User's Manual
MACRO
PROFESSIONAL HIGH
POWER STEREO AMPLIFIER
830/1400/2400
R
Version 1.0 April 2002
English
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Preface
Dear Customer,
Thanks for choosing LTO MACRO 830/1400/2400 Professional High Power Stereo Amplifier and thanks for
choosing one of the results of LTO AUDIO TEAM job and researches.
For our LTO AUDIO TEAM, music and sound are more than a job ...are first of all passion and let us say...our
obsession!
We have been designing professional audio products for a long time in cooperation with some of the major brands
in the world in the audio field.
The
LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R&D
Centers in Italy, Netherlands, United Kingdom and Taiwan. The core of our digital audio products is a sophisticated
DSP (Digital Sound Processor) and a large range of state of the art algorithms which have been developed by our
Software Team for the last 7 years.
Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming
the quality of our job, we'd like to share with you our work and our dreams, paying attention to your suggestions
and your comments.
Following this idea we create our products and we will create the new ones! From our side, we guarantee you and
we will guarantee you also in future the best quality, and the best fruits of our continuous researches and the
best prices.
Our LTO MACRO 830/1400/2400 Professional High Power Stereo Amplifier is the result of many hours of listening
and tests involving common people, area experts, musicians and technicians.
The result of this effort is the sophisticated circuit design featuring high power and superb quality together with superior
reliability and stability to provide the highest possible audio performance.
Nothing else to add, but that we would like to thank all the people that made the LTO MACRO 830/1400/2400 Pro-
fessional High Power Stereo Amplifier a reality available to our customers, and thank our designers and all the LTO
staff, there to make possible the realization of products containing our idea of music and sound and there to support
you , our customers, in the best way, conscious that you are our best richness.
Thank you very much.
LTO AUDIO TEAM
2
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TABLE OF CONTENTS
1. INTRODUCTION.............................................................................................................4
2. FEATURE LIST...............................................................................................................4
3. CONTROL ELEMENTS...................................................................................................4
3.1 The Front Panel
3.2 The Rear Panel
4. INSTALLATION & CONNECTION.....................................................................................6
4.1 Mains Connection
4.2 Rack Mounting
4.3 Audio Connection
a .Wiring Configuration
b .In Line Connection
5. OPERATION ..................................................................................................................7
5.1 Operate MACRO 830/1400/2400 in Stereo Mode
5.1 Operate MACRO 830/1400/2400 in Parallel (Mono) Mode
5.1 Operate MACRO 830/1400/2400 in Bridged Mode
6. CAUTION FOR APPLICATION .................................................................................................9
6.1 General Application Instruction
6.2 Caution for Speaker Connection
7. TECHNICAL SPECIFICATIONS...............................................................................................10
7.1 Specifications
7.2 Block Diagram
8. WARRANTY.............................................................................................................................12
3
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1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by purchasing our MACRO 830/
1400/2400 Professional Stereo Amplifier . With the MACRO 830/1400/2400 you have acquired an extremely
musical and flexible High Power Amplifier which is based on many years of experience and findings in
amplifier technology and is used through the world in the renowned studios.
The MACRO 830/1400/2400 is used for professional output of stage stereo at three levels of power, with
excellent performance. Output power can be adjusted at the user's demand, and the sound quality and
protecting circuit are both sophisticated.
The front panel presents you with 6 LEDS (Power LED, Protection LED, Clip & Signal LED for both channels)
and 2 Level Controls (for both channels), you can operate this unit more precise and easier. The Output
Connectors are Speak-on jacks, and the binding post terminals are used for better matching. Before con-
necting this unit into your sound system, please make sure it is powered down to prevent any electric shock.
2. FEATURE LIST :
Sophisticated protecting circuits protect the machine from improper tampering
Input matching allows collection with any preamplifier
Excellent frequency echo and sound quality
High fidelity and low noise
Balanced XLR and 1/4" TRS Input Connectors
Output Connectors are speak-on jacks, and the binding post terminals are used for better matching
Output power can be switched between stereo , parallel and bridged
High-speed and low noise fan for releasing heat. When the temperature rises, the fan automatically switches
to high-speed, it re-back to normal speed at other times to reduce power consumption
Indicator for the output balance, as well as status indicators of SIG and CLIP. When there is any signal
(>100mV), the SIG LED lights up. When there is overload, the CLIP LED lights up. If anything abnormal
happens to the circuits, the CLIP LED will be continuously on, with no action from the circuits. This helps
the user to determine which status it is in.
