BZB Gear BG-AMP2X20 User manual

BG-AMP2X20
40 Watt Compact Stereo/Mono 2-Channel Audio Amplifier
with 3 Inputs
User Manual

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 2

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
TABLE OF CONTENTS
Statement 4
Safety Precaution 4
Introduction 5
Features 5
Packing List 5
Technical Specifications 6
Operation Controls and Functions 7
Operation of the Control Panel and the IR Remote 11
Communication Protocol and Command Codes 13
Troubleshooting & Maintenance 14
Application Example 15
Tech Support 16
Warranty 16
Mission Statement 16
Copyright 16
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 3

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Statement
Please read these instructions carefully before connecting, operating, or configuring this
product. Please save this manual for future reference.
Safety Precaution
●To prevent damaging this product, avoid heavy pressure, strong vibration, or immersion
during transportation, storage, and installation.
●The housing of this product is made of organic materials. Do not expose to any liquid,
gas, or solids which may corrode the shell.
●Do not expose the product to rain or moisture.
●Unplug this device during lightning storms
●Clean only with a soft dry microfiber cloth.
●To prevent the risk of electric shock, do not open the case. Installation and maintenance
should only be carried out by qualified technicians.
●Do not use the product beyond the specified temperature, humidity, or power supply
specifications.
●This product does not contain parts that can be maintained or repaired by users.
Damage caused by dismantling the product without authorization from BZBGEAR is not
covered under the warranty policy.
●Installation and use of this product must strictly comply with local electrical safety
standards.
●Only use accessories specified by the manufacture
●Product specifications may be subject to technical upgrades without further notice
●Do not twist or pull by force ends of the optical cable. It can cause malfunction.
●Do not hot plug when it is working.
●Information on disposal for scrapped devices: do not burn or mix with general
household waste, please treat them as normal electrical wastes.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 4

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Introduction
The BG-AMP2X20 is a compact-size digital amplifier (Class-D) with 3 inputs (2 line in and 1
balanced MIC). It has integrated functions including bridge connection, dual-mono, EQ
control, microphone mixer etc.
It has a good application in different places, including classroom, small meeting room,
lecture hall, bar, pub etc.
Features
●Default amplifier output: 2x20 Watt @4Ohm.
●Bridge connection function: Users can switch to a 1x40Watt@8Ohm bridge
connection.
●Two stereo audio inputs, switchable by button, IR remote, & RS232.
●Volume/Bass/Treble controllable by buttons, IR remote, & RS232.
●The MIC port can support balanced/unbalanced signals and suppress external
noise.
●Line audio output at 3.5mm jack, with volume controllable.
●Dual-mono function: Uses can sum up the stereo audio to two times mono audio.
●MIC mixer function: The microphone will be mixed to the line audio output and
controlled separately.
●MIC input supports 48V phantom power, dynamic MIC and wireless MIC.
●Auto noise gate will keep detecting the audio and MIC input and will mute the output
when there is no input.
●Ultra low inrush current, no need for power sequencing. This allows multiple units to
be powered on simultaneously without overloading power circuits.
●Convection cooler, fan is not needed.
●Antistatic case design: providing good protection for long-term and stable
performance.
Packing List
●1x Mini Digital Amplifier
●2x Pluggable Terminal Blocks
●1x RS232 Cable
●1x Power Adapter
●1x Power Cord
●4x Plastic Cushions
●1x User Manual
●1х Quick Start Guide
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 5

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Technical Specifications
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 pluggable terminal block (3P,
3.81mm)
Output
Connector
1 3.5mm jack
1 pluggable terminal block (4P,
5.08mm)
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
3-hole phoenix connector
Panel Control
Optional button control
IR Remote
Optional IR remote
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 6

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Operation Controls and Functions
Front Panel
1. Mic: Balanced Mic In.
2. 48V/Mic/Line: Input mode 48V/Mic/Line.
3. Stereo/Mono/Bridge: Output mode Stereo/Mono/Bridge.
4. IR: IR Receiver.
5. RS232: 3-pin phoenix connector
6. Input 1 L/R: L/R Audio RCA Line In 1.
7. Input 2 L/R: L/R Audio 3.5mm Line In 2.
Rear Panel
8. Power LED: Illuminates when power is connected
9. Power DC 24V: Connect to the provided power adapter.
10. Loop Out: Line audio output at 3.5mm jack, with volume controllable.
11. Out: 2x20 Watt @ 4 Ohm / 1x40 Watt @ 8 Ohm Out.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 7

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Panel Drawing
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 8

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Audio Output
●Default output: 2x20Watt@4 Ohm
The default output of the amplifier is 2x20 Watt@4 Ohm, as shown in the picture below:
Connect the four output pins as shown above:
●Bridge connection: 1x40 Watt@8 Ohm
The BG-AMP2X20 has the ability to create a bridge connection which doubles the output
power at 1x40 Watt@8 Ohm. It will sum up the left and right input channels to be a mono
signal with a power output of 40 Watts.
Connect two of the output pins as shown above:
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 9

