Alto Professional MISTRAL400 User Guide

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User's Manual

STEREO POWER

MISTRAL400

AMPLIFIER

LTO

www.altoproaudio.com

Version 1.1 MAY 2005

English

SAFETY RELATED SYMBOLS

CAUTION

RISK OFELECTRIC SHOCK

DO NOTOPEN

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.

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.

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.

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.

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.

Never cut off the internal or external protective grounding wire or disconnect the wiring of protective grounding terminal.

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.

IMPORTANT SAFETY INSTRUCTIONS

Read these instructions.

Follow all instructions. Keep these instructions. Heed all warnings. Only use attachments/accessories specified by the manufacturer.

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.

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.

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.

Preface

Dear Customer:

Thanks for choosing LTO MISTRAL400 Stereo Power 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 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 MISTRAL400 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 superiorreliability 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 MISTRAL400 Stereo Power Amplifier

a reality available to our customers, and thank our designers and all the LTO staff, there to make possible therealization 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

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 .................................................................................................. .....................................7

4.1 Stereo Mode

4.2 Bridge Mode

5. TECHNICAL SPECIFICATIONS ................................................................................................... ........9

6. WARRANTY ........... ................................................................................. ............................................10

1. INTRODUCTION

The MISTRAL400 is a line of high power, low profile, professional Power Amplifiers with advanced featuresLTO and great reliability. They deliver tremendous power in only one rack space, providing high level performance under the most demanding conditions. The amplifier frame contains all solid-state circuitry, using complementary silicon output devices. The amplifier contains two independent channels, with separate AC transformer secondaries. Each channel has also a main LED that becomes blue for power-on indicator, another red LED that shows true amplifier clipping and a yellow Power outputs employ standard power connectors. All the inputsone for the Limiter Stage. The are electronically balanced nsformer can be added on the input stage of each channel.and an high quality audio tra

2. FEATURES

1U 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.

2x100 Watts ( RMS on 4 ohms for MISTRAL400.

Stereo (dual-channel), or bridge mono operating modes.

Balanced XLR inputs to ensure noiseless long wiring.

Neutrik Speak-on connectors for output.

Single channel, bridge, and bi-amp output wiring possibility.

Front panel LED indicators for limit, power on and clip.

Accurate gain control.

Manufactured under QS9000, VDA 6.1 certified management system.

EIAJ)

3. CONTROL ELEMENTS

3.1 Front Panel

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Power Switch

Turn the unit power on or off.

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.

Output Limiter LED

While the unit is limiting the output signal, the LED lighting up.

Power LED

This LED lights up when the unit is powered.

Level Control for Channels1&2

Adjust the output signal level to avoid signal distortion.

3.2 Rear Panel

A. rear panelThis is set for 220V AC TO 240V AC

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

INPUT

LIMITER

CH1

NEW TIDE

OFF

CH2

NEW TIDE

MODE

STEREO

BRIDGE

B. rear PanelThis is set for 110V AC TO 120V AC

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

INPUT

LIMITER

CH1

NEW TIDE

OFF

CH2

NEW TIDE

MODE

STEREO

BRIDGE

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

CH2

1+ 1-

POS NEG

CH2

1+ 1-

POS NEG

POWER

CH2 CH1

TIP

OUTPUTS

TIP

POWER

CH2 CH1

TIP

OUTPUTS

Class

two wiring

two

wiring

TIP

CH1

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE 1+ 2+

POS NEG

CH1

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE 1+ 2+

POS NEG

Apparaten skall anslutas

till jordat uttag nar den

ansluts till ett natverk

AC INPUT:220-240V 50-60Hz

FUSE: T1.6AL 250VAC

Rated Power Consumption 200W

REPLACE FUSE WITH CORRECT TYPE ONLY

Apparaten skall anslutas

till jordat uttag nar den

ansluts till ett natverk

AC INPUT:110-120V 50-60Hz

FUSE: T3.15AL 250VAC

Rated Power Consumption 200W

REPLACE FUSE WITH CORRECT TYPE ONLY

Useonly with a 250V fuse

6 7

Useonly with a 250V fuse

6 7

Fuse Holder / Voltage Selector

This is a dual voltage unit. Before you attempt to connect and operate the unit, please make sure that your Local voltage matches the voltage on the fuse holder cover.

Caution: The fuse protecting the AC supplies circuits of this unit. The fuse can only be changed by a qualified technician, in the event of a fault or changing the supply voltage. If the fuse continues to blow after replacing, discontinue use of this unit before repaired.

220-240V

USEONLY WITH A 250V FUSE

EMPLOYERUNIQUEMENT AVEC

UNFUSIBLE DE 250V

110-120V

THIS IS SET FOR

220V AC TO 240V

AC OPERATION

110-120V

USEONLY WITH A 250V FUSE

EMPLOYERUNIQUEMENT AVEC

UNFUSIBLE DE 250V

220-240V

THIS IS SET FOR 110V AC TO 120V

AC OPERATION

The fuse holder above the AC connector on the rear of the chassis has 3 triangular markers (please refer to the above pictures), with two of these triangles opposing each other, your unit is set to the operating voltage printed next to these markers.