White aluminum panels with acrylic presents an artistic and trendy look
Solid and durable, can be mounted into a cabinet
Manufactured under ISO9001 certified management system
3. CONTROL ELEMENTS
3.1 The Front Panel:
2
5
3
MACRO2400
PROFESSIONAL HIGH POWER STEREO AMPLIFIER
PROT
CLIP
SIG
CLIP
SIG
ON
R
OFF
POWER
CH-A
CH-B
1
4
1. MainsSwitch
This switch turns on and turns off the unit by controlling both phases.
2. Power LED
This Power LED lights up when the unit is powered up .
3. Clip LED
The Clip LEDs light up when distortion reaches or exceeds 0.5% approximately, which means the unit is
being driven by excessively high signal source ,and you'd better adjust the level control until these LEDs
re-eliminated .
Signal Indicator
These Signal Indicators light up when the output is more than 100Vm.
4
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4. Level controls for CHANNEL A, B
These level Controls are used to adjust the output signal level, you'd better adjust them properly to avoid any
distortion .
5. Protection LED
This red LED indicator lights up when the thermal-protection system is working ,no signal is output during this
protection period, and this means any overheating occurs inside the unit (the critical temperature is 80 ),
you must take actions to avoid this overheating ,e.g. :speed up the air circulation, decrease the signal level ...
If the problem is corrected, the protection systems deactivate automatically ,this LED eliminates ,and normal
amplifier operation is resumed .
3.2. The Rear Panel
12
6
7
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
R(
)
B R E A K E R
(
)
S(GND)
SEE INSTRUCTION BEFORE
USING!
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C H A N N E L
A
C H A N N E L
B
STEREO
PARALLEL
LINE
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
9
10 11
13
8
6. Breaker
This breaker is used to protect the unit in replacement of fuse. Press it to reset .
7. AC Inlet
This connector is meant for the connection of the supplied main cord. Do not insert the power cord into
this unit until voltage has been correctly set .Do not plug the power cord into the mains until the voltage
has been correctly set .
8. Output Connectors
The Output Connectors include the Speak-on jacks and Binding post terminals, you can use the specific
Output connectors according to the actual application circumstance.
Be careful to connect the Output Connectors so as not to occur any problem.
Caution :Turn off the unit before connecting the Output Connectors so as to avoid any electric shock!
9. Balanced Input Connectors
The Input Connectors include the balanced XLR servo connectors and 1/4"TRS phone jack .For the
extension to another amplifier, connect these jacks to another amplifier input jacks.
10. Clip Limit Switch
While on, the clip limit function specific to this machine keeps fixed output when the output exceeds the
Maximum of the machine to protect its circuits. While off, there is no such limit
11.Mode Selector
The MACRO 830/1400/2400 Professional Stereo Amplifier presents three operating modes:
- Stereo Mode
In this mode ,Channel A and Channel B operate independently (as a conventional stereo amplifier).
The Channel A input signal will be output from the Channel A output connectors, and the Channel B input signal
will be output from the Channel B output connectors.
- Parallel Mono Mode
In this mode, the Channel A input signal will be output from the output connectors of both Channels ,detail wiring
diagram you can refer to Chapter5.
- Bridged Mode
In this mode, the Channel A input signal will be output from the Bridge output connectors, detail wiring diagram
you can refer to Chapter5.
12.LF 30Hz Filter
Some large subsonic frequencies are present in the input signal and these can damage the consequent
5
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speaker systems by over loading or overheating .
This LF30Hz Filter is used to prevent this happening ,and add an appropriate low-pass filter in the input circuit
13.Fan
This fan releases the heating from the unit by accelerating the air circulation (air flow from front to back),
and its speed is continuously variable.
4. INSTALLATION & CONNECTION :
4.1 Mains Connection
Do not insert the power cord into this unit until voltage has been correctly set. Do not plug the power cord
into the mains until the voltage has been correctly set.
Please ensure that the MACRO 830/1400/2400 Professional Stereo Amplifier is supplied with the correct
voltage before turning on this unit.
If you can't power up this unit while turning on the Mains Switch (1), please check the Breaker (6) on the
rear panel first, maybe it is pressed to reset. Otherwise, contact the technician or qualified personnel for
any service.
Caution: To reduce the risk of electric shock, do not perform any servicing other than contained in this
manual unless you are qualified to do so.
Please turn off this unit before any installation and connection, esp .when you connect your unit into the
sound system. This is important to prevent damage to the unit itself as well as other consequent speaker
system.
