Alto S-12 Users Manual
User's Manual
S-12
12-CHANNEL MIXING CONSOLE
R
LTO
www.altoproaudio.com
Version 2.3 August 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.
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PREFACE
Dear Customer:
Thank you for choosing the LTO S-12 12-Channel Mixing Console, which is the result of our LTO AUDIO TEAM's
endeavours.
For the LTO AUDIO TEAM, music and audio is 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 S-12 is an extremely flexible, ultra-low noise 12-channel console, configured with 4 mono and 4 stereo input
channels, each channel is equipped with a variety of key features including a warm, natural sounding EQ, Peak LEDs
MUTE/ALT3-4, SOLO-in-place and high quality fader.
We would like to thank all the people who made the LTO S-12 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
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TABLE OF CONTENTS
1.INTRODUCTION........................................................................................................................................................4
2.FEATURES................................................................................................................................................................5
3.GETTING STARTED...................................................................................................................................................6
4.CONTROL ELEMENTS.............................................................................................................................................7
4.1 The mono MIC/LINE channels..........................................................................................................................8
4.2 INPUT LEVEL setting......................................................................................................................................8
4.3 LOW CUT FILTER............................................................................................................................................8
4.4 STEREO INPUTS.............................................................................................................................................9
4.5 +4dBu / -10dBV................................................................................................................................................9
4.6 PHONES..........................................................................................................................................................9
4.7 The 3 BANDS EQUALISER...............................................................................................................................9
4.8 AUX SEND .....................................................................................................................................................10
4.9 PAN..................................................................................................................................................................10
4.10 MUTE / ALT 3-4 .............................................................................................................................................10
4.11 SOLO ............................................................................................................................................................10
4.12 SOLO LED .....................................................................................................................................................10
4.13 PEAK..............................................................................................................................................................10
4.14 FADER...........................................................................................................................................................10
4.15 INSERT...........................................................................................................................................................11
4.16 MAIN SECTION.............................................................................................................................................11
4.17 REAR PANEL ................................................................................................................................................14
5.INSTALLATION & CONNECTION...............................................................................................................................15
6.FOR THE EXPERTS WHO WANT TO KNOW MORE.................................................................................................18
7.SYSTEM BLOCK DIAGRAMS...................................................................................................................................19
8.TECHNICAL SPECIFICATIONS..................................................................................................................................20
9.WARRANTY................................................................................................................................................................21
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1.INTRODUCTION
Your S-12 is a 12-channel mixer and it is one of the most popular compact mixing consoles in the world. In fact it has
been sold already in terms of thousands of units worldwide. Despite its compact dimensions, great performances and
sound quality are insured thanks to the specification of the components used and the building quality.
Your S-12 is packed with features that can not be found in other consoles of its size: 4 Mono (these are provided with
Ultra Low Noise microphone preamplifiers and Phantom Power at +48 Volt) and 4 stereo input channels are provided,
and each of them is provided with a 3 bands graphic equaliser for HI, MID and LOW controls, MUTE/ALT 3-4, SOLOin-place and high quality fader etc..
Your S-12 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 S-12.
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2. FEATURES
The S-12 12-Channel Mixing Console is designed for the professional application, and presents with the following specific
features:
-. Ultra-low noise 12-channel 2+2-bus mixing console
-. 4 MIC input channels with gold plated XLRs and balanced Line inputs
-. 4 stereo input channels with balanced TRS jacks
-. 2 additional multi-functional stereo AUX Returns
-. Ultra-low noise discrete MIC preamps with +48V Phantom power
-. Low noise, high headroom
-. Peak LEDs on each channel
-. TRS and XLR outputs, Phones / Control Room output and Alt output.
-. 2 Aux Sends per channel for external effects and monitoring
-. 2-Track inputs assignable to Main Mix, outputs
-. Mute / Alt 3-4, Solo function on each channel
-. Highly accurate 12-segment Bar-graph meters
-. +4dBu / -10dBV on each stereo channel
-. Switchable Low Cut filter on each mono channel
-. Inserts on MIC channels
-. High quality faders and potentiometers
Phones / Control Room
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3. GETTING STARTED
3.1 Please check the AC Voltage available in your Country before connecting your S-12 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 S-12 you shall connect it to a power amplifier and turn-on the mixer BEFORE the power amp-
lifier. Once you have finished your working session you shall turn the mixer off AFTER the power amplifier.
3.4 Before disconnecting the S-12 always turn-off the Power switch.
3.5 Do not use solvents to clean your S-12. A dry and clean cloth will be OK.
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