To change, pull fuse holder out and rotate 180 , then push in again.

AC Inlet

This connector is meant for the connection of the supplied main cord. Do not insert power cord into unit until voltage has been correctly set. Do not plug power cord into AC power until voltage has been correctly set.

Output Connector

These connectors are Neutrik connectors. You can choose proper connectorsspeakon according to practical need. For your safety, please be careful when do connecting work.

Limit 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.

Balanced Input Connector

These connectors connect the input signal of channel1 and channel 2 separately.

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.

- 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.

4. APPLICATION

Total two optional modes: Please see following diagram for connecting the power amplifier into your audio system.

4.1 Stereo Mode

MODE

STEREO BRIDGE

MODE Release this button

CH2

NEW TIDE

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

INPUT

Channel 2

LIMITER

OFF ON

Channel 1

Input Connector

Balanced

GND

INPUT

CH1

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

NEW TIDE

CH2

1+ 1-

POS NEG

Channel 1

POWER

CH2 CH1

TIP

OUTPUTS

TIP

CH1

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE 1+ 2+

POS NEG

Apparatenskall anslutas

tilljordat uttag nar den

anslutstill ett natverk

ACINPUT: 220-240V 50-60Hz

FUSE:T1.6AL 250VAC

RatedPower Consumption 200W

REPLACEFUSE WITH CORRECT TYPE ONLY

Useonly with a 250V fuse

Channel 2

MODE

STEREO BRIDGE

MODE Release this button

CH2

NEW TIDE

INPUT

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

Channel 2

LIMITER

OFF ON

Input Connector

Balanced

INPUT

CH1

NEW TIDE

Channel 1

GND

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

CH2

1+ 1-

POS NEG

POWER

CH2 CH1

TIP

OUTPUTS

TIP

CH1

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE 1+ 2+

POS NEG

Apparatenskall anslutas

tilljordat uttag nar den

anslutstill ett natverk

ACINPUT: 220-240V 50-60Hz

FUSE:T1.6AL 250VAC

RatedPower Consumption 200W

REPLACEFUSE WITH CORRECT TYPE ONLY

Useonly with a 250V fuse

Channel 1

Channel 2

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). volumeOnly the control of channel 1 is used to control the volume of whole system.

Input Connector

Balanced

GND

INPUT

CH2

NEW TIDE

MODE

STEREO

BRIDGE

MODE Press this button

INPUT

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

LIMITER

CH1

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

NEW TIDE

OFF

CH2

1+ 1-

POS NEG

TIP

POWER

CH2 CH1

OUTPUTS

TIP

CH1

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE 1+ 2+

POS NEG

Apparatenskall anslutas

tilljordat uttag nar den

anslutstill ett natverk

ACINPUT: 220-240V 50-60Hz

FUSE:T1.6AL 250VAC

RatedPower Consumption 200W

REPLACEFUSE WITH CORRECT TYPE ONLY

Useonly with a 250V fuse

Channel 1

Channel 2+

Channel 1+

5. TECHNICAL SPECIFICATIONS

MODEL

MISTRAL400

Output Power

20Hz 20KHz@0.1%THD, Stereo Mode

8 ohms per channel(EIAJ)

4 ohms per channel(EIAJ)

60W

100W

Bridge Mono Mode

8 ohms, 1KHz, 0.1%THD

Distortion (SMPTE-IM)

Frequency Response

Damping Factor, 1 kHz and below

Signal to Noise,20Hz-20KHz

Voltage Gain

Input Sensitivity @ 4 ohms

Input Clipping

Input Impedance

Controls

180W

<0.05%

20Hz-20KHz+0.1/ -3dB

>300 at 8ohms

102dB

40x (32dB)

1Vrms

10Vrms (+22dB)

10K ohms unbalanced, 20K ohms balanced 56 (36dB)

FRONT: AC SWITCH, CH1 & CH2 GAIN KNOBS

REAR: LIMITER, BRIDGE SELECTOR

Indicators (1 per channel)

Connectors, each channel

Load Protection

Power Requirements

Dimensions

Net Weight

Power-On: Blue LED

Limit: Yellow LED

Clip: Red LED

Input: Active balanced XLR and 1/4''TRS jack

Output: NEUTRIK Speakon and 1/4''TRS jack

On/off muting, DC-fault load grounding relay. Internal fault fuses.

220-240(110-120) Vac 50~60Hz

19" (48.3 cm) rack mounting, 1.7" (4.4 cm) tall (1 rack space),

11" (28 cm) deep (rack mounting to rear support ears)

7.5Kg

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 warrants that this product will be free from any defects in materials and/or workmanship for a period

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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, may repair or replace this product at its own option at no charge to you for

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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 be liable for any incidental or consequential damages. Some states do not allow the exclu-

LTO

sion 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.

SEIKAKU TECHNICAL GROUP LIMITED

SEKAKU ELECTRON INDUSTRY (H.K.) CO., LTD.

No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan

http://www.altoproaudio.com Tel: 886-4-22313737

email: alto@altoproaudio.com Fax: 886-4-22346757

without prior notice. Any photocopy, translation, or reproduction of part of this

NF02036-1.1

Alto Professional MISTRAL400 User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual