MIXHITS AUDIO MRT-B120D User manual

MRT-B120D MIXER AMPLIFIER
OPERATION MANUAL
Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
ON
OFF
POWER
MIC1 INPUT
MRT-120D
PROT
AUX 2MIC 3
MIC 1 MIC 2 MASTER
100V
SIG
CLIP
TREBLEBASS
10 0 10 0 10 0 10 0 10 0 10 0 4-16Ω
MIC /4 AUX 1
AUDIO

TABLE OF CONTENTS
2
1. SAFETY PRECAUTIONS .......................................................................................3
2. GENERAL DESCRIPTION ....................................................................................5
3. FEATURES ...............................................................................................................5
4. FUNCTIONS
4.1 Front Panel ..............................................................................................................6
4.2 Rear Panel............................................................................................................... 7
5. OPERATION ILLUSTRATION ................................................................................8
6. .............................................................................................9
7. APPLICATIONS ..................................................................................................... 10
8.BLOCK DIAGRAM .................................................................................................11
9.SPECIFICATIONS ................................................................................................. 12
10.DIMENSIONAL DIAGRAM ................................................................................. 14
TROUBLESHOOTING

Be sure to read the instructions in this section carefully before use.
Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
We also recommend you keep this instruction manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
When Installing the Unit
• Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
• Use the unit only with the voltage specified on
the unit. Using a voltage higher than that which is
specified may result in fire or electric shock.
• Do not cut, kink, otherwise damage nor modify
the power supply cord. In addition, avoid using
the power cord in close proximity to heaters, and
never place heavy objects including the unit itself
on the power cord, as doing so may result in fire
or electric shock.
• Be sure to replace the unit's terminal cover after
connection completion. Because high voltage is
applied to the speaker terminals, never touch
these terminals to avoid electric shock.
• Be sure to ground the safety ground (earth)
terminal to avoid electric shock. Never ground to a
gas pipe as a catastrophic disaster may result.
• Avoid installing or mounting the unit in unstable
locations, such as on a shaky table or a slanted
surface. Doing so may result in the unit falling
down, causing personal injury and/or property
damage.
When the Unit is in Use
Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your Mixhits Audio dealer. Do not attempt to
operate the unit in this condition as this may cause
fire or electric shock.
• If you detect smoke or an odor from the unit.
• If water or any metallic object gets into the unit
• If the unit falls, or the unit case breaks
• If the power supply cord is damaged.
• If it is malfunctioning (no sound.)
• To prevent a fire or electric shock, never open or
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
your Mixhits Audio dealer.
• Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.
• Do not insert or drop metallic objects or flammable
materials in the ventilation slots of the unit's cover,
as this may result in fire or electric shock.
1. SAFETY PRECAUTIONS
3

An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in
the electrical installation of the building.
When Installing the Unit
•Never plug in nor remove the power supply
plug with wet hands, as doing so may cause
electric shock.
•When unplugging the power supply cord, be sure
to grasp the power supply plug. Never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric
shock.
•When moving the unit, be sure to remove its
power supply cord from the wall outlet. Moving the
unit with the power cord connected to the outlet
may cause damage to the power cord, resulting in
fire or electric shock. When removing the power
cord, be sure to hold its plug to pull.
•Do not block the ventilation slots in the unit's
cover. Doing so may cause heat to build up inside
the unit and result in fire.
• Avoid installing the unit in humid or dusty
locations, in locations exposed to the direct
sunlight, near the heaters, or in locations
generating sooty smoke or steam as doing
otherwise may result in fire or electric shock.
When the Unit is in Use
•Do not place heavy objects on the unit as this
may cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
•Make sure that the volume control is set to the
minimum position before the power is switched on.
Loud noise produced at high volume when power is
switched on can damage hearing.
•Do not operate the unit for an extended period of time
with the sound distorting. This is an indication of a
malfunction, which in turn can cause heat to generate
and result in a fire.
•If dust is allowed to accumulate in the unit over a
long period of time, a fire or damage to the unit
may result. Contact your Mixhits Audio dealer to
schedule a cleaning of the unit.
•If dust accumulates on the power supply plug or
in the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
•Switch off the power, and unplug the power
supply plug from the AC outlet for safety
purposes when cleaning or leaving the unit
unused for several days. Doing otherwise may
cause a fire or electric shock.
4
SAFETY PRECAUTIONS

