Alto MISTRAL 4000 User`s manual

Alto MISTRAL 4000 User`s manual
User's Manual
MISTRAL4000
STEREO POWER
AMPLIFIER
R
LTO
www.altoproaudio.com
Version 1.2 August 2004
English
SAFETY RELATED SYMBOLS
Never cut off the internal or external protective grounding
wire or disconnect the wiring of protective grounding terminal.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Operating Conditions
This apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as
vases, shall be placed on this apparatus.
To reduce the risk of fire or electric shock, do not expose
this apparatus to rain or moisture.
Do not use this apparatus near water.
Install in accordance with the manufacturer's instructions.
Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
Do not block any ventilation openings.
No naked flame sources, such as lighted candles, should
be placed on the apparatus.
The symbol is used to indicate that some hazardous live terminals are involved within this apparatus,
even under the normal operating conditions.
The symbol is used in the service documentation
to indicate that a specific component shall be only
replaced by the component specified in that documentation for safety reasons.
Protective grounding terminal.
Alternating current /voltage.
Hazardous live terminal.
ON: Denotes the apparatus is turned on.
OFF: Denotes the apparatus is turned off, because it uses
the single pole switch, be sure to unplug the AC power to
prevent any electric shock before you proceed with your
service.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions.
Follow all instructions.
Keep these instructions.
Heed all warnings.
Only use attachments/accessories specified by the manufacturer.
WARNING: Describes precautions that should be
observed to prevent the danger of injury or death to
the user.
CAUTION: Describes precautions that should be
observed to prevent danger of the apparatus.
Power Cord and Plug
Do not defeat the safety purpose of the polarized or
grounding type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety.
If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched
particularly at the plug, convenience receptacles, and
the point where they exit from the apparatus.
WARNING
Power Supply
Ensures the source voltage matches the voltage of the
power supply before turning ON the apparatus.
Unplug this apparatus during lightning storms or when
unused for long periods of time.
External Connection
The external wiring connected to the output hazardous
live terminals requires installation by an instructed person,
or the use of ready-made leads or cords.
Cleaning
When the apparatus needs a cleaning, you can blow off
dust from the apparatus with a blower or clean with a rag
etc. Don't use solvents such as benzol, alcohol, or other
fluids with very strong volatility and flammability for cleaning
the apparatus body.
Clean only with a dry cloth.
Do not Remove any Cover
There are maybe some areas with high voltages inside,
to reduce the risk of electric shock, do not remove any
cover if the power supply is connected.
The cover should be removed by qualified personnel
only.
No user serviceable parts inside.
Servicing
Refer all servicing to qualified personnel. To reduce the
risk of electric shock, do not perform any servicing other
than that contained in the operating instructions unless
you are qualified to do so.
Servicing is required when the apparatus has been damaged in any way, such as the power supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been
dropped.
Fuse
To prevent a fire, make sure to use fuses with specified
standard (current, voltage, type). Do not use a different
fuse or short circuit the fuse holder.
Before replacing the fuse, turn OFF the apparatus and
dis-connect the power source.
Protective Grounding
Make sure to connect the protective grounding to prevent
any electric shock before turning ON the apparatus.
1
Preface
Dear Customer:
Thanks for choosing LTO MISTRAL-4000 Stereo Power Amplifier and thanks for choosing one of The results of
AUDIO TEAM job and researches.
LTO
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 MISTRAL4000 Stereo Power 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 MISTRAL4000 Stereo PowerAmplifier
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. FEATURES .... .........................................................................................................................................4
3. CONTROL ELEMENTS............................................................................................................................5
3.1 The Front Panel
3.2 The Rear Panel
4. APPLICATION.......................................................................................................................................8
4.1 Stereo Mode
4.2 Bridge Mode
5. TECHNICAL SPECIFICATIONS..........................................................................................................11
6. WARRANTY ........................................................................................................................................12
3
1.
