Alto Mistral-400 Users Manual

R

LTO

User's Manual

MISTRAL 400

STEREO POWER AMPLIFIER

www.altoproaudio.com

Version 1.0 NOV. 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.

1.

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

2.

Be aware of all warnings reported

3.

with this symbol.

4.

Keep this Equipment away from water and
moisture.

5.

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

6.

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

7.

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

8.

periods of time or during a storm.

Refer all service to qualified service personnel

9.

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.

MovethisEquipmentonlywithacart,

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

90

train

92

Subway train

95

High level desktop monitors

97

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............................................................................4

5. TECHNICAL SPECIFICATIONS

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

6. WARRANTY...............................................................................8

1. INTRODUCTION

Thank you for your purchasing the MISTRAL 400.
The MISTRAL 400 is a line of high power, low profile, professional Power Amplifiers
with advanced features and great reliability. It delivers tremendous power in only
one rack space, providing high level performance under the most demanding
conditions. The amplifier contains two independent channels, each channel with
separate AC transformer secondaries and
clip

. The Power outputs employ standard power connectors and all the inputs

are electronically balanced.

Enjoy your MISTRAL 400 and make sure to read this Manual carefully before
operation.

LED indicators for limit, power on and

2. FEATURES

Mountable in a 19" unit (1U), 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

2 100 Watt EIAJ on 4 ohms for MISTRAL 400

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

1

SPOTLIGHT

3. CONTROL ELEMENTS

Front panel

2 31

LTO

45

5

1

POWER SWITCH

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

3

OUTPUT LIMITER LED

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

4

POWER LED

This LED lights up when the unit is powered on.

5

LEVEL CONTROLS (For CH1&CH2)

Adjust the output signal level to avoid signal distortion.

2

SPOTLIGHT

Rear panel

3. CONTROL ELEMENTS

8

INPUT

CH2

TIPPIN 2
RING/PN 3
SLEEVEPIN 1

NW TDE

MODE

ST REO

1

BRDGE

10

6

AC INLET AND FUSE HOLDER

IMI ER

FF
ON

9

Appaat ns alans utas

CH2

CH1

NW TDE

1

TIPPIN 2
RING/PN 3
SLEEVE/PIN1

1+ 1-

POS NEG

TP

SP
SP

CH2 CH1

S

1+ 1­OS NE

2+ 2­OS NEG

BRDGE
1+ 2+

POS NEG

CH1

CH2

il j rdatu t g den

ansu s ll e t vek

AC NPUT 10 12 V50 60Hz

FUSE T3 15AL 50VAC

Raed Pow rConsumpton 200W

REPLACEFUSE WI HCORRECTT PEONLY

7

6

Connect the supplied main cord. Do not insert the power cord into the MISTRAL
400 amplifier and into the AC Outlet until voltage has been correctly set.
If the fuse blows, replaced with a fuse of the correct type only.

7

OUTPUT CONNECTOR

These connectors have two kinds: 1/4 TRS jack and Neutrik connector. You can
choose proper connectors according to practical need. For your safety, please
be careful when do connecting work.

8

LIMITER SWITCH

Set the switch at "ON" position, if a very high level signal is driven into the amplifier,
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.

9

BALANCED INPUT CONNECTOR

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

10

MODE SELECTOR

The MISTRAL 400 power amplifier presents two operating modes:

- Stereo Mode
In this mode, CH 1 and CH 2 operate independently (as a normal stereo amplifier).
The CH 1 input signal will be output from the CH 1 output connector, and CH 2
input signal will be output from the CH 2 output connector.

- Bridge Mode
In this mode, CH 1 input signal will be output from the bridge-mono output connector.
On the other hand, the output level control of CH 2 should be turned to the minimum.

3

4. APPLICATION

The MISTRAL 400 amplifier provides two operating modes: stereo mode and bridge
mode, you can decide each specific operating mode according to your actual application
circumstance. Please see following diagram for connecting the power amplifier into
your audio system.

- Stereo Mode

In this mode, CH 1 and CH 2 operate independently (as a normal stereo amplifier). The
CH 1 input signal will be output from the CH 1 output connectors, and the CH 2 input
signal will be output from the CH 2 output connectors.

Stereo Mode

Release this button

Input Connector

Balanced

GND

1

3

2

+

CH 1

INPUT

POS NEG

CH1
1+ 1­OS NE

CH2
2+ 2­OS NEG

BRDGE
1+ 2+

Appaa en ka l ans ut s

il ordaut ag den

an lu s t ll tt vek

AC NPUT 110 20V 50 60Hz

FUSE T3 5AL 250VAC

Raed Power Consump ion 200W

REPLACEFUSE W TH CORRECT TYPE ONLY

NPUT

CH2

TIPPIN 2
RING/PN 3
SLEEVE/PIN1

EW TDE

MODE

S EREO

1

BRDGE

CH1

EW TDE

IMTER

OFF

1

ON

CH 2

CH 1

TP PIN 2
RING/PN 3
SLEEVE/PN 1

1+ 1-

POS NEG

CH2

CH2 CH1

TIP

SP
SP

S

+

CH 2

4

- Stereo Mode

1

3

2

INPUT

4. APPLICATION

Input Connector

Balanced

GND

Stereo Mode

Release this button

INPUT

CH2

TIP/PN 2
RNG PIN 3
SLEEVEPIN 1

NW TDE

MODE

3

STE EO

21

RDGE

CH 2

CH1

NW TDE

LMITER

OFF

21

ON

CH 1

TIPPIN 2
RING/PN 3
SLEEVEPIN 1

1+ 1-

POS NEG

CH2

CH2 CH1

TP

S
S

CH1
1+ 1­OS NEG

CH2
2+ 2­OS NEG

BRDGE
1+ 2+
OS NEG

Appaaten sk ll nsltas

tl jodat u tag nar en

ansuts ile tnaverk

AC NPUT 10 120V 50 0Hz

FUSE T3 15AL 25VAC

Rat d Power C nsumpton200W

REPLACEFUSE WITH CORRECT TYPE ONLY

CH 1

CH 2

5

4. APPLICATION

- Bridge Mode

In this mode, the CH 1 input signal will be output from the bridge output connector.
On the other hand, the output level control of CH 2 should be turned down to minimum
(turn the volume control at counterclockwise). Only the volume control of CH 1 is used
to control the volume of the whole system.

Input Connector

Balanced

GND

1

2

INPUT

Bridge Mode

Press this button

INPUT

CH2

TIPPIN 2
RNG/P N 3
SLEEVEPIN 1

NW TDE

MODE

T REO

1

BRDGE

CH1

NW TDE

LMI ER

FF

1

ON

TIPPIN 2
RING/PN 3
SLEEVEPIN 1

1+ 1-

POS NEG

CH2

CH2 CH1

TP

SP
SP

S

1+ 1-

OS NE

2+ 2-

OS NEG

BRDGE
1+ 2+
POS NEG

CH1

CH2

Appaat ns alans utas

t l jo dat u t g den

ansu s il e t vek

AC NPUT 10 12 V50 60Hz

FUSE T3 15AL 20VAC

Raed P w r Consumpt on 200W

REPLACE USEWITHCORRECT TYPE ONLY

CH 1

CH 2

CH 1

+

6

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 provide 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

LT O
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, 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 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.

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8

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

SEIKAKU TECHNICAL GROUP LIMITED

http://www.altoproaudio.com Tel: [phone]

email: [e-mail] Fax: [phone]

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 2007 Seikaku Group

c