This product is a mixer amplifier adopting a combination of high-performance switching power supply and
digital power amplifier, with 1U chassis design, high efficiency,light weight & delicate appearance.
2. GENERAL DESCRIPTION
1.
higher efficiency, light weight and delicate appearance.
Mixer/amp has a 1U design, internal combination of switching power supply and digital power amplifier
,
2. Supports 1 channel EMC input, 2 channels AUX input, 4 channels MIC input.
3. Each input has independent gain adjustment and overall treble, bass, and master volume control.
4. The mixer/amp is equipped with level indication, overload and protection indicator, and provides protection
for short circuits, overload and overheat situations.
5. The microphone inputs provide priority over the AUX inputs, EMC takes precedence over all audio inputs.
6. Channel priority function: EMC>MIC1>MIC2/MIC3/MIC4/AUX1/AUX2/MP3.
7. Adopt advanced and high-efficiency power amplify circuit, the speaker output is 70V or 4 ohms;
rated output power is 120W.
8. Air-cooled with a variable speed fan from front to the rear, fan rotates at a constant speed when starting up.
5
3. FEATURES

ON
OFF
POWER
MIC1 INPUT
PROT
MIC /4 AUX 1 AUX 2MIC 3
MIC 1 MIC 2 MASTER
70V
SIG
CLIP
TREBLEBASS
10 0 10 0 10 0 10 0 10 0 10 0 4-16Ω
4. FUNCTIONS
6
4.1 FRONT PANEL
11 121 2 345678 9 10
1. MIC1 unbalanced input jack
2. MIC1 volume control knob
3. MIC2 volume control knob
4. MIC3 volume control knob
5. MIC4 / AUX1 volume control knob
6. AUX2 volume control knob
7. BASS adjustment potentiometer
8. TREBLE adjustment potentiometer
9. Master volume control
10. PROT/70V/4-16 OHM / CLIP / SIGNAL STATUS
11. Power switch
12. Power indicator

7
4. NOMENCLATURE AND FUNCTIONS
4.2 REAR PANEL
4-16Ω100V
MUTE
AUDIO AUX2 AUX1
OUTPUT INPUT
MIC LINE PHANTOM MIC LINE PHANTOM MIC LINE PHANTOM MIC LINE PHANTOM
MIC 4 MIC 3 MIC 2
EMC IN MUTE
G G G
G
+
MIC 1
NC
G
OUTPUT
100V/4-16Ω
NC NC
1235 7
415
68 9 1011 1213 14 16
17
18
1.
2.
3. 70V / 4-16Ω speaker output switch
4. Cooling fan
5. Line output interface
6. 2 channel AUX input interface,
7. Line input /Mic input /Phantom power switch for MIC4
8. MIC4/AUX1 Balance input
9. Line input /Mic input /Phantom power switch for MIC3
10. MIC3 Balance input
11. Line input /Mic input /Phantom power switch for MIC2
12. MIC2 Balance input
13. MUTE control switch
14. Line input /Mic input /Phantom power switch for MIC1
15. EMC input interface
16. MUTE signal input port
17. Not used
18. MIC1 Balance input
AC power input socket
70V/4-16Ω output interface