The mains connection of the MACRO 830/1400/2400 Professional Stereo Amplifier is made by using the
enclosed power cord and a standard IEC receptacle, and it meets all of the international safety certification
requirements.
4.2 Rack Mounting
The most secure mounting is on a universal rack shelf available from various rack manufactures or your
music dealer. The MACRO 830/1400/2400 Professional Stereo Amplifier fits into one standard 19" rack unit
of space.
Be sure that there is enough air space around the unit for sufficient ventilation. If heat release is inadequate,
this unit will retain heat inside, which may cause the protection, or even a fire.
4.3 Audio Connection
The LTO MACRO 830/1400/2400 Professional High Power Amplifier presents with balanced XLR connectors
and 1/4" TRS phone jack and it can be interfaced by several ways to support a variety of applications
without any signal loss.
a. Wiring Configuration
Either the 1/4" TRS (Tip-Ring-Sleeve) phone jack or the XLR servo connector can be wired in balanced and
unbalanced modes, which will be determined by the actual application status, Please wire your systems as
the following examples:
For 1/4" TRS jack
1/4"TRS jack
Unbalanced Input
1/4"TRS jack
Balanced Input
For XLR connector
XLR Unbalanced Input
XLR Balanced Input
6
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b. In Line Connection
For these applications, the MACRO 830/1400/2400 Professional High Power Amplifier provides XLR connectors
And 1/4" TRS phone jack to easily interface with most professional audio devices. Follow the configuration
Examples below for your particular connection.
Balanced
Tip
Ring
Tip
Ring
Sleeve
Sleeve
TIP RING SLEEVE
SLEEVE RING TIP
1
2
1
2
3
3
Tip
Ring
1
2
3
Sleeve
TIP RING SLEEVE
Unbalanced
Tip
Ring
1
2
3
Sleeve
TIP RING SLEEVE
Tip
1
2
3
Sleeve
TIP SLEEVE
1
2
3
Centre
Screen
Tip
Tip
Sleeve
Sleeve
TIP SLEEVE
SLEEVE TIP
Tip
Ring
Tip
Ring
Sleeve
Sleeve
SLEEVE RING TIP
TIP RING SLEEVE
Tip
Centre
Screen
Sleeve
TIP SLEEVE
Tip
Ring
Centre
Screen
Sleeve
TIP RING SLEEVE
1
2
1
2
3
3
5.OPERATION
The MACRO 830/1400/2400 Professional High Power Stereo Amplifier provides three operating modes with
each unit: Stereo mode, Parallel (Mono) mode and Bridged mode, you can decide each specific operating
mode according to your actual application circumstance.
Following examples will show you the typical connections, you can refer to install your MACRO 830/1400/2400
into a sound system:
5.1 Operate MACRO 830/1400/2400 in Stereo Mode
In this mode, Channel A and Channel B operate independently ( as a conventional stereo amplifier).
The Channel A input signal will be output from the Channel A output connectors, and the Channel B input
signal will be output from the Channel B output connectors.
Input wiring tips
BALANCED
UNBALANCED
SHIELD
GND
1
2
1
2
3
3
FROM
SOURCE
FROM
SOURCE
INPUT
INPUT
+
+
SHIELD
SHIELD
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
SEE INSTRUCTION BEFORE
USING!
CHANNEL B
CHANNEL A
R(
)
B
R
E
A
K
E
R
(
)
S(GND)
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
STEREO
PARALLEL
LINE
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
BRIDGED
STEREO
PARALLEL
(MONO)
Channel B
+
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
E
E
E
W
W
W
W
T
T
T
T
I
I
I
I
D
D
D
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
N
2
E
1
N
2
E
1
N
2
E
1
Channel A
+
7
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Input wiring tips
BALANCED UNBALANCED
SHIELD
GND
1
2
1
2
3
3
FROM
SOURCE
FROM
SOURCE
INPUT
INPUT
+
+
SHIELD
SHIELD
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
SEE INSTRUCTION BEFORE
USING!
CHANNEL B
CHANNEL A
R(
)
B
R
E
A
K
E
R
(
)
S(GND)
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
STEREO
PARALLEL
LINE
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
BRIDGED
STEREO
PARALLEL
(MONO)
Channel B
PIN 1+
+
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
E
E
E
W
W
W
W
T
T
T
T
I
I
I
I
D
D
D
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
N
2
E
1
PIN 1-
2
E
1
N
2
E
1
Channel A
PIN 1+
+
PIN 1-
5.2 Operate MACRO 830/1400/2400 in Parallel (Mono) Mode
In this mode, the Channel A input signal will be output from the output connectors of both Channels.
