optional AT-GAIN-VOL wallplate.

Package Contents

1 x AT-GAIN-M50-LZ

2 x 2-pin captive screw connectors

2 x 3-pin captive screw connectors

1 x 4-pin captive screw connector

4 x Machine screws

4 x Rubber feet

1 x 24 V / 3 A power supply

1 x AC power cord

1 x Insert w/ QR code

IMPORTANT: Visit https://www.atlona.com/product/at-gain-m50-lz for the latest firmware updates and User Manual.

Front Panel Descriptions

1 FW

Connect a USB-C cable to this port to perform firmware updates. Refer to Updating the Firmware (page 13) for more information.

2 PWR

LED will be green when the AT-GAIN-M50-LZ is powered.

3 IN 1, IN 2, OUT

LED will be green when set to the selected input or output.

4 PORT button

Press this button to select the desired port. Once the port is selected, the port volume can be adjusted.

5 LEVEL

Press these buttons to increase (+) or decrease (-) the audio output volume.

6 MUTE

Press this button to mute the audio output.

7 DUCKING

Press this button to activate the audio ducking feature.

Rear Panel Descriptions

1 INPUT

Connect stereo RCA cables to INPUT 1 and/or connect a 3.5 mm stereo cable to INPUT 2.

2 CTRL / RS-232

Connect the included 3-pin captive screw connectors to these ports. The top port is used for volume control, and the bottom port is used to connect to a control system. Both ports can be used simultaneously.

3 TRIGGER

Connect one of the included 2-pin captive screw connector to this port. Supports audio mute with contact closure or PA sense so announcements can be heard clearly.

4 LOOP

Connect a 3.5 mm stereo cable from this port to an assistive Listening System. This port can also be used to daisy-chain another amplifier to the AT-GAIN-M50-LZ.

5 OUTPUT

Connect the included 4-pin captive screw connector from this port to a pair of program / stereo speakers. Supports 2 x 25 watts @ 4/8 ohms amplifier (stereo or dual mono) or 1 x 50 watts @ 4/8 ohms (bridged).

6 MODE

Set this toggle switch to either STEREO or MONO, based on the speaker configuration of the OUTPUT port, above.

7 SPEAKER

Set this toggle switch to the correct speaker impedance.

8 PA SENSE LED

This LED will be green when PA Sense is active.

9 25V-100V (PA SENSE)

Connect one of the included 2-pin captive screw connector from this port to a PA speaker system.

10 Potentiometer (PA SENSE)

Adjusts the trigger voltage sensitivity.

11 DC 24V / 3A

Connect the included 24 V / 3 A power supply from this port to an available AC electrical outlet.

Installation

1. Connect stereo RCA cables to INPUT 1 and/or connect a 3.5 mm stereo cable to INPUT 2.
2. Connect the included 4-pin captive screw connector from the OUTPUT port to a pair of program / stereo speakers. This port supports 2 x 25 watts @ 4/8 ohms (stereo or dual mono) or 1 x 50 watts @ 4/8 ohms (bridged). Refer to Amplifier Modes (page 6) for more information.
3. Connect one of the included 2-pin captive screw connector from the PA SENSE port to a PA speaker system. Refer to PA Sense (page 7) for more information.
4. Connect one of the included 2-pin captive screw connector from the TRIGGER port to a paging sensor.
5. Connect the included 3-pin captive screw connectors to these ports. The top port is used for volume control, and the bottom port is used to connect to a control system. Both ports can be used simultaneously.
6. Connect a 3.5 mm stereo cable from this port to an assistive Listening System. This port can also be used to daisy-chain another amplifier to the AT-GAIN-M50-LZ.
7. Connect the included power supply to the DC 24V / 3A receptacle. Connect the AC power cord to an available wall outlet.

Wiring Diagram

graph LR
    A["Laptop"] -->|Data| B["AT-OME-FX11-WP"]
    B -->|Data| C["AT-GAIN-VOL"]
    C -->|Data| D["AT-OME-FX11"]
    D -->|Data| E["AT-GAIN-MXD-LZ"]
    E -->|Audio| F["Wireless Microphone"]
    E -->|Audio| G["Public Address System"]
    E -->|Audio| H["Asistative Listening System"]
    E -->|Audio| I[" Speakers"]
    E -->|Audio| J["Projector"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#ffc,stroke:#333
    style I fill:#ccc,stroke:#333
    style J fill:#ccc,stroke:#333
    style_K["Speaker"] --> L["Microphone"]
    L --> M["Audio"]
    M --> N["Speaker"]
    N --> O["Audio"]
    O --> P["Speaker"]
    P --> Q["Audio"]
    Q --> R["Speaker"]
    R --> S["Audio"]

Front Panel LED Indicators

The LED indicators on both the front and rear of the unit provide basic information on the current status of the unit.

