KanexPro AP2DBL User manual

ap2dbl
Ap2dbl
Audio Amplifier with Mic
Mixer

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Table of Contents
1.!Introduction ...................................................................................................................................... 3!
2.!Features............................................................................................................................................. 3!
3.!Specification .....................................................................................................................................4!
4.!Audio Connection............................................................................................................................. 5!
5.!Buttons Control................................................................................................................................. 7!
6.!RS232 Communication Protocol:.....................................................................................................9!
7.!System Diagram ............................................................................................................................. 11!
8.!Panel Drawing ................................................................................................................................ 12!

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1. Introduction
The KanexPro Mini Audio Amplifier is a quarter-rack width digital amplifier (Class D) with equalizer control and Mic
mixer. It’s a simple yet powerful device delivering 2x20 Watts@4Ohm default output with built-in volume/ bass
feature. It also supports dual mono-output with 2 stereo audio selectable inputs. The Microphone mixer includes
independent volume control with balance switching. Supports balanced/ unbalanced signals.
This Mini Audio Amplifier is mainly used during lectures, house of worship centers and various musical events where
Mic mixing together with equalizing audio is critical.
2. Features
•Fast switching audio amplifier
•2x20 Watt@4Ohm as the default amplifier output
•Bridge connection supported by switching the amplifier to be 1x40Watt@8Ohm
•Supports Dual-mono output
•Built-in Microphone mixer (separately controllable)
•Line audio output, with volume controllable.
•MIC input supports 48V phantom power
•MIC port with balanced switching suppress
•Supports balanced/ unbalanced signals
•Supports Ducking power technology
•Ultra low inrush current
•Two stereo audio inputs, switchable by button, remote or RS232.
•Volume/Bass/Treble controllable by buttons or RS232
•Optional control by IR remote
•Convection cooled, antistatic case design
•LED indicator, for power and operating status
•IR remote (optional) not included
•Internal Universal power adaptable (100-240 volt AC, 50/60Hz)

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3. Specification
Audio Input
Audio Output
Input
2xstereo audio,
1xMIC
Output
1xamplifier,
1xstereo audio
Input
Connector
2xRCA
1x3.5mm jack
1xcaptive screw
connector,
Output
Connector
1xcaptivescrew
connector
1x3.5mm jack
Input
Impedance
>10KΩ
Output
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
2x20 Watts (4 Ohms)
Control Function
RS232
Control
RS-232, 9-pin
female D
connector
Pin
Configurations
2 = TX, 3 = RX, 5 = GND
IR Remote
Optional IR remote
TCP/IP
Control
TCP/IP controlled
NOTE: All nominal levels are at ±10%.

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4. Audio Connection
4.1 Audio Output
4.1.1 Default output: 2x20Watt@4Ohm
The default output of amplifier is 2x20Watt@4Ohm, so user can connect the amplifier output in the regular
way. As the picture below:
4.1.2 Bridge connection: 1x40Watt@8Ohm
The AP2DBL has the bridge connection, to double the output power at 1x40Watt@8Ohm. It will sum up the
input left channel and input right channel to be mono output, and the power is up to 40Watt.
The bridge connection is:
Switching to
the “STEREO”
Connecting the four pins, like this
Connecting the two pins, like this
Switching to
the “BRIDGE”

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4.1.3 Dual-mono output:
The AP2DBL 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 showing the same mono audio.
The connection is:
4.2 Microphone input
The microphone input of AP2DBL has three modes, and different modes use different connections, as the
picture below:
4.2.1 48V phantom power input
When the switch turns to “48V”, the MIC input will provide a 48V phantom power. This is usually used for
power supply for condenser microphone, Connection is:
“+” Connects to positive, “-” connects to negative and “╧” to ground.
NOTE: In this mode, only a condenser microphone can be connected to it.
Connecting the four pins, like this
Switching to
the “MONO”
Input
modes

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4.2.2 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:
a) “╧” connects to ground, and “-” connects to signal.
b) “╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧” connects to ground.
4.2.3 LINE input
When the switch turns to “LINE”, the microphone input is used for connecting with normal audio or wireless
microphone output. There are two different connections:
1) Unbalanced connection:
a) “╧”connects to ground, and “-” connects to signal.
b) “╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative and “╧” connects to ground.
5. Buttons Control
The buttons provides the control of volume/EQ control and switching.
5.1 Audio switching
There are two switchable stereo audio inputs, one 2xRCA input, and one 3.5mm jack input, switchable
through the buttons as below:
Source
Selection

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5.2 Volume/EQ controlling
The buttons can control the line volume and MIC volume.
The buttons, and controlled up/down/mute will select the MIC Volume/LINE bass/LINE treble 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 “ ”.
Firstly to select the function
from this menu.
Then to turn down/up the
level, or mute the output.

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6. RS232 Communication Protocol:
Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none
Command
Function Description
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: 04
Treble: 04

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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] arranges
from [00] to [60].
61 degrees in total.
Volume of LINE:
50
8[x][x]%
Preset the bass level, [xx] arranges
from [00] to [08].
9 degrees in total.
Bass of LINE: 04
9[x][x]%
Preset the treble level, [xx] arranges
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.
3: Any dot “.” after the letters is part of the 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 “21” degree. We should send the RS232 command: [521%]
Example 4:
Checking the working status of PA2B. We should send the RS232 command: [600%]

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7. Application Diagram

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8. Panel Drawing

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Warranty
A. Limited Warranty
KanexPro ™ warrants that (a) its products (the “Product”) will perform greatly in agreement with the accompanying
written materials for a period of 12 months (1 full year) from the date of receipt and (b) that the product will be free
from defects in materials and workmanship under normal use and service for a period of 1 year.!
B. CUSTOMER REMEDIES
KanexPro’s entire liability and Customer’s exclusive remedy shall be, at KanexPro option, either return of the price
paid for the product, or repair or replacement of the Product that does not meet this Limited Warranty and which is
returned to KanexPro with a copy of customers’ receipt. This Limited Warranty is void if failure of the Product has
resulted from accident, abuse, or misapplication. Any replacement Product will be warranted for the remainder of the
original warranty period of 1 year, whichever is longer.
C. NO OTHER WARRANTIES
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, KANEX DISCLAIMS ALL OTHER
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH REGARD
TO THE PRODUCT AND ANY RELATED WRITTEN MA- TERIALS. THIS LIMITED WARRANTY GIVES
CUSTOMERS SPECIFIC LEGAL RIGHTS. CUSTOMERS MAY HAVE OTHER RIGHTS DEPENDING ON THE
JURISDICTION.
!D. NO LIABILITY FOR DAMAGES
!TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL KANEX BE
LIABLE FOR ANY DAMAGES WHATSOEVER (INCLUDING WITHOUT LIMITATION, SPECIAL,
INCIDENTAL, CONSEQUENTIAL, OR INDIRECT DAMAGES FOR PERSONAL INJURY, LOSS OF
BUSINESS PROFITS, BUSINESS INTERRRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER
PECUNIARY LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE THIS PRODUCT, EVEN IF
KANEX HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Brea, California
KanexPro.com
MPN: AP2DBL
HDMI are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries. Kanex is a trademark of Apogee Inc., registered in the

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U.S.