Alto Mistral-900 Users Manual

LTO

User's Manual

MISTRAL 900/1500

STEREO POWER AMPLIFIER

www.altoproaudio.com

Version 1.0 OCT. 2007

English

IMPORTANT SAFETY INSTRUCTION

CAUTION

RISK OFELECTRIC SHOCK

DO NOTOPEN

TO REDUCE THE RISK OF ELECTRIC SHOCK PLEASE DO NOT REMOVE THE COVER OR THE BACK PANEL OF THIS EQUIPMENT. THERE ARE NO PARTS NEEDED BY USER INSIDE THE EQUIPMENT. FOR SERVICE, PLEASE CONTACT QUALIFIED SERVICE CENTERS.

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.

Protective Ground Terminal AC mains (Alternating Current)

Hazardous Live Terminal ON: Denotes the product is turned on. OFF: Denotes the product is turned off.

CAUTION

Describes precautions that should be observed to prevent damage to the product.

Read this Manual carefully before operation. Keep this Manual in a safe place.

Be aware of all warnings reported

with this symbol.

Keep this Equipment away from water and moisture.

Clean it only with dry cloth. Do not use solvent or other chemicals.

Do not damp or cover any cooling opening. Install the equipment only in accordance with the Manufacturer's instructions.

Power Cords 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.

Unplug this equipment when unused for long

periods of time or during a storm.

Refer all service to qualified service personnel

only. Do not perform any servicing other than those instructions contained within the User's Manual.

To prevent fire and damage to the product,

10.

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.

WARNING

To reduce the risk of electric shock and fire, do not expose this equipment to moisture or rain.

Dispose of this product should notbeplacedinmunicipalwaste and should be separate collection.

Move this Equipment only with a cart,

11.

stand, tripod, or bracket, specified by the manufacturer, or sold with the Equipment. When a cart is used, use caution when moving the cart / equipment combination to avoid possible injury from tip over.

12.

Permanent hearing loss may be caused by exposure to \ extremely high noise levels. The US. Government's Occupational Safety and Health Administration (OSHA) has specified the permissible exposure to noise level. These are shown in the following chart:

HOURS X DAY

8 6 4 3 2 1,5 1 0,5 0,25 or less

According to OSHA, an exposure to high SPL in excess of these limits may result in the loss of heat. To avoid the potential damage of heat, it is recommended that Personnel exposed to equipment capable of generating high SPL use hearing protection while such equipment is under operation.

The apparatus shall be connected to a mains socket outlet with a protective earthing connection.

The mains plug or an appliance coupler is used as the disconnect device, the disconnect device shall remain readily operable.

EXAMPLE

SPL

Small gig

train

Subway train

High level desktop monitors

Classic music concert

100 102 105 110 115

Rock concert

IN THIS MANUAL:

1. INTRODUCTION.........................................................................1

2. FEATURES................................................................................1

3. CONTROL ELEMENTS................................................................2

4. APPLICATION............................................................................5

5. TECHNICAL SPECIFICATIONS

6. WARRANTY.............................................................................14

.....................................................13

1. INTRODUCTION

Thank you for purchasing the MISTRAL 900/1500. They are the 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 amplifiers contain two independent channels, with separate AC transformer secondaries, power supplies and protection system. Each channel has independent protective circuitry against open circuit, short circuit, mismatched loads and over temperature and LED indicators for operating/protection, limit, power on and clip. The power outputs employ standard power connectors and all the inputs are electronically balanced.

Enjoy your MISTRAL900/1500 and make sure to read this Manual carefully before operation.

2. FEATURES

Mountable in a 19" unit (2U), 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

2 300 Watt EIAJ on 4 ohms for MISTRAL 900

2 500 Watt EIAJ on 4 ohms for MISTRAL 1500

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 Over-heat protection for each channel

Manufactured under QS9000, VDA 6.1 certified management system

SPOTLIGHT

3. CONTROL ELEMENTS

2 3

1500

CH2

OPERATING/

4 5 6

LTO

POWER SWITCH

POWER

CH1

OFF

StereoPower Amplifier

It switches the amplifier ON and 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 the input level until the LED turns off.

OUTPUT LIMITER LED

When the unit limits the output signal, the LED lights up.

OPERATION AND PROTECTION LED

When there presets signal, the yellow LED lights up. When at protection status, the LED turns off.

POWER LED

This LED lights up when the unit is powered on.

LEVEL CONTROL (For CH1&CH2)

Adjust the output signal level to avoid signal distortion.

SPOTLIGHT

Rear panel

3. CONTROL ELEMENTS

COOLING FAN

NEW TDE

INPUT

14 11

POWER OUTPUTS

CH1

1+ 1-

PA ALLEL

O TPUT

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE

LMI ER

MODE

1+ 2+

TER O

RI GE

POS NEG

OUTPUT1

CH2

1+ 1-

POS NEG

PARA LEL

OUT UT

OUTPUT2

N W IDE

TIPPIN 2 RING/PN 3 SLEEVEPIN 1

CH1

TIPPIN 2 RING/PN 3

MODEL

SERAL

SLEEVEPIN 1

CH2

Appar ten s all nsutas tl jodat u t g den ansuts il e t na ve k

CH1

BREAKER

BRDGE MONO

CH2

810

This fan secures enough cooling for your amplifier. The fan speed is electronically regulated depending on the temperature of the power devices.

IEC SOCKET FOR AC POWER CABLE

Connect the supplied main cord. Do not insert the power cord into the MISTRAL

900/1500 amplifiers and into the AC Outlet until voltage has been correctly set.

CIRCUIT BREAKER (Manual reset button)

This is an electronic fuse for protecting the unit from possible damage. When the unit is overloaded or the temperature inside the unit is too high, this push type button will spring out and disconnect the power supply. Push the Breaker down again to restore normal working conditions.

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.

LIMITER SWITCH

Set the switch at "ON" position, when the output level is above maximum, the clip begins, thus keeping consistent output level for protecting apparatus. If the switch is set at "OFF" position, this clip function doesn't work.

BALANCED INPUT CONNECTOR

These connectors connect the input signal of CH 1 and CH 2 separately.

BALANCED OUTPUT CONNECTOR

These two output connectors are parallelled inside with input connectors. It enables the unit work under parallelled mode. Please also refer to wiring diagram for parallelled mode.

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