PWR Description
Solid green Unit is powered.
Off Unit is not powered.○

IN 1, IN 2, OUT Description
Solid green Identifies the currently selected port.
Off The port is not selected.

NOTE: When all LED indicators are flashing, this means that the unit is being reset to factory defaults. Refer to Performing a Factory Reset (page 12) for more information.

Standby Modes

The AT-GAIN-M50-LZ provides two standby modes: STNDBY and Network Standby. By default, the unit is shipped with STNDBY enabled, which complies with ENERGY STAR® and ErP regulations. To change the standby mode to Network Standby, execute the PWOFF command over RS-232. Refer to the AT-GAIN-M50-LZ API for a full list of commands.

Command Description
STNDBY	DEFAULT - Places the unit into low power mode. This low-power mode consumes 0.5 watts, which complies with ERP regulations. To turn the unit back on, press any button on the front panel or send PWON command using RS-232.
PWOFF	Places the unit into Network Standby mode. This low-power mode consumes 2.2 watts. To turn the unit back on, play audio through the system, press any button on the front panel, or send the PWON command using RS-232.
PWON	Turns the unit back on from either STNDBY or Network Standby mode.
PWCTRL on	DEFAULT - Enables either STNDBY or Network Standby mode, whichever was last activated.
PWCTRL off	Disables STNDBY and Network Standby, meaning the unit will never go into either low-power mode.
APwrOffTime	DEFAULT (15 minutes) – Sets the time of no activity needed to enter either STNDBY or Network Standby mode.

Amplifier Modes

Stereo Mode

In stereo mode, the output delivers 25 watts per left and right channel. Stereo sources will pass through to the amplifier, unchanged.

1. Locate the included 4-pin captive screw connector, for the OUTPUT port.
2. Connect the wires from the amplifier to the port as shown below.
3. Set the MODE switch to STEREO.

Bridged Mono Mode

In bridged mono mode, the output delivers 50 watts on a single channel. Stereo sources will be summed to mono at the amplifier.

1. Locate the included 4-pin captive screw connector, for the OUTPUT port.
2. Connect the wires from the amplifier to the port as shown below.
3. Set the MODE switch to MONO.

PA Sense

This section covers PA sense, which mutes the current audio program for the duration of a PA broadcast. The default setting of this port is Normally Open (NO). This can be changed to Normally Closed (NC) using the API.

1. Connect the PA SENSE port to the PA system and/or connect the TRIGGER port to the paging sensor.
2. The PA SENSE LED indicator will light up when PA Sense is active.
3. Adjust the PA SENSE potentiometer until the LED remains continuously on. Then, rotate the potentiometer until the LED turns off.
4. Test the PA system to verify PA Sense activation, and readjust the potentiometer if necessary.

IMPORTANT: The AT-GAIN-M50-LZ supports 25 V to 100 V systems. The wiring of the PA SENSE port must match the voltage rating of the system's amplifier.

Control

The CTRL / RS-232 port provides both volume control and external control. The top port is used to connect to the AT-GAIN-VOL (not included), and the bottom port is used to connect to a control system. Both ports can be used simultaneously.

Volume Control

1. Connect one of the 3-pin captive screw connectors to the top port, using the wiring as shown below.
2. Connect the opposite end to the 3-pin captive screw connector on the back of the AT-GAIN-VOL.

Connecting to a Control System

Before connecting to a control system, the AT-GAIN-M50-LZ may need to be configured over RS-232.

1. Connect an RS-232 cable, using a USB dongle, from the computer to the CTRL / RS-232 port on the AT-GAIN-M50-LZ.
2. Use a terminal client, such as Hercules, to establish a serial connection to the AT-GAIN-M50-LZ.
3. The default baud rate settings for the AT-GAIN-M50-LZ are: 115200, N, 8, 1. To change the baud rate settings, execute the Cspara command.

Example: Cspara[9600,8,0,1]

Refer to the AT-GAIN-M50-LZ API for a full list of commands.

1. Close the terminal session and disconnect the RS-232 cable between the computer and the AT-GAIN-M50-LZ.
2. Connect one of the included 3-pin captive screw connectors to the bottom port and wire the port as shown below.
3. Connect the opposite end to the control system.

