Alto AMX-120 Users Manual

User's Manual

AMX-120

12-CHANNEL MIXING CONSOLE

R

LTO

www.altoproaudio.com

Version 1.4 Septemper 2005

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.

1

PREFACE

Dear Customer:

Thank you for choosing the LTO AMX-120 12-Channel Mixing Console, which is the result of our LTO AUDIO
TEAM's endeavours.

For the LTO AUDIO TEAM, music and audio are more than a profession, it is a passion and an obsession!

We have, in fact, been designing professional audio products for a number of years in cooperation with many of the
world's major brands.

The LTO line represents unparalleled analogue and digital products made by musicians, for musicians. With our
design centres in Italy, the Netherlands, and the United Kingdom we provide you with world-class designs, while our
software development teams continue to develop an impressive range of audio specific algorithms.

By purchasing our LTO products you become the most important member of our LTO AUDIO TEAM. We would
like to share with you our passion for what we design and invite you to make suggestions, which will aid us in develop­ing future products for you. We guarantee you our commitment for quality, continual research and development,
and of course the best prices.

The LTO AMX-120 mixing console is equipped with 2 mono input channels (these are provided with ultra low noise
microphone pre-amplifiers and phantom power at +48 Volt), 8 stereo input channels and 2 TK IN. So, in total you have
12 input channels on your AMX-120. It is specifically designed for professional application.
Seeing is believing, let's meet the LTO AMX-120.

We would like to thank all the people who made the LTO AMX-120 12-Channel Mixing Console possible, especially
to our designers and LTO staff. It is their passion for music and professional audio that has made it possible for us
to offer you, our most important team member, our continued support.

Thank you very much

LTO AUDIO TEAM

2

TABLE OF CONTENTS

1.INTRODUCTION...................................................................................................................................................4

2.FEATURES...........................................................................................................................................................5

3.READY TO START?...............................................................................................................................................6

4.CONTROL ELEMENTS.......................................................................................................................................7

4.1 MONO MIC/LINE Channels..........................................................................................................................8

4.2 STEREO Inputs ...........................................................................................................................................9

4.3 MASTER Section ........................................................................................................................................10

4.4 CTRL ROOM OUTPUT Connectors .........................................................................................................11

4.5 2TK IN/OUT Connectors ............................................................................................................................11

4.6 AUX SENDS Connectors ...........................................................................................................................11

4.7 PHONES ....................................................................................................................................................11

4.8 MAIN MIX OUTPUT Connectors ..............................................................................................................11

4.9 REAR PANEL Description .........................................................................................................................12

5.INSTALLATION AND CONNECTION.....................................................................................................................13

6.FOR THE EXPERTS WHO WANT TO KNOW MORE..........................................................................................15

7.BLOCK DIAGRAMS.............................................................................................................................................16

8.TECHNICAL SPECIFICATION..............................................................................................................................17

9.WARRANTY...........................................................................................................................................................18

3

1. INTRODUCTION

Thank you very much for expressing your confidence in LTO products by purchasing LTO AMX-120 mixing console.
The AMX-120 is a professional compact mixer. You will get the smooth, accurate more natural and open sound from
this apparatus, and it is really ideal for small gigs, recording and fixed PA installations.

The AMX-120 mixing console is packed with some key features that can not be found in other consoles of its size:
2 mono input channels (these are provided with ultra low noise microphone pre-amplifiers and phantom power at
+48 Volt), each of which is provided with a 3 bands graphic equalizer for HI, MID and LOW controls; 8 stereo input
channels; highly accurate 4-segment bar graph meters and 2-Track inputs assign-able to main mix, control room /
headphone outputs etc..

Your AMX-120 is very easy to operate but we advise you to go through each section of this manual carefully. In this
way you will get the best out of your AMX-120.