LTO MISTRAL4000
The LTO MISTRAL is a line of high power, low profile, professional Power Amplifiers with advanced features and
great reliability. They deliver tremendous power in only two rack spaces, providing high level performance under the
most demanding conditions. An automatic speed fan matches cooling capacity with heat requirements. The amplifier
frame contains all solid-state circuitry, using complementary silicon output devices. The amplifier is supplied with a single
moulded AC cord having an appropriate AC plug for the intended operating voltage. The amplifier employs forced air
cooling with a variable speed fan for minimum acoustic noise. Air flow is from rear to front to avoid temperature rise
inside the Rack. The amplifier contains two independent channels, with separate AC transformer secondaries, power
supplies and protection system. All protection systems, except the main AC one, are self resetting upon removal of fault,
and the remaining channel shall continue to operate. Each channel has independent protective circuitry against open
circuit, short circuit, mismatched loads and over temperature. Each channel has also a main LED that becomes green
for power-on indicator and red for muting or protection, another red LED that shows true amplifier clipping and a yellow
one for the Limiter stage. The power outputs employ standard power connectors. All the inputs are electronically balanced
and an high quality audio transformer can be added on the input stage of each channel.
2. FEATURES
2U rack, stereo high power amplifier.
Fantastic audio quality even with extremely high volume levels.
Solid and durable, can be mounted into a cabinet.
User-controllable clip limiter
2x1000 Watts (EIAJ) RMS on 4 ohms for MISTRAL4000.
Stereo (dual-channel), or bridge mono operating modes.
Balanced XLR inputs / parallel outputs to ensure noiseless long wiring.
Binding post and Neutrik Speak-on connectors for output.
Single channel, bridge, and bi-amp output wiring possibility.
Front panel LED indicators for operating/protection, limit, power on and clip.
Accurate gain control
Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers.
Single channel over-heat protection.
Manufactured under QS9000, VDA 6.1 certified management system.
4
3. CONTROL ELEMENTS
3.1 Front Panel
2 3
4000
ON
CH1
CH2
CLIP
LIMIT
OPERATING/
PROTECTION
POWER ON
OFF
R
POWER
LTO
Stereo Power Amplifier
1
6
4
5
6
1 Power Switch
Turn the unit power on or off.
2 Clip Led
When the signal distortion reaches or surpasses 0.5%, the Led lights up. This means the output level of signal
source is too high and it is time to reduce input level until clip led turning off.
3 Output Limiter Led
While the unit is limiting the output signal, the Led lighting up.
4 Operation and protection Led
In normal operation, the Led is green; If the Led is red, it means the unit is in heat protection, no signal output
at the time and over-heat inside the unit (the surface temperature of power transistor is 110 ), the temperature
must be lowered through better ventilation and decrease the signal level etc. After the temperature dropped, the
protection stop and meanwhile the Led turning off with the unit recover normal work.
5 Power Led
This Led lights up when the unit is powered.
6 Level Control for Channels 1 & 2
Adjust the output signal level to avoid signal distortion.
3.2 Rear Panel
14
11
8
11
POWER OUTPUTS
CH1
1+
1POS NEG
MODEL
CH2
INPUT
2
1
CH2
NEW
3
CH1
TIDE
NEW
3
2
STEREO
BRIDGE
13
2
2
1
3
3
1
1
2+
POS
2NEG
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIDE
MODE
PARALLEL
OUTPUT
INPUT
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
CH1
OUTPUT1
SERIAL
BREAKER
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CH2
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
BALANCED
INPUT
11
12
OFF
ON
10
5
PARALLEL
OUTPUT
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
OUTPUT2
9
7
7 Power Source Socket
It is used to connect power cord, after setting the proper voltage, connect one end of power cord with the unit
and another end with mains.
8 Manual Reset Pushing-Button
This switch works as fuse for protecting the unit from damage. When the unit is overloaded or the temperature
inside the unit is too high, this pushing-button will spring up and break the power supply. The power supply will
be restored with pushing this switch down again.
9 Output Connector
These connectors have two kinds: Binding post and Neutrik connector. You can choose proper connectors
according to practical need. For your safety, please be careful when do connecting work.
10
Clip Switch
Set this switch at "ON" position, once the output level is above maximum output level, the clip begin, thus keeping
consistent output level for protecting apparatus. If the switch is set at "OFF", this clip function doesn't work.
11
Balanced Input Connector
These connectors connect the input signal of channel1 and channel 2 separately.
12
Balanced Output Connector
These two output connectors are paralleled inside with input connectors. It enables the unit work under
paralleled mode. Please also refer to wiring diagram for paralleled mode.