The Channel B input jack is not used, the Channel A and B volumes can be adjusted independently.
Input wiring tips
BALANCED
UNBALANCED
SHIELD
GND
1
2
1
2
3
3
FROM
SOURCE
FROM
SOURCE
INPUT
INPUT
+
+
SHIELD
SHIELD
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
R(
)
B
R
E
A
K
E
R
NO USING
(
)
S(GND)
SEE INSTRUCTION BEFORE
USING!
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
STEREO
PARALLEL
LINE
CHANNEL A
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
BRIDGED
STEREO
PARALLEL
(MONO)
Channel B
+
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
E
E
E
W
W
W
W
T
T
T
T
I
I
I
I
D
D
D
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
N
2
E
1
N
2
E
1
N
2
E
1
Channel A
+
8
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Input wiring tips
BALANCED UNBALANCED
SHIELD
GND
1
2
1
2
3
3
FROM
SOURCE
FROM
SOURCE
INPUT
INPUT
+
+
SHIELD
SHIELD
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
R(
)
NO USING
(
)
B
R
E
A
K
E
R
S(GND)
SEE INSTRUCTION BEFORE
USING!
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
STEREO
PARALLEL
LINE
CHANNEL A
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
BRIDGED
STEREO
PARALLEL
(MONO)
Channel B
PIN 1+
+
N
2
E
W
T
I
D
E
1
2
W
T
I
D
E
1
2
W
T
I
D
E
1
2
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
E
E
E
W
W
W
W
T
T
T
T
I
I
I
I
D
D
D
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
N
2
E
1
N
2
E
1
PIN 1-
N
2
E
1
Channel A
PIN 1+
+
PIN 1-
5.3 Operate MACRO 830/1400/2400 in Bridged Mode
In this mode, the Channel A input signal will be output from the Bridge output connectors. In this case,
use the Channel A volume control to adjust the volume, keep the volume control of Channel B turned
completely down (counterclockwise).
Bridged Mode is intended for driving loads with a total impedance of 4 ohms or greater.
Input wiring tips
BALANCED
UNBALANCED
SHIELD
GND
1
2
1
2
3
3
FROM
SOURCE
FROM
SOURCE
INPUT
INPUT
+
+
SHIELD
SHIELD
INPUT
CONNECTION
CH-B
(+)
SRT
T(+)
2
1
3
LINE
WARNING
(GND)
TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO
RAIN OR MOISTURE.
SEE INSTRUCTION BEFORE
USING!
R(
)
B
R
E
A
K
E
R
(
)
S(GND)
NO USING
OFF
ON
LF 30HZ
FILTER
BRIDGED
MONO
BALANCED
INPUT
1.15V/20K
BRIDGED
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
STEREO
PARALLEL
LINE
CHANNEL A
(MONO)
MODEL
SERIAL
OFF
ON
CLIP LIMIT
CH-A
BRIDGED INPUT
BRIDGED
STEREO
PARALLEL
(MONO)
Channel B+
Channel A+
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
E
E
E
W
W
W
W
T
T
T
T
I
I
I
I
D
D
D
D
E
1
N
2
E
W
T
I
D
E
1
N
2
E
W
T
I
D
E
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
N
2
E
1
N
2
E
1
N
2
E
1
+
NO USING
6. CAUTION FOR APPLICATION
6.1 General Application Instruction
The following instructions describe the common ways to install your MACRO 830/1400/2400 Professional
Stereo Amplifier into a sound application system:
1. First, turn off power switch before connection.
2. Refer to Chapter 5 for speaker connection
3. MACRO 830/1400/2400 Professional Stereo Amplifier may be operated in one of the three modes, please
slide the Mode Selector (11) for the specific operating mode.
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6.2 Caution for Speaker Connection
The output capacity of out MACRO 830/1400/2400 Professional Stereo Amplifier is very high, be sure to use
a speaker system that has sufficient input capacity.
If the input capacity of your speaker system is lower than the rated output of the MACRO 830/1400/2400
Professional Stereo Amplifier, you can protect your speakers by connecting a fuse serially between the
speaker and the amplifier as shown below.