4

2. FEATURES

The AMX-120 12-Channel Mixing Console is designed for professional application. It will provide the following features:

2 MIC input channels with gold plated XLRs and balanced LINE input

8 stereo input channels with balanced TRS jacks

Ultra-low noise discrete MIC pre-amps with +48V phantom power

Extremely high headroom offering more dynamic range

Switch-able low cut filter on each mono channel

Warm, natural 3-band EQ on each mono channel

Peak LED on each mono channel

+4dB / -10dB gain select switch on stereo channels

AUX send switch-able to PRE/POST fader

Control room and headphone outputs

2-Track inputs assignable to main mix, control room / headphone outputs

Highly accurate 4-segment bar graph meters

5

3. READY TO START?

3.1 Please check the AC voltage available in your country before connecting your AMX-120 to the AC socket.

3.2 Be sure that the main power switch is turned off before connecting the mixer to the AC socket. Also, you should
make sure that all Input and output controls are turned down. This will avoid damages to your speakers and avoid

excessive noise.

3.3 Before turning on the AMX-120 you shall connect it to a power amplifier and turn-on the mixer BEFORE the power
amplifier. Once you have finished your working session you shall turn the mixer off AFTER the power amplifier.

3.4 Before disconnecting the AMX-120 always turn-off the power switch.

3.5 Do not use solvents to clean your AMX-120. A dry and clean cloth will be OK.

6

4. CONTROL ELEMENTS

MIC 1

J T

J T

12

3

BAL OR

UNBAL

LINE IN 1

TRIM

+15dB -30dB LINE

0dB 44dB MIC

0

+15+15-15-15

0

2.5kHz

+12-12

0

EQ

HI

12kHz

MID

MIC 2

J T

J T

12

3

BAL OR

UNBAL

LINE IN 2

TRIM

+15dB -30dB LINE

44dB MIC

0dB

0

+15+15-15-15

0

2.5kHz

+12-12

0

AM

CTRL ROOM OUTPUT

L

2-TRACK IN/OUT

L

R

TAPE IN TAPE OUT

EQ

HI

12kHz

-

MID

8

0

LTO

-120

R

2TK IN

MAX

R

12-CHANNEL MIXING CONSOLE

AUX SENDS

LINE IN 3/4

LEFT (MONO)

RIGHT

2TK TO

CTRL ROOM

2TK TO MIX

TAPE

0

PHONES

LINE IN 5/6

LEFT (MONO)

RIGHT

-+15

8

0

0

LEFT (MONO)

RIGHTLEFT

LINE IN 7/8

AUX

POST
(PRE)

BAL

MAIN MIX OUTPUT

LEFT

LINE IN 9/10

LEFT (MONO)

RIGHT

0

8

-+15

+4dB

-10dB

RIGHTLEFT

0

RIGHT

RIGHT

AUX

POST
(PRE)

+4dB

-10dB

BAL

LOW
80Hz

+15+15-15-15

LOW CUT

0

AUX

POST
(PRE)

8

-+15

PAN

RIGHTLEFT

PEAK

8

-+15

1

LOW

80Hz

+15+15-15-15

LOW CUT

0

AUX

POST
(PRE)

8

-+15

PAN

RIGHTLEFT

PEAK

LEVELLEVEL

8

-+15

2

AUX SENDS

8

-+15

OUTPUT LEVEL

L

-20

R

8

-

MAIN MIX LEVEL

PHONES

CTRL ROOM

/

8

-

MAX

LEVEL

8

-+15

LEVEL

8

-+15

7/83/4

0

0

+5

CLIP

PH

PWR

AUX

POST
(PRE)

8

-+15

+4dB

-10dB

BAL

RIGHTLEFT

0

LEVEL

8

+15

-+15

0

AUX

POST
(PRE)

8

-+15

+4dB

-10dB

BAL

RIGHTLEFT

0

LEVEL

8

-+15

9/105/6

7

4.1 MONO MIC/LINE Channels

1

These are channel 1 through channel 2. You can connect balanced, low impe­dance microphones to the XLR socket. On the 1/4" jack you can connect either
a microphone or a line level instrument. You shall never connect an unbalanced
microphone to the XLR socket if you do not want to damage both the micro­phone and the mixer.

