Nilfisk ALTO Stereo Amplifier MACRO 1400 User Manual

User's Manual  
MACRO  
PROFESSIONAL HIGH  
POWER STEREO AMPLIFIER  
830/1400/2400  
R
Version 1.0 April 2002  
English  
 
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
 
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
 
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
 
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
 
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
 
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
 
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
 
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.  
9
 
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  
10  
 
7.2 Block Diagram  
11  
 
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.  
12  
 

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