OWI AMP-MA40 User manual

Mini Digital Amplifier, with MIC Mixer and EQ
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AMP-MA40
40 Watt Mini Digital Amplifier, with Mic Mixer/EQ
17141 Kingsview Ave. Carson CA 90746-1207 USA
Tel. [phone] * Fax [phone]
[email protected]
www.owi-inc.com
Technical Support: 310-515-1900
Index:
1.Introduction:...........................................................................................................2
2.Product Picture.......................................................................................................2
3.Features ..................................................................................................................3
4.Specification...........................................................................................................4
5.Audio Connections.................................................................................................5
6.Buttons Controlling................................................................................................6
7.RS232 Communication Protocol ...........................................................................8
8.System Diagram...................................................................................................10
9.Panel Drawing......................................................................................................11
10. IR Control Package (Optional - Sold separately).................................................12
11. Warranty................................................................................................................14
USER MANUAL

Mini Digital Amplifier, with MIC Mixer and EQ
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1. Introduction
AMP-MA40 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-mono, EQ control, microphone mixer etc.
Applications include classrooms, small meeting rooms, lecture halls, bars, etc.
2. Product Picture
Front Panel
Rear Panel
Top Panel

Mini Digital Amplifier, with MIC Mixer and EQ
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3. Features
z2x20Watt@4Ωas the default amplifier output.
zBridge connection function. The user can switch the AMP-MA40 to be 1x40Watt@8Ωby
bridge connection.
zDual-mono function. The user can sum up the stereo audio to two times mono audio.
zMicrophone mixer function. The microphone will be mixed to the line audio
output, and separately controllable.
zMono Mic input and unbalanced tip ring sleve.
zDucking power technology. It keeps detecting the audio and MIC input, and
reducing the power consumption when there is no input coming.
zTwo stereo audio inputs, switchable by button, remote or RS232.
zVolume/Bass/Treble controllable by buttons or RS232
zLine audio output with volume control.
zOptional control solution by IR remote.
zRS232 controlling function, with smart feedback.
zExtensibility: It can be controlled by a wall control panel (optional accessory).
zAntistatic case design: providing good protection for long-term and stable performance
zInternational power supply (100Volt~240Volt AC, 50/60Hz) For worldwide
compatibility.
zFast switching speed. It is the high speed for the good performance.
zLED indicator, for power and working status.

Mini Digital Amplifier, with MIC Mixer and EQ
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4. Specifications
Audio Input Audio Output
Input 2 ea. stereo audio,
1 ea. Mono MIC Output 1 ea. Amplifier, 1 ea. stereo audio
Input Connector
2 ea. RCA
1 ea. 3.5mm jack
1 ea. 6.5mm (1/4”) phono
jack
Output Connector
1 ea. 3.5mm jack
1 ea. Captive screw connector, 4
poles
Input Impedance >10KΩOutput Impedance 50Ω/stereo, 4~8Ω/Amplifier
Audio General
Frequency
Response 20Hz ~ 20KHz CMRR >70dB@20Hz~20KHz
SNR 80dB at maximum output Bandwidth 20Hz ~ 25KHz
Stereo Channel
Separation >75dB@20Hz to 20KHz THD + Noise 1%@1KHz, 0.3%@20KHz at
nominal level
Voltage Gain 32dB Power Output 20 Watts X 2 (4Ω)
Control Parts
Serial Control Port RS-232, 9-pin female D
connector Pin Configurations 2 = TX, 3 = RX, 5 = GND
IR Remote Optional IR remote Front Panel Control Optional mountable keypad
NOTE: All nominal levels are at ±10%.

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5. Audio Connections
5.1 Default output: 2x20Watt@4Ω
The default output of amplifier is 2x20Watt@4Ω. So, the user can connect the amplifier
output in the regular way. As the picture below:
5.2 Bridge connection: 1x40Watt@8Ω
The AMP-MA40 has the bridge connection, to double the output power at
1x40Watt@8Ω. It will sum up the input left channel and input right channel to be mono
output, and the power is up to 40Watts.
The bridge connection is:
1x40Watt@8Ω
2x20Watt@4Ω
Switching to the
“STEREO”
Switching to the
“BRIDGE”
Connecting the two pins, like this
Connecting the four pins, like this

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5.3 Dual-mono output: 2x20Watt@4Ω
The AMP-MA40 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, both of the outputs are
showing the same mono audio.
The connection is:
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, one 3.5mm jack input.
It can be switched through the buttons as below:
Source
Selection
Switching to the
“MONO”
Connecting the four pins, like this

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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/mute by the function buttons. Please check the picture below:
For example, to turn up the line volume, you should select the “LINE” first, and then
press the button “ ”.
Select the function from this
menu in advance
Turn up/down the level.
Or mute the line volume

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7. RS232 Communication Protocol
Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none
Command Function Desctription Feedback Code
1A1. Switching the audio to input 1 A: 1 -> 1
2A1. Switching the audio to input 2 A: 2 -> 1
0A0. Mute Audio of MIC and Line out Mute Audio
1A0. Mute audio of MIC Mute MIC
2A0. Mute audio of line out Mute LIN
0A1. UnMute Audio UnMute Audio
600% Checking the working status A: 1 -> 1
Volume :30
Bass 00
Treble 00
601% MIC volume up Volume of MIC : 51
602% MIC volume down Volume of MIC : 51
603% Line volume up Volume of LINE : 51
604% Line volume down Volume of LINE : 51
605% Bass level up Bass of LINE ：04
606% Bass level down Bass of LINE ：04
607% Treble level up Treble of LINE : 04
608% Treble level down Treble of LINE : 04
609% Initialization, back to the default setting
A: 1 -> 1
Volume :50
Bass 07
Treble 07

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Command Function Desctription Feedback Code
5[x][x]% Preset MIC volume, [xx] is aranging from [00]
to [60].
61 degrees in total.
Volume of MIC :50
7[x][x]% Preset line volume, [xx] is aranging from [00] to
[60].
61 degrees in total.
Volume of LINE :50
8[x][x]% Preset the bass level, [xx] is aranging from [00]
to [08].
9 degrees in total.
Bass of LINE : 04
9[x][x]% Preset the treble level, [xx] is aranging from
[00] to [08].
9 degrees in total.
Treble of LINE : 04
Notice:
1: The letter inside bracket [ ] is the variable code, which is the changeable.
2: The bracket [ ] is not included to the RS232 commands.
Example 1
Switching the input 2 to the line out. We should send the RS232 command: [2A1.]
Example 2
Turning up the volume of line audio. We should send the RS232 command: [603%]
Example 3
Preset the MIC volume to be “21” degree. We should send the RS232 command:
[521%]
Example 4
Checking the working status of AMP-MA40. We should send the RS232 command:
[600%]

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8. System Diagram
2x20Watt@4Ω
Looping connection
1x40Watt@8Ω