48 Volt phantom power

2

It is available only to the XLR Mic sockets. Never plug in a microphone when
phantom power is already on. Before turning phantom power on, make sure
that all faders are all the way down. In this way you will protect your stage
monitors and main loudspeakers.

-. INPUT LEVEL Setting

3

This control is provided with 2 different indication rings: One is for the mic­rophone and the other for the line levels. When you use a microphone you
shall read the OUTSIDE ring (0~44 dB), when you use a line level instrument
you shall read the INSIDE ring (+15~-30 dB). For optimum operation you
shall set this control in a way that the peak LED will blink also occasionally
in order to avoid distortion on the input channel.

-. LOW CUT Button

4

By pressing this button you will activate a 75 Hz low frequency filter with a
slope of 18 dB per octave. You can use this facility to reduce the hum noise
infected by the mains power supply, or the stage rumble while using a micro­phone.

-. 3 BANDS EQUALIZER

A 3-band equalizer is provided for mono input channels with a wide
range of frequency adjustment.

MIC 1

J T

J T

12

3

BAL OR

UNBAL

LINE IN 1

TRIM

+15dB -30dB LINE

0dB 44dB MIC

0

+15+15-15-15

0

2.5kHz

+12-12

0

+15+15-15-15

LOW CUT

0

AUX

8

-+15

PAN

RIGHTLEFT

LEVEL

8

-+15

1

EQ

HI

12kHz

MID

LOW
80Hz

POST
(PRE)

PEAK

1

3

5

6

7

4

8

9

10

11

HI

5

This is the Treble control. You can use it to get rid of high frequency
noises or to boost the sound of cymbals or the high harmonics of
the human voice. The gain range goes from -15dB to +15dB with
a center frequency of 12 kHz.

MID

6

This is the Midrange control. It can affect most fundamental fre­quencies of all musical instruments and human voice. An attentive
use of this control will give you any very wide panorama of sound
effects. The gain range goes from -12dB to +12dB and the center
frequency is 2.5 kHz.

8

ON

OFF

POWER

PHANTOM

2

LOW

7

This is the Bass control. Boost male voice or kickdrum and bass guitar. Your system will sound much bigger than
what it is. The gain range goes from -15dB to +15dB and the center frequency is 80 Hz.

-. AUX SEND Control

8

This control is used to adjust the level of the signal sent to AUX buses, and their adjustable range goes from - to
+15dB.

The AUX send is configured as POST-FADER, therefore, most of the times, it will be used for effects and processors
input, however, you can also changed it to PRE-FADER configuration according to the specific application. (For more
detail, please see chapter 6.)

-. PAN Control

9

Abbreviation of PANORAMA control for mono channels.

You can adjust the stereo image of the signal via this control. Keep this control in center position and your signal
will be positioned in the middle of stage. Turn this control fully counterclockwise and the signal will be present
only on the left speaker and vice-versa.

-. PEAK LED

10

Inside your AMX-120 the audio signal is monitored in several different stages and then sent to the PEAK LED.
When this LED blinks, it warns you that you are reaching signal saturation and possible distortion. The PEAK LED
will blink with a level that is 6dB before actual clipping.

-. LEVEL Control

11

This control will adjust the overall level of this channel and set the amount of signal sent to the main output.

4.2 STEREO Inputs

12

These are Channel 3 through 10. They are organised

LINE IN 3/4

LEFT (MONO)

LINE IN 5/6

LEFT (MONO)

LINE IN 7/8

LEFT (MONO)

LINE IN 9/10

LEFT (MONO)

in stereo pair and provided with 1/4" TRS sockets.

If you connect only the left jack, the input will operate

RIGHT

RIGHT

RIGHT

RIGHT

in mono mode.

0

-. BAL Control

13

Abbreviation of BALANCE control for stereo cha­nnels, this knob controls the balance between left
and right input sources.