8
5. OPERATION ILLUSTRATION
1.Connect the speakers:
Constant voltage speaker not to exceed 120 Watts
total wattage of all speakers combined.
selector switch
is in the 70V position, as shown below:
①When the 70V / 4-16Ω ②
is in the
When the 7 0V and 4-16Ω selector switch
4-16Ω position, as shown below:
Fixed resistance speaker: 4-16Ω
Note:
1. Before connecting the speakers, please make sure that the equipment is powered off to avoid the
risk of electric shock.
2. During the installation of speakers, please make sure that the sum of the rated input power of the
speakers to be connected is less than 120 watts.
2.Connect external devices
①Please ensure that the equipment and all equipment will be connected is powered off.
②Using the corresponding cable to connect this equipment and other external equipment.
:
3.Connect the power line and turn it on:
· Please make sure that the power switch of the Mixer/Amp and its connected equipment are
turned off.
· Turn the volume knob to the left.
· Connect the supplied power line to the AC IN interface
· Plug the power line into the AC socket.
· Turn on the connected equipment (music source, etc.), and then turn on the Mixer/Amp.
Note:
1.Before powering on, please check and make sure there is no problem with the cable and connection.
2.When you turn off the system, turn off the Mixer/Amp, and then turn off the connected equipment.
4-16Ω100V
OUTPUT
100V/4-16Ω
NC NC
SPK- SPK+
4-16Ω100V
OUTPUT
100V/4-16Ω
NC NC
SPK- SPK+

9
5. OPERATION INSTRUCTIONS
Note:
1.After turning off the power switch please wait about 5 seconds before turning on it again. Continuous rapid
turning on and off the power switch will lead to equipment failure.
2.While the Mixer/Amp is in the off position it will continue to draw a small amount of current. If the Mixer/Amp will
not be used for an extended period it is recommended to disconnect the main AC power.
4.
1.Turn the volume knob to the left then connect the microphone.
2.Slowly turn the volume knob to the right increasing the gain.
3.While speaking into the microphone continue to increase the gain until the desired level is obtained.
Microphone use:
5.Shutdown the Mixer/Amplifer:
1.Turn the volume knob to the left until the minimum position is reached.
2.Turn off the power switch of the Mixer / Amplifier prior to turning off the input sources.
6. TROUBLESHOOTING
Symptom Cause
1. Power switch is not opened
1Power line is cut off
2. The protection function of the equipment is
not activated
.
2. All lines are connected, but there is
no sound.
1. The power switch is not on or the power plug is not
connected to a live AC outlet.
2. The fuse has failed
3. The volume knob is in the off position or set to low.
4. There is no audio signal input
5. There is short-circuit in the speaker line.
3. The sound suddenly disappears in
normal status.
1. The Mixer/Amp has reached a very high
temperature causing protection to engage.
2. Check the condition of all wires and connections.
4. Low sound or distorted sound
The equipment is set to be low impedance
connection, but the speakers connected is
with high impedance.
5. Sound is distorted The input level of Mic or external equipment is
too high. Lower the input and raise the master.

4-16Ω100V
MUTE
AUDIO AUX2 AUX1
OUTPUT INPUT
MIC
LINE
PHANTOM
MIC
LINE
PHANTOM
MIC
LINE
PHANTOM
MIC
LINE
PHANTOM
MIC 4 MIC 3 MIC 2
EMC IN MUTE
GGG
G
+
MIC 1
NC
G
OUTPUT
100V/4-16Ω
NC NC
7. APPLICATIONS
REAR PANEL CONNECTIONS
10
OPEN
CLOSE
PLAY STOP NEXTPREVIOUS
ON
OFF
POWER
Audio source equipment
M I C
VOL
PLAY MSG
MIC
in
PLAY
SIREN
REC in
ON
OFF
STANDBY
PLAYALARM MODE RECORD
ST OPSTART
Alarm signal generator
Speaker
AC power input

11
8. BLOCK DIAGRAM
MIC1 MIC2 MIC3 MIC4
ENC IN
AUX2AUX1
2-STAGE EQ BA SS TREBLE
LEVEL Protection circuit
LED display
Fun control
Amplifier output
LEVEL LEVEL LEVEL LEVEL LEVEL
MUTE_MIC1
MUTE_ALL
Q2
GND
MUTE_ALL
Q1
GND
MUTE_MIC1
AUDIO OUT
Switchover between and 100V4-16Ω
DC 24V inverter
power supply
switching
power supply
Amplifier
module

