Comm-Tec MMA220B Operation & User’s Manual

1, Mini Digital Amplifier, with MIC Mixer and EQ 1 MMA220B Mini Digital Amplifier, with EQ/Mixer Index: 1. General Instruction ................................................................ 2 2. Product Picture...........…

2, Mini Digital Amplifier, with MIC Mixer and EQ 2 1. General Instruction MMA220B is a small digital amplifier (Class-D), with EQ control and MIC mixer function. It is compact-size but powerful functions, including the bridge connection, dual-…

3, Mini Digital Amplifier, with MIC Mixer and EQ 3 3. Features  2x20Watt@4Ohm as the default amplifier output.  Bridge connection function. The user can switch the MMA220B to be 1x40Watt@8Ohm by bridge connection.  Dual-mon…

4, Mini Digital Amplifier, with MIC Mixer and EQ 4 4. Specification Audio Input Audio Output Input 2 stereo audio, 1 MIC Output 1 amplifier, 1 stereo audio Input Connector 2 RCA 1 3.5mm jack 1 captive screw connector, Outpu…

5, Comm-Tec MMA220B Mini Digital Amplifier, with MIC Mixer and EQ 5 5. Audio Connection 5.1 Audio Output 5.1.1 Default output: 2x20Watt@4Ohm The default output of amplifier is 2x20Watt@4Ohm. So, the user can connect the amplifier output in the regular…

6, Mini Digital Amplifier, with MIC Mixer and EQ 6 5.1.3 Dual-mono output: The MMA220B also has the function of double-mono output. It can sum up the left and right channel, to be the mono audio output. In this way, the both of the outputs are sh…

7, Comm-Tec MMA220B Mini Digital Amplifier, with MIC Mixer and EQ 7 5.2.2 MIC input When the switch turns to “MIC”, the microphone input is used for connecting with dynamic microphone. There are two different connections: 1) Unbalanced connection: …

8, Comm-Tec MMA220B Mini Digital Amplifier, with MIC Mixer and EQ 8 6. Buttons Controlling The buttons provides the control of volume/EQ control and switching. 6.1 Audio switching There are two switchable stereo audio inputs, one 2xRCA input, and one 3…

9, Mini Digital Amplifier, with MIC Mixer and EQ 9 6.2 Volume/EQ controlling The line volume and Microphone volume can be controlled by the buttons. The MIC Volume/LINE volume/LINE bass/LINE treble will be selected by the buttons, and controlled up/down/m…

10, Mini Digital Amplifier, with MIC Mixer and EQ 10 7. RS232 Communication Protocol: Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none Command Function Description Feedback Code 1A1. Switching the audio t…

11, Comm-Tec MMA220B Mini Digital Amplifier, with MIC Mixer and EQ 11 Command Function Description Feedback Code 5[x][x]% Preset MIC volume, [xx] arranges from [00] to [60]. 61 degrees in total. Volume of MIC: 50 7[x][x]% Preset line volume, [xx] arr…

12, Comm-Tec MMA220B Mini Digital Amplifier, with MIC Mixer and EQ 12 8. System Diagram 2x20Watt@4Ohm Looping connection 1x40Watt@8Ohm …