LEFT

AUX

POST
(PRE)

8

-+15

+4dB

-10dB

BAL

RIGHT

0

LEVEL

8

-+15

3/4

8

14

13

11

12

9

-. +4dBu/-10dBV Switch

14

Your AMX-120 provides the gain select switch, which is used to adjust the sensitivity of line input on stereo channels.
Line level are considered to be between 1V and 2V RMS (+2dBu ~ +8dBu) in professional equipment, peak levels
may extend to over 10V RMS (+22dBu). The accepted standard for sound reinforcement equipment is +4dBu.

Unfortunately, many low budget components fall short of these levels, so we need to "baby" their level, and find an­other source for the signal strength necessary to drive the power amplifiers, in such situations, the -10dBV operating
level is compromised.

NOTE: The remaining controls of stereo channel are the same as in the mono channel section.

4.3 MASTER Section

-. MAIN MIX LEVEL Dial

15

This control sets the amount of signal sent either
to the main out socket or to the tape output.

-. OUTPUT LEVEL LED Display

16

This stereo 4 segments LED meter will indicate
the level of the overall output signal.

-. POWER LED

17

This LED indicates when the power is on in your
AMX-120.

-. PHANTOM LED

18

This LED indicates when the phantom power is
switched on.

21

22

16

2TK IN

8

-

MAX

0

AUX SENDS

8

-+15

OUTPUT LEVEL

L

-20

R

2TK TO

CTRL ROOM

2TK TO MIX

TAPE

0

PHONES

CTRL ROOM

/

8

-

MAX

0

+5

CLIP

PH

20

23

18

17

PWR

19

-. 2TK TO CTRL ROOM Switch

Engaging this button to route the 2 TRACK IN signal

19

8

-

MAIN MIX LEVEL

+15

into the control room output.

-. 2TK TO MIX Switch

20

15

Engaging this button to route the 2 TRACK IN signal
into the main output.

-. 2TK IN Control

21

This control is used to adjust the level of 2TK IN signal, which can be varied from - to MAX.

-. AUX SENDS Control

22

This control is used to determine the master AUX SEND levels, which can be varied from - to +15dB.

10

-. PHONES/CTRL ROOM Control

23

This control sets the amount of signal sent to the control room and headphone.

4.4 CTRL ROOM OUTPUT Connectors

24

These 1/4" sockets are used to send the control room signal to
the studio monitor speakers or a second set of PA.

4.5 2TK IN/OUT Connectors

25

-. TAPE IN

Use the tape input if you wish to listen to your mix from a taper
recorder or DAT. You can assign the signal coming from the taper
recorder either to a pair of studio monitor using the control room
assignment on the front panel or you can also send the signal
directly to the main mix.

-. TAPE OUT

These RCA jacks will route the main mix into a tape recorder.

CTRL ROOM OUTPUT

L

2-TRACK IN/OUT

L

R

TAPE IN

R

TAPE OUT

24

25

4.6 AUX SENDS Connector

26

These 1/4" sockets are used to send out the signal from the AUX

bus to external devices such effects.

4.7 PHONES

27

This socket will send out the mix signal to a pair of headphones.

4.8 MAIN MIX OUTPUT Connectors

28

The stereo output is supplied with 1/4" TRS sockets, which is used
to send the audio signal to an amplifier.

Through the main mix level control, you can adjust the output level
from - to +15dB.

AUX SENDS

26

PHONES

MAIN MIX OUTPUT

LEFT

27 28

RIGHT

11

4.9 REAR PANEL Description

ON

OFF

PHANTOM

POWER

RATED POWER CONSUMPTION: 11W

29

18VAC~

2

30

- POWER ON/OFF Switch

CAUTION

R SK OF ELECTR C SHOCK

DO NOT OPEN

WARNING: SHOCK HAZARD
AVIS: RISQUE DE CHOC ELECTRIQUE

DO NOT OPEN

29

MODEL

NE PASOUVRIR

SERIAL

This switch is used to turn the main power ON and OFF.