12
9. SPECIFICATIONS
Overheat protection, overcurrent protection, short circuit protection
Forced fan to cool after side entry, boot to start the fan,
and do the variable speed processing infinitely.
MIC1,2,3,4 input:5mV±1mV/600 balanced European
terminal; AUX1,2 input:350mV±20mV/10K unbalanced
RCA connection terminal; EMC input:775mV±40mV/10K
balanced European terminal
Ω,
Ω,
Ω,
+40ºF~+100ºF
0ºF -155ºF
<95%(No condensation)
19×11.6×1.74 inches
180W
9.5 lbs.
~110V 50Hz
~120V 50Hz
~220V 50Hz
~230V 50Hz
~240V 50Hz
~110V 60Hz
~120V 60Hz
~220V 60Hz
~230V 60Hz
~240V 60Hz
120W
4-16Ω/100V
MIX OUT: 1000mV/470Ω
unbalanced RCA connection terminal
Bass:±10dB at 100Hz
Treble:±10dB at 10KHz
80Hz~16KHz(+ 1dB,-3dB)
Power indicator
≥50dB
MIC1、2、3:66dB；AUX1、2:85dB
≤0.05%(at 1KHz，1/3 rated power)
T-B120D
Protection Mode
Voltage
Operation Temperature
Storage Temperature
Relative Humidity
Power Consumption
Dimension
Weight
Cooling Mode
Input Sensitivity
Model
Rated Power
Output Level
Output Sensitivity&
Impedance
Tones
Frequency Response
SNR
THD
Indicator
Cross talk attenuation
S/N Ratio
X

4-16Ω100V
MUTE
AUDIO AUX2 AUX1
OUTPUT INPUT
MIC LINE PHANTOM MIC LINE PHANTOM MIC LINE PHANTOM MIC LINE PHANTOM
MIC 4 MIC 3 MIC 2
EMC IN MUTE
GGG
G
+
MIC 1
NC
G
OUTPUT
100V/4-16Ω
NC NC
ON
OFF
POWER
MIC1 INPUT
PROT
MIC /4 AUX 1 AUX 2MIC 3
MIC 1 MIC 2 MASTER
100V
SIG
CLIP
TREBLEBASS
10 0 10 0 10 0 10 0 10 0 10 0 4-16Ω
1.75
1.9
19
44
12.5
6
10. DIMENSIONAL DIAGRAM
14
UNIT:Inches
1.75
17.1
ON
OFF
POWER
MIC1 INPUT
PROT
MIC /4AUX 1 AUX 2MIC 3
MIC 1 MIC 2 MASTER
100V
SIG
CLIP
TREBLEBASS
10 0 10 0 10 0 10 0 10 0 10 0 4-16Ω
Warning: Keep all sides of the unit clear and free from dust and objects to
avoid overheating of the amplifier and potential fire hazards. A 1U vent
panel is suggested above the amplifier if rack mounted.