13
Mode Selector
Total two optional modes: Up for Stereo mode; Down for Bridge mode.
- Stereo
In this mode, Channel 1 and Channel 2 operate independently ( just as traditional stereo amplifier). The signal
input into channel 1 can be output from channel 1 only, similarly, the signal input into channel 2 can be output
from channel 2 only.
You can also operate the paralleled mode via outside wiring, so, the signal input from channel 1 or 2 will be output
from both channel 1 and 2 simultaneously. Details refer to the chapter 4.
- Bridge
In this mode, the signal input into channel 1 will be output from the bridged end, on other hand, the output
level control of channel 2 should be turn down to smallest.
14
Fan
The fan can accelerate the flow of air to lower the temperature inside unit. The inside temperature determines
the fan speed which controls the inside air flowing speed.
6
4. APPLICATION
Total two optional modes:
Please see following diagram for connecting the power amplifier into your audio system.
4.1 Stereo Mode
In this mode, Channel 1 and Channel 2 operate independently ( just as traditional stereo amplifier). The signal
input into channel 1 can be output from channel 1 only, similarly, the signal input into channel 2 can be output from
channel 2 only.
+
Input Connector
Balanced
Channel 1
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
CH2
1
NEW
3
TIDE
NEW
2
TIDE
2
1
MODE
MODE
Release this button
CH1
OUTPUT1
SERIAL
BREAKER
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
1
3
3
1
MODEL
CH2
2+
2POS NEG
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
CH1
3
2
PARALLEL
OUTPUT
INPUT
INPUT
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CH2
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
STEREO
BRIDGE
BALANCED
INPUT
BALANCED
INPUT
Channel 2
OFF
ON
PARALLEL
OUTPUT
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
OUTPUT2
Channel 1
+
Channel 2
Input Connector
Balanced
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
1
CH2
NEW
3
CH1
TIDE
NEW
3
2
2
MODE
Release this button
STEREO
BRIDGE
2
TIDE
1
3
1
MODEL
CH2
2+
2POS NEG
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
3
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
CH1
OUTPUT1
BALANCED
INPUT
Channel 2
OFF
ON
PARALLEL
OUTPUT
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
CH2
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
SERIAL
BREAKER
OUTPUT2
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
Channel 1
+
Channel 1
+
Channel 2
7
You can also operate the paralleled mode via outside wiring, so, the signal input from channel 1 or 2 will be output
from both channel 1 and 2 simultaneously. The volume of channel 1 or channel 2 can be controlled separately.
+
Input Connector
Balanced
Channel 1
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
CH2
1
NEW
3
TIDE
NEW
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
CH1
3
2
2
TIDE
2
1
3
3
1
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
MODEL
CH2
2+
2POS NEG
CH1
SERIAL
BREAKER
OUTPUT1
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CH2
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
STEREO
BRIDGE
BALANCED
INPUT
PARALLEL
OUTPUT
OFF
ON
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
OUTPUT2
MODE
Release this button
Channel 2
+
Channel 2
Input Connector
Balanced
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
1
CH2
NEW
3
TIDE
CH1
NEW
3
2
2
STEREO
BRIDGE
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
TIDE
1
3
3
1
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
MODEL
CH2
2+
2POS NEG
CH1
OUTPUT1
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
CH2
BALANCED
INPUT
OFF
ON
PARALLEL
OUTPUT
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
SERIAL
BREAKER
BRIDGE
MONO
OUTPUT2
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
MODE
Release this button
Channel 2
Channel 1
+
Channel 2
+
8
+
Input Connector
Balanced
Channel 1
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
INPUT
INPUT
CH2
1
NEW
3
CH1
TIDE
NEW
3
2
TIDE
1
2
1
MODE
CH1
OUTPUT1
SERIAL
BREAKER
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
1
3
3
2
PARALLEL
OUTPUT
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
MODEL
CH2
2+
2POS NEG
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CH2
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
STEREO
BRIDGE
MODE
Release this button
BALANCED
INPUT
OFF
ON
PARALLEL
OUTPUT
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
OUTPUT2
Channel 1
+
Channel 2
Input Connector
Balanced
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
1
CH2
NEW
3
CH1
TIDE
NEW
3
2
2
STEREO
BRIDGE
2
TIDE
1
3
1
MODEL
CH2
2+
2POS NEG
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
3
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
CH1
OUTPUT1
BALANCED
INPUT
OFF
ON
PARALLEL
OUTPUT
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
CH2
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
SERIAL
BREAKER
OUTPUT2
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
MODE
Release this button
Channel 1
Channel 1
+
Channel 2
+
9
4.2 Bridge Mode
In this mode, the signal input into channel 1 will be output from the bridged end, on other hand, the output level
control of channel 2 should be turn down to smallest (turn the volume control at counterclockwise). Only the volume
control of channel 1 is used to control the volume of whole system.