- PHANTOM ON/OFF Switch

2

This switch will apply +48 Volt Phantom Power only to the 2 XLR microphone inputs. Never connect microphones
when the phantom power is on already.

- AC INPUT Connector

30

This connector is used to connect the supplied AC adapter.

12

5. INSTALLATION AND CONNECTION

Ok, you have got to this point you are now in the position to successfully operate your AMX-120. However, we advise
you to read carefully the following section to be the real master of your own mix. Not paying attention enough to the
Input signal level, to the routing of the signal and the assignment of the signal will result in unwanted distortion, a
corrupted signal or no sound at all. So you should follow this procedure for every single channel:

Turn down all Input and output gain controls.

Connect phantom powered microphones before switching on the +48Volt phantom power switch.

If you have a power amplifier connected to your AMX-120 set the level of the amplifier at no more than 75%.

you are doing connecting a pair of headphones or a pair of powered studio monitor speakers.

Position HI, MID and LOW EQ controls on the middle.

Position panoramic (PAN) control on the center.

not light up.

At this point increase the input gain so that the PEAK LED will blink occasionally. In this way you will maintain good

headroom and ideal dynamic range.

Now connect a microphone and ask the singer to sing loud into the microphone. Turn slowly the gain control clockwise

and have the PEAK LED blink only occasionally.

whatNow, set the CONTROL ROOM/PHONES level at no more than 50%. In this way you will be able to hear later

doesWith a headphone or studio monitor speakers connected apply a line level input signal so that the PEAK LED

this case you can adjust the overall output level through the MAIN MIX control.

InNow repeat the same sequence for all input channels. The main LED meter could move up into the red section.

13

Audio Connection

5.1

Both XLR and 1/4 " TRS connectors are available on the unit. In this way you can interface the unit in several
different ways without experiencing any noise or signal loss. You can use the unit with single instruments using
The mixer's main insert or on "in-line" between a mixing console's output and a power amplifier.

- Wiring Configuration
Either the 1/4" TRS phone jack or XLR connector can be wired in balanced and unbalanced modes, which will
be determined by the actual application status, please wire your system as the following wiring examples:

For 1/4" Phone jack

+

+

+

-

Tip

Sleeve

TS Type Unbalanced

Ring

Tip

Sleeve

TRS Type Balanced

Ring

TRS Type Unbalanced

Tip

Sleeve

For XLR connector

Pin2 (+)

Pin3 ( )

Pin3 ( )

(Linked to Pin1 manually, )

Pin1 ( )

Pin1 ( )

XLR Type Unbalanced XLR Type alancedB

Pin2 (+)

- In-line Connection

For these applications the unit provides 1/4" TRS and XLR connectors to easily interface with most
professional for your particular connection.audio devices. Follow the configuration examples below

Balanced

TIPRING SLEEVE

3

2 1

TIPRING SLEEVE

Unbalanced

TIPRING SLEEVE

TIPSLEEVE

3

2 1

TIPSLEEVE

TIPRING SLEEVE

TIPSLEEVE

TIPRING SLEEVE

3

2 1

SLEEVE RINGTIP

SLEEVETIP

SLEEVE RINGTIP

Tip

Ring

1 2

3

1 2

3

1 2

3

1 2

3

1 2

3

Sleeve

Ring

Sleeve

Ring

Sleeve

Sleeve

Sleeve

Ring

Sleeve

Sleeve

Ring

Sleeve

1
2

3

Tip

Tip

Tip

1
2
3

Tip

Tip

Tip

Tip

1
2

3

Tip
Ring

Sleeve

1
2

3

1
2
3

1
2
3

1
2
3

Cent er

Screen

Tip

Sleeve

Tip
Ring

Sleeve

Cent er

Screen

Centre

Screen

1
2
3

14

6. FOR THE EXPERTS WHO WANT TO KNOW MORE

As we have told you previously in this manual, the AUX SEND control both on mono and on stereo channels is factory
wired as POST-FADER. If you have some skill in electronic components soldering you can modify this setting and have
all your AUX SENDS configured as PRE-FADER.

