
AFM-20DSP-AEC Quick Start 
AFM-20DSP-AEC Quick Start Guide 
This guide helps you install and use your AFM-20DSP-AEC for the first time.  
Go to www.kramerav.com/downloads/AFM-20DSP-AEC to download the latest user manual and check if 
firmware upgrades are available. 
Step 1: Check what’s in the box 
AFM-20DSP-AEC 20 Port Audio Matrix 
Step 2: Get to know your AFM-20DSP-AEC
Indicates the system’s status: 
• 3 cycles of red/blue/off/green LEDs 
that flash in sequence for 30 seconds 
when the system starts up, and the 
application has not been launched. 
• Flashes green when the application starts. 
• Stays green when system is ready for use. 
Indicate the port’s status: 
• Green when an input signal is 
detected, and the port is defined as 
line in. 
• White when defined as line out. 
• Blue when defined as mic in. 
• Red when in clipping state. 
• Yellow when in limiting state. 
• Off when there is no signal on the input. 
IN OUT Dante™ LEDs  
(1 to 4) 
Indicate the Dante’s signal status: 
• Green when a signal is detected. 
• Red when clipping occurs. 
• Yellow when in limiting state. 
• Off when no signal is detected. 
Turns green when an analog audio signal is associated with the HDMI OUT signal. 
Otherwise, it stays OFF. 
Turns green when the HDMI IN audio signal is detected. Otherwise, it stays OFF. 
IN OUT USB or S/PDIF LEDs 
Indicate the USB or S/PDIF’s status: 
• Green when a signal is detected. 
• Off when no signal is detected. 
 If a signal is detected on one channel, either left only or right only, the status LED is 
green. 
CH 1(L)/CH 2(R) AMPLIFIER 
LEDs 
Indicate the amplifier’s signal status: 
• Green when a signal is detected. 
• Off when no signal is detected. 
 On the web page, CH1 and CH2 are referred to as AMP 1 and AMP 2, respectively. 

PORTS 3-pin Terminal Block 
Connectors (1 to 20) 
Interchangeable balanced mono-audio ports. Connect to an audio source or acceptor in 1 
of 8 selectable I/O configurations: 16x4, 14x6, 12x8, 12x8 AEC ,10x10, 8x12, 6x14, 4x16.  
Define each port as line in, mic in, mic + 48V in, or line out. 
AFM-20DSP-AEC can process the USB audio as a stereo speaker or operate as an audio 
line-in or microphone for an audio recorder application or call conferencing. 
When the AFM-20DSP-AEC is connected to a computer via USB-B: 
• In the computer’s Settings > Manage sound devices > Output devices, the AFM-
20DSP-AEC USB shows as “Speaker USB AUDIO CODEC”. 
• In a computer recoding application, the audio input settings for AFM-20DSP-AEC 
show as “Line USB AUDIO CODEC”. 
 Important: 
• The computer’s “Output” device (such as speakers) shows in the AFM-20DSP-AEC 
embedded web pages as a USB Digital “Input”. 
• The computer’s “Input” device (such as a microphone) shows in the AFM-20DSP-
AEC embedded web pages as a USB Digital “Output”. 
Connect to an HDMI acceptor to embed an audio signal from the matrix. 
Connect to an HDMI source to de-embed the audio signal (the video signal is passed 
through to the output). 
Connect to a digital stereo audio acceptor. 
Connect to a digital stereo audio source. 
Outputs two selected audio signals in two channels. 
• For Lo-Z: connect stereo output to Lo-Z speakers: L+ and L- to the left speaker; 
R+R- to the right speaker. 
• For Hi-Z (70V or 100V): connect Hi-Z and COM to mono Hi-Z speakers. 
Connect to Dante audio through the network. Provides 4 Tx channels and 4 Rx channels.  
By default, DHCP is enabled. 
RS-232 3-pin Terminal Block 
Connector 
Connect to a PC/serial controller to control the device.  
16 
Connect to a PC via a LAN to control the device and for firmware upgrades. 
Connect to your PC to control the device. 
Press and hold for 5 seconds, to reset the configuration to its default parameters. 
Mains Power Connector and 
Fuse 
Plug in for the power cord. 
POWER Illuminated Power 
Switch 
Turns the device on and off. 

Step 3: Mount AFM-20DSP-AEC 
To rack mount the machine, attach both rack ears 
(remove the screws from each side of the machine 
and replace screws through the rack ears) or place 
the machine on a table. 
• Ensure that the environment (e.g., maximum ambient temperature & 
air flow) is compatible for the device. 
• Avoid uneven mechanical loading. 
• Appropriate consideration of equipment nameplate ratings should be 
used for avoiding overloading of the circuits. 
• Reliable earthing of rack-mounted equipment should be maintained. 
Step 4: Connect inputs and outputs 
Always turn off the power on each device before it is connected to the AFM-20DSP-AEC device. 
For optimum range and performance, use the recommended Kramer cables available at 
www.kramerav.com/product/AFM-20DSP-AEC. The use of third-party cables may cause damage! 

Step 5: Connect the power 
Connect the power cord to AFM-20DSP-AEC and plug it into the mains electricity. 
Safety Instructions (See www.kramerav.com for updated safety information) 
Caution: 
• There are no operator serviceable parts inside the unit. 
Warning: 
• Use only the power cord that is supplied with the unit. 
• Disconnect the power and unplug the unit from the wall before installing. 
• Do not open the unit. High voltages can cause electrical shock! Servicing by qualified personnel only. 
• To ensure continuous risk protection, replace fuses only according to the rating specified on the product label which located on the bottom of the unit. 
Step 6: Operate AFM-20DSP-AEC 
To operate AFM-20DSP-AEC, use: 
• Embedded web pages via the 
Ethernet. 
• RS-232 serial commands 
transmitted by a touch screen 
system, PC, or other serial 
controller. 
RS-232 Control / Protocol 3000 
Example: (adjust the amplified audio from analog audio 1 to -10dB):  
#x-aud-lvl out.amplified_audio.1.audio.1,-10 
Default Ethernet Parameters 
Press and hold for 5 seconds to reset the configuration to its 
default parameters. 
In the Settings page, click Factory Reset.