Input Connector
Balanced
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
CH2
1
NEW
3
CH1
TIDE
NEW
3
2
STEREO
BRIDGE
2
TIDE
2
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
1
3
3
1
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
MODEL
CH2
2+
2POS NEG
CH1
SERIAL
BREAKER
OUTPUT1
BRIDGE
MONO
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CH2
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
BALANCED
INPUT
OFF
ON
PARALLEL
OUTPUT
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
OUTPUT2
MODE
Press this button
Channel 1
Channel 2+
Channel 1+
Input Connector
Balanced
GND
1
3
2
INPUT
POWER OUTPUTS
CH1
1+
1POS NEG
INPUT
INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
2
1
CH2
NEW
3
CH1
TIDE
NEW
3
2
2
STEREO
BRIDGE
2
TIDE
1
3
1
MODEL
CH2
2+
2POS NEG
BRIDGE
1+
2+
POS NEG
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
3
1
MODE
PARALLEL
OUTPUT
INPUT
INPUT
CH1
OUTPUT1
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
CH2
1+
1POS NEG
CAUTION
CH2
BALANCED
INPUT
OFF
ON
PARALLEL
OUTPUT
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
LIMITER
BALANCED
INPUT
SERIAL
BREAKER
BRIDGE
MONO
OUTPUT2
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
MODE
Press this button
Channel 1
10
Channel 2+
-
Channel 1+
+
+
5. TECHNICAL SPECIFICATIONS
MODEL
MISTRAL4000
20Hz [email protected]%THD, Stereo Mode
8 ohms per channel(EIAJ)
620W
4 ohms per channel(EIAJ)
1000W
Bridge Mono Mode
8 ohms, 1KHz, 0.1%THD
2000W
Distortion (SMPTE-IM)
<0.05%
Frequency Response
20Hz-20KHz
Damping Factor, 1 kHz and below
>300 at 8ohms
Signal to Noise,20Hz-20KHz
102dB
Voltage Gain
40x (32dB)
Input Sensitivity @ 4 ohms
1Vrms
Input Clipping
10Vrms (+22dB)
Input Impedance
10K ohms unbalanced, 20K ohms balanced 56 (36dB)
Controls
FRONT: AC SWITCH, CH1 & CH2 GAIN KNOBS
1dB, -3dB points: 10Hz-60KHz
REAR: LIMITER, BRIDGE SELECTOR
Indicators (1 per channel)
Power-On: Blue LED
Operation/Protection : Dual Color (Green/Red LED)
Limit: Red LED
Clip: Red LED
Connectors, each channel
Input: Active balanced XLR
Parallel Output : XLR
R
Output: NEUTRIK Speakon and Binding posts
Cooling
Continuously variable-speed fan, rear-to-front air flow
Load Protection
On/off muting, DC-fault load grounding relay. Internal fault fuses.
Power Requirements
200-240(100-120) Vac 50~60Hz
Dimensions
19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 rack spaces),
15.9" (40 cm) deep (rack mounting to rear support ears)
Net Weight
18.1Kg
PRELIMINART
11
6. 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 understanding 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
SEKAKU ELECTRON INDUSTRY (H.K.) CO. LTD.
No.1, Lane 17, Sec. 2, Han Shi West Road, Taichung, 401 TAIWAN
http://www.altoproaudio.com
Tel:886-4-22313737
email: [email protected] Fax:886-4-22346757
All rights reserved to ALTO. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of this
manual without written permission is forbidden. Copyright c 2004 Sekaku Electron
NF 01499-1.3
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