(PRE)

POST

AUX

Disconnect
the POST route

Before

Modification on mono and stereo channels

(PRE)

POST

AUX

Solder the PRE route

After

15

7. BLOCK DIAGRAMS

D

8

MAIN OUT

AUX SEND1

R

T

S

AUX SEND

7

6

MAIN MIX

R

LEVEL

MAIN MIX LEFT

T

S

C

LEFT

RIGHT

TAPE OUT

R

T

S

MAIN MIX RIGHT

2-TRACK

TAPE IN

LEVEL

2TK IN

2

2

1

3

1

3

1

3

2TK TO MIX

2

2TK TO CTRL ROOM

B

LEFT

RIGHT

R

T

T

S

S

R

PHONES

T

S

R

PHONES OUTPUT

CONTROL ROOM OUTPUT

1

3

2

CONTROLROOM

LEFT METER

RIGHT METER

&PHONES

A

8

7

6

5

EFX SEND
AUX 1

RIGHT BUS
LEFT BUS

PAN

4

LEVEL

HI

12K2.5K80

3

2

MID

LO

GAIN

3-BAND EQ

+

-

POST

121

AUX1

2

PRE

SG/OL

BALANCE

LEVEL

-

-

+

+

POST

AUX1

121

2

PRE

SG/OL

EFX SEND

AUX 1

RIGHT BUS

LEFT BUS

5

4

3

2

S

T

RN

TN

213

+48V

POWER

PHANTOM

MONO INPUT CHANNELS ( 1-2 )

1

MIC IN

LINE IN

D

MIC GAIN:0~60dB

R

3c5e1a4d2b

LINE IN TRIM:+15dB~-45dB

STEREO INPUT CHANNELS (3-10)

C

S

T

RN

TN

R

3c5e1a4d2b

LEFT(MONO)

RIGHT

1

B

A

16

8. TECHNICAL SPECIFICATION

Mono input channels

Microphone input
Frequency response
Distortion (THD & N)
Gain range 0dB to 44dB (MIC)

SNR (Signal to Noise Ratio)

Line input
Frequency response

Distortion (THD & N)
Sensitivity range

Stereo input channels

Line input
Frequency response
Distortion (THD & N)

Impedances

Microphone input
All other inputs
Tape out
All other output

Equalization

Hi shelving
Mid bell

Low shelving
Low Cut filter

Main Mix Section

Noise (Bus noise) Fader 0 dB, channels muted: 100dBr (ref.:+4dBu)

Max output

AUX Sends max out

Power supply (AC/AC Adaptor)

Main voltage

Power Consumption

Physical

Dimension (W D H)

Net weight
Shipping weight 2.3Kg (5.11lb)

electronically balanced, discrete input configuration
10Hz to 55kHz, + 3dB

0.005% at 4dBu, 1kHz+

115dB
electronically balanced
10Hz to 55kHz, 3dB

0.005% at 4dBu, 1kHz+
15dBu to 30dBu

+

Balanced
10Hz to 55kHz, 3dB

0.005% at +4dBu, 1kHz

1.4kOhm

10kOhm or greater

1kOhm
120Ohm

15dB @12kHz

+
+

12dB @2.5kHz

+

15dB @80Hz

75Hz, 18dB/oct.

Fader 0dB, all input channels assigned and set to
UNITY gain: 90dBr (ref.:+4dBu)

22dBu unbalanced, 1/4" jacks+

+22dBu

USA/Canada 100 120V~, 60Hz
Europe 210 240V~, 50Hz

U.K./Australia 240V~, 50Hz
11 watts

208mm 275.5mm 35/43mm
(6.06" 7.81" 1.01"/1.30")

1.65Kg (3.65lb)

+

+

17

9. 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

LTO

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

LTO

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.

18

SEIKAKU TECHNICAL GROUP LIMITED

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

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 2005 SEIKAKU GROUP

c

NF 1.401656