Mistral 900, 1500 User Manual
User's Manual
STEREO POWER
MISTRAL900/1500
AMPLIFIER
R
LTO
www.altoproaudio.com
Version 1.2 August 2004
English
SAFETY RELATED SYMBOLS
CAUTION
RISK OFELECTRIC SHOCK
DO NOTOPEN
This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that
may be sufficient to constitute the risk of electric
shock or death.
This symbol, wherever used, alerts you to important operating and maintenance instructions.
Please read.
Fuse
To prevent fire and damage to the product, use only
the recommended fuse type as indicated in this
manual. Do not short-circuit the fuse holder. Before
replacing the fuse, make sure that the product is
OFF and disconnected from the AC outlet.
Protective Ground
Before turning the product ON, make sure that it is
connected to Ground. This is to prevent the risk of
electric shock.
Never cut internal or external Ground wires. Likewise,
never remove Ground wiring from the Protective
Ground Terminal.
Protective Ground Terminal
AC mains (Alternating Current)
Hazardous Live Terminal
ON: Denotes the product is turned on.
OFF: Denotes the product is turned off.
WARNING
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
Disposing of this product should not be
placed in municipal waste and should be
Separate collection.
WARNING
Power Supply
Ensure that the mains source voltage (AC outlet)
matches the voltage rating of the product. Failure
to do so could result in damage to the product and
possibly the user.
Unplug the product before electrical storms occur
and when unused for long periods of time to reduce
the risk of electric shock or fire.
External Connection
Always use proper ready-made insulated mains
cabling (power cord). Failure to do so could result
in shock/death or fire. If in doubt, seek advice from
a registered electrician.
Do Not Remove Any Covers
Within the product are areas where high voltages
may present. To reduce the risk of electric shock do
not remove any covers unless the AC mains power
cord is removed.
Covers should be removed by qualified service
personnel only.
No user serviceable parts inside.
Operating Conditions
Always install in accordance with the manufacturer's
instructions.
To avoid the risk of electric shock and damage, do
not subject this product to any liquid/rain or moisture.
Do not use this product when in close proximity to
water.
Do not install this product near any direct heat source.
Do not block areas of ventilation. Failure to do so
could result in fire.
Keep product away from naked flames.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
Only use attachments/accessories specified by the
manufacturer.
Power Cord and Plug
Do not tamper with the power cord or plug. These are
designed for your safety.
Do not remove Ground connections!
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
Do not place heavy objects on the power cord. This
could cause electric shock or fire.
Cleaning
When required, either blow off dust from the product
or use a dry cloth.
Do not use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Servicing
Refer all servicing to qualified service personnel only.
Do not perform any servicing other than those instructions contained within the User's Manual.
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Preface
Dear Customer:
Thanks for choosing LTO MISTRAL Stereo Power Amplifier and thanks for choosing one of
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 o and your comments.ur job, we'd like to share with you our work and our dreams, paying attention to your suggestions
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 MISTRAL1500/900 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.
1500/900 The results of LTO
Nothing else to add, but that we would like to thank all the people that made the LTO MISTRAL1500/900 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
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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
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1. MISTRAL1500/900LTO
The MISTRAL is a line of high power, low profile, professional Power Amplifiers with advanced features andLTO
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
2x300 Watts EIAJ on 4 ohms for MISTRAL900,
2x500 Watts EIAJ on 4 ohms for MISTRAL1500.
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.
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