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
●Dual-mono Output
The BG-AMP2X20 can also function in a double-mono output mode. It can sum up the left
and right channels, to be a mono audio output. In this configuration both of the outputs are
outputting the same mono audio signal.
Connecting the four output pins as shown above:
Microphone input
The microphone input of BG-AM2X20 has three modes and each different mode uses a
different connections, as shown in the picture below:
●48V phantom power input
When the switch is set to “48V”, the MIC input will provide a 48V phantom power. This is
usually used as a power supply for condenser microphones. The connection is: “+”
connects to positive, “-” connects to negative, and “╧” to ground.
Note: In this mode, only a condenser style microphone can be connected.
●MIC input
When the switch is set to “MIC”, the microphone input is used for connecting a dynamic
microphone. There are two different connection methods:
1) Unbalanced connection:
“╧” connects to ground, and “-” connects to signal.
“╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative, and “╧”
connects to ground.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 10

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
●LINE input
When the switch is set to “LINE”, the microphone input is used to connect a normal audio
or wireless microphone output. There are two different connection methods:
1) Unbalanced connection:
“╧” connects to ground, and “-” connects to signal.
“╧” connects to ground, and “+” connects to signal.
2) Balanced connection: “+” connects to positive, “-” connects to negative, and “╧”
connects to ground.
Operation of the Control Panel and the IR Remote
Operation of the Control Panel
The buttons provide the control of volume/EQ control and switching. The following content
introduces audio switching and EQ control in detail.
●Audio switching
There are two switchable stereo audio inputs, one L/R RCA and one 3.5mm stereo mini jack
input, switchable through the buttons as shown below:
●Volume/EQ controlling
The line volume and MIC volume can be controlled by the buttons. The MIC Volume/LINE
volume/LINE bass/LINE treble is selected by pressing the button. Volume is controlled by
pressing the up/down/mute function buttons.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 11

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Usage of the IR Remote
Notice: The IR remote, the IR receiver, and the battery of the IR remote are all offered for
charge.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 12

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Communication Protocol and Command Codes
Communication Protocol: 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
1A0.
Mute audio of MIC
Mute MIC
2A0.
Mute audio of line out
Mute LIN
0A1.
Unmute Audio
Unmute
3A0.
Switch on Noise Gate
Gate On
4A0.
Switch off Noise Gate
Gate Off
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
Init OK
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 changeable.
2. The bracket [ ] is not included in the RS232 commands.
3. Any dot “.” after the letters is part of the commands.
Example 1:
Switching input 2 to the line out, RS232 command is: [2A1.]
Example 2:
Turning up the volume of line audio, RS232 command is: [603%]
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 13

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Troubleshooting & Maintenance
1) There is no audio output:
a) Check if there is any signal at the input.
b) Check if there is any signal at the output.
c) Check these by using an oscilloscope or a multimeter. If there is no
input/output signal check if the input/output cables are broken or the
connectors are loose.
d) Check if the output port number is the same with the one selected.
2) There is no power.
a) Check to ensure that the power adapter is properly connected to the unit and
to a power source.
3) Sound is distorted.
a) Ensure that the system is properly grounded.
4) Static becomes stronger when connecting the audio connectors.
a) Check for a bad ground/loose connection.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 14

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Application Example
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 15

BZBGEAR BG-AMP2X20 PRODUCT MANUAL
Tech Support
Have technical questions? We may have answered them already!
Please visit BZBGEAR’s support page (bzbgear.com/support) for helpful information and
tips regarding our products. Here you will find our Knowledge Base
(bzbgear.com/knowledge-base) with detailed tutorials, quick start guides, and step-by-step
troubleshooting instructions. Or explore our YouTube channel, BZB TV
(youtube.com/c/BZBTVchannel), for help setting up, configuring, and other helpful how-to
videos about our gear.
Need more in-depth support? Connect with one of our technical specialists directly:
Phone
1.888.499.9906
Email
[e-mail]
Live Chat
bzbgear.com
Warranty
BZBGEAR Pro AV products and cameras come with a three-year warranty. An extended
two-year warranty is available for our cameras upon registration for a total of five years.
For complete warranty information, please visit bzbgear.com/warranty.
For questions, please call 1.888.499.9906 or email [e-mail].
Mission Statement
BZBGEAR is a breakthrough manufacturer of high-quality, innovative audiovisual equipment
ranging from AVoIP, professional broadcasting, conferencing, home theater, to live
streaming solutions. We pride ourselves on unparalleled customer support and services.
Our team offers system design consultation, and highly reviewed technical support for all
the products in our catalog. BZBGEAR delivers quality products designed with users in
mind.
Copyright
All the contents in this manual and its copyright are owned by BZBGEAR. No one is allowed
to imitate, copy, or translate this manual without BZBGEAR’s permission. This manual
contains no guarantee, standpoint expression or other implies in any form. Product
specification and information in this manual is for reference only and subject to change
without notice.
All rights reserved. No reproducing is allowed without acknowledgement.
Address: 830 National Drive #140, Sacramento, CA 95834, USA ·Tel: [phone] ·Email: [e-mail] 16