(+)
(-)
Fuse
+
-
Speaker
System
Output
MACRO2400
PROFESSIONAL HIGH POWER STEREO AMPLIFIER
PROT
CLIP
SIG
CLIP
SIG
ON
R
OFF
POWER
CH-A
CH-B
Use the following formula to determine the fuse capacity according to the speaker's input capacity.
Po=I2 R
I= Po/R
Po[W] : Speaker's continuous input capacity (noise or RMS)
R[ ] : Speaker's nominal impedance
I[A] : Required fuse capacity
As to the speaker cable, if you use a long one, use as thick a cable as possible to prevent deterioration
of the damping factor or power loss inside the cable.
7. TECHNICAL SPECIFICATIONS
7.1 Specifications
MACRO830
MACRO1400
800
MACRO2400
1400
POWER SPECIFICATIONS
480
300
2 Ohms
4 Ohms
8 Ohms
8 Ohms
4 Ohms
STEREO MODE
(Both channels driven)
20Hz~20KHz
450
750
205
310
575
560
900
1500
Bridge Mono Mode
20Hz~20kHz
800
1400
2500
600W
900W
1500W
1.15V(+4dBu)
ELECTRICAL SPECIFICATIONS
INPUT SENSITIVITY
1.15V(+3.4dBu)
1.15V(+3.4dBu)
INPUT IMPEDANCE
10K Unbalanced 20K Balanced
25Hz~25KHz +0/-1dB
-3dB points: 5Hz~50KHz
FREQUENCY RESPONSE
(at 10dB below rated output power)
30dB
<0.03%
100dB
600W
32dB
<0.03%
100dB
900W
34dB
<0.03%
100dB
1500W
VOLTAGE GAIN
DISTORTION(SMPTE-1M)
S/N ratio
GENERAL SPECIFICATIONS
Full short circuit, open circuit, thermal, ultrasonic, and RF protection stable into reactive
or mismatched loads, turn ON/OFF, muting, tried crowbar.
PROTECTIONS
CONTROLS
Front: AC switch 40-detect input level control for each channel.
Rear: stereo/ parallel/ bridged selector, 30Hz filter selector clip ON/OFF selector.
SIGNAL: 2 green LED
POWER: 1 green LED
CLIP:
2
red LED
INDICATORS
PROTECTION: 1 red LED
INPUT : Active balanced XLR and 1/4"(6.3mm)TRS
CONNECTORS
OUTPUT: "Touch-proof" binding posts and speak-on jacks.
POWER SUPPLY
DIMENSIONS
WEIGHT
Available for 110-120V or 220~240V AC, 50/60Hz
483 400 88.8mm(W
13.6kg
D
H)
15.6kg
19kg
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7.2 Block Diagram
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8. WARRANTY
1. WARRANTY REGISTRATION CARD
To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration
Card within 10 days of the Purchase Date.
All the information presented in this Warranty Registration Card gives the manufacturer a better under-
standing of the sales status, so as to purport a more effective and efficient after-sales warranty service.
Please fill out all the information carefully and genuinely, miswriting or absence of this card will void your
warranty service.
2. RETURN NOTICE
2.1 In case of return for any warranty service, please make sure that the product is well packed in its original
shipping carton, and it can protect your unit from any other extra damage.
2.2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine ,and
give detail information about your return address and contact telephone number .
2.3 A brief description of the defect will be appreciated.
2.4 Please prepay all the costs involved in the return shipping, handling and insurance.
3. TERMS AND CONDITIONS
3.1 LTO warrants that this product will be free from any defects in materials and/or workmanship for
a period of 1 year from the purchase date if you have completed the Warranty Registration Card in
time.
3.2 The warranty service is only available to the original consumer, who purchased this product directly
from the retail dealer, and it can not be transferred.
3.3 During the warranty service, LTO may repair or replace this product at its own option at no charge to
you for parts or for labor in accordance with the right side of this limited warranty.
3.4 This warranty does not apply to the damages to this product that occurred as the following conditions:
Instead of operating in accordance with the user's manual thoroughly, any abuse or misuse of this
product.
Normal tear and wear.
The product has been altered or modified in any way.
Damage which may have been caused either directly or indirectly by another product / force / etc
Abnormal service or repairing by anyone other than the qualified personnel or technician.
And in such cases, all the expenses will be charged to the buyer.
3.5 In no event shall LTO be liable for any incidental or consequential damages. Some states do not allow
the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitation
may not apply to you.
3.6 This warranty gives you the specific rights, and these rights are compatible with the state laws, you
may also have other statutory rights that may vary from state to state.
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