WARRANTY
VersionV1.3
This warranty protects you for a specific period (“Warranty Period”) from your date of purchase as stated in your bill of sale or as otherwise
established by Mixhits Audio. The specific Warranty Period is three years. Any warranty replacement parts or product will assume only the remainder
of the Warranty Period of the original product.
Except as otherwise stated in this policy, this warranty covers defects in materials and workmanship if: (1) you purchased this product from a dealer
that is a Mixhits Audio authorized dealer with respect to this product at the time of your purchase; (2) your original, dated bill of sale is presented
whenever warranty service is required during the warranty period; and (3) unless Mixhits Audio states otherwise, you purchased this product in brand
new condition.
This policy does not cover damage or loss: caused by accident (including force majeure or natural forces), misuse, abuse, neglect, product
modification; occurring during shipment (even when Mixhits Audio has arranged or paid for shipping); caused by failure to follow instructions in the
owner’s guide, including failure to perform recommended periodic or routine maintenance or improper maintenance; resulting from repairs by
someone Mixhits Audio did not authorize; to the decorative surface of this product; caused by using this product for other than its intended purpose,
or covered under any of your (or your installer’s) insurance policy or coverage. The following are also excluded from this warranty: claims based
upon any misrepresentations by the seller; if this product’s serial number has been altered, defaced or removed; deterioration of component parts,
the nature of which is to become worn or depleted with use, even if supplied by Mixhits Audio; any installation, removal or re-installation; any set-up
calibration or adjustment; any performance variations due to installation-related circumstances, such as program source quality or AC power
fluctuations.
If this product has a defect covered by this warranty, Mixhits Audio will, at its sole option, either: (1) repair this product at no charge to you, using new
or refurbished replacement parts, (2) exchange this product with a product that is new or which has been manufactured from new or serviceable
used parts and is at least functionally equivalent to this product, or (3) refund the purchase price of the product.
This warranty protects only the original end-user (“you”), and is not transferable. Any attempt to transfer this warranty shall immediately make this
warranty void. This warranty is valid only for Mixhits Audio Professional products, as listed above, purchased from authorized Mixhits Audio
Professional dealers within the fifty United States, and it does not apply to products purchased or transferred elsewhere. If you purchased this
product (or have subsequently transferred it) outside the fifty United States, you should contact your local Mixhits Audio distributor for warranty
information.
You are responsible for transporting your product to (as well as from, in the event that Mixhits Audio finds no defect covered by this warranty) either
Mixhits Audio or an authorized service center and for payment of all shipping charges; however, Mixhits Audio will pay the return shipping charges
(in the event you return the product to Mixhits Audio) if the repairs are covered by warranty, provided that, Mixhits Audio reserves the right to choose
the mode, the carrier and the timing of such return shipping (if Mixhits Audio finds that there are no defects covered by this warranty, then you shall
be responsible for all shipping charges). If you experience difficulty in transporting your product or are in need of packing materials, please advise us
and we may be able (but have no obligation) to suggest alternative procedures and/or provide adequate packing materials.
THIS WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, REMEDIES AND
CONDITIONS, WHETHER ORAL OR WRITTEN, EXPRESS OR IMPLIED. Mixhits Audio SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IF MIXHITS AUDIO CANNOT LAWFULLY DISCLAIM IMPLIED WARRANTIES UNDER THIS LIMITED WARRANTY, ALL SUCH WARRANTIES,
INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN DURATION TO THE
DURATION OF THIS WARRANTY.
No Mixhits Audio reseller, agent, or employee is authorized to make any modification, extension, or addition to this warranty.
MIXHITS AUDIO IS NOT RESPONSIBLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING
FROM ANY BREACH OF WARRANTY OR CONDITION, OR UNDER ANY OTHER LEGAL THEORY, INCLUDING BUT NOT LIMITED TO LOST
PROFITS, DOWNTIME, GOODWILL, DAMAGE TO OR REPLACEMENT OF ANY EQUIPMENT OR PROPERTY, ANY COSTS OF RECOVERING,
REPROGRAMMING, OR REPRODUCING ANY PROGRAM OR DATA STORED IN OR USED WITH Mixhits Audio PRODUCTS. Mixhits Audio’S
TOTAL LIABILITY IS LIMITED TO THE REPAIR OR REPLACEMENT OF THIS PRODUCT OR TO THE ORIGINAL PURCHASE PRICE
PURSUANT TO THE TERMS OF THIS WARRANTY.
SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES OR EXCLUSIONS OR
LIMITATIONS ON THE DURATION OF IMPLIED WARRANTIES OR CONDITIONS, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT
APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS THAT VARY BY
STATE OR (WHERE APPLICABLE IN THE COUNTRIES WHERE Mixhits Audio HAS NON-US/CANADIAN AUTHORIZED DEALERS) COUNTRY.
NO ACTION OR CLAIM TO ENFORCE THIS WARRANTY SHALL BE COMMENCED AFTER THE EXPIRATION OF THE WARRANTY PERIOD.