Ducking

Overview

Audio ducking is a technique where the volume of one sound (usually background music) is automatically reduced when another sound (often a voice or main audio) is present. Ducking temporarily “ducks”, or lowers, the volume level of one audio signal anytime a second audio signal is present.

In Figure 1.1, two separate audio channels are shown: voice and background audio. The area highlighted in purple, between 00:00:15 and approximately 00:00:22, indicates the time at which the audio ducking takes place - that is, when the voice audio is present.

Figure 1.1 00:00:00 00:00:05 00:00:10 00:00:15 00:00:20 00:00:25 00:00:30

At 00:00:15, the background audio is automatically reduced to the level indicated by the shaded area in orange. This reduction in volume of the background audio is performed through a technique called sidechain compression, which uses the level of one audio channel to trigger a compressor in order to control the volume level of another audio channel.

Settings

The AT-GAIN-M50-LZ offers four values for adjusting ducking performance. The shaded area in orange, in Figure 1.1, will be examined to understand how these settings function.

Attack

The time, measured in milliseconds, required to reduce the audio track's volume to the designated ducking level (refer to Program Decrease on the next page).

Release

The time, in milliseconds, that it takes for the background audio to return to normal after the voice audio signal stops.

Program Decrease

The maximum volume reduction in decibels (dB) that occurs when ducking is triggered. This region lies between the attack and release phases.

Trigger

The audio trigger level, in decibels (dB). When this trigger level is exceeded, audio ducking is activated, reducing the background audio channel volume. Once the audio level falls below this threshold, the background audio channel returns to its normal volume.

The following presets are used by the AT-GAIN-M50-LZ. To adjust these values, changes must be made using the MIC command. Refer to the AT-GAIN-M50-LZ API document for more information.

Parameter Description Range
on	Enables microphone N/A
off	Disables microphone N/A
atime	Attack time (ms)	1...1000
rtime	Release time (ms)	1...3000
sens	Microphone sensitivity level (dB)	-60...0
reduce	Background noise reduction (dB)	-60...0

Setting Preset Value Range
Attack (ms)	100 ms 1...1000
Release (ms)	1000 ms + 300 ms ramp 1...3000
Program Decrease (dB)	-20 dB -60...0
Trigger (dB)	-30 dB -60...0

Performing a Factory Reset

1. Simultaneously press and hold both the PORT (1) and DUCKING (2) buttons for 10 seconds.

1. The LED indicators on the unit will flash to indicate the factory reset has occurred.
2. Release the PORT and DUCKING buttons when the LED indicators begin flashing.

Updating the Firmware

Requirements:

• AT-GAIN-M50-LZ
• Firmware file
  • Computer running Windows

• USB-C cable
  • USB Firmware Update Tool

• Download the firmware file from atlona.com and extract the contents of the .zip file to a folder on the computer desktop.

• Disconnect power from the unit.
• Connect the USB-C cable from the FW port on the AT-GAIN-M50-LZ to the computer. USB-C to USB-C or USB-A to USB-C cables can be used.
• While pressing and holding the PORT (1) button, reconnect power to the AT-GAIN-M50-LZ.

1. If a USB UPDATE folder is opened automatically, notate the drive letter and close the folder.
2. Launch the USB Update Tool.
3. The drive letter of the mounted drive for the unit will be displayed in the Disk Drive field. If it is not, click the Refresh button.

1. Click the Browse button and select the firmware file. Once the firmware file is selected, it will appear in the Firmware File field. If the firmware file is not displayed in this field, click the Refresh button.
2. Click the Update Firmware button.

1. The firmware update process will begin and will be monitored by a progress bar.

IMPORTANT: Do not disconnect power from the unit while performing the firmware update procedure.

1. After the update process has completed, the Copy process completed message will be displayed in the message window.

The PWR LED indicator, on the front panel, will flash green while the unit is being updated. Do not disconnect the USB cable during the update process. When the PWR LED stops flashing and is solid green, the update process will be complete.

Notes

Notes

Notes

Notes

Warranty

To view the product warranty, use the following link or QR code: https://atlona.com/warranty/.

English Declaration of Conformity

The English version can be found under the resources tab at: https://atlona.com/product/at-gain-m50-lz/.

Chinese Declaration of Conformity 中国RoHS合格声明

由SKU列出於:

https://atlona.com/about-us/china-rohs/.