Alto L-12 Users Manual
User's Manual
12-CHANNEL COMPACT INTEGRATED
L-12
LIVE SOUND MIXER WITH DIGITAL EFFECTS
R
LTO
www.altoproaudio.com
Version 1.5 September 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 L-12 12-Channel Compact Integrated Live Sound Mixer with Digital Effects, 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 L-12 is an extremely flexible, ultra-low noise 12-channel compact integrated live sound mixer with Digital
Effects, 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 and PAN/BAL control etc.. Besides, the L-12 is equipped with the
miraculous 24 bit digital stereo effect processor with 256 presets. Seeing is believing, let's meet the LTO L-12.
We would like to thank all the people who made the LTO L-12 12-Channel Compact Integrated Live Sound Mixer
with Digital Effects 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 The mono MIC/LINE channels....................................................................................................................8
4.2 INPUT LEVEL setting..................................................................................................................................8
4.3 Mono Channel INSERT................................................................................................................................8
4.4 LOW-CUT FILTER......................................................................................................................................8
4.5 STEREO INPUTS........................................................................................................................................9
4.6 EQUALISER.................................................................................................................................................9
4.7 AUX SEND................................................................................................................................................10
4.8 PAN............................................................................................................................................................10
4.9 SG/PEAK....................................................................................................................................................10
4.10 MUTE.........................................................................................................................................................10
4.11 FADER ......................................................................................................................................................11
4.12 ASSIGNMENT Control......................................................................................................... .....................11
4.13 MASTER SECTION ..................................................................................................................................11
4.14 REAR PANEL DESCRIPTION ...................................................................................................................15
5. INSTALLATION AND CONNECTION.....................................................................................................................18
6. PRESET LIST........................................................................................................................................................21
7. SYSTEM BLOCK DIAGRAMS.............................................................................................................................22
8. TECHNICAL SPECIFICATION..............................................................................................................................23
9. WARRANTY...........................................................................................................................................................25
3
1. INTRODUCTION
Thank you very much for expressing your confidence in products by purchasing L-12 12 Channel CompactLTO LTO
Integrated Mixer with Digital Effects. The L-12 is professional compact mixer. You will get the smooth, accurate more
natural and open sound from this apparatus, it is really ideal for large gigs, recording and fixed PA installations.
The L-12 12 Channel Compact Integrated Mixer with Digital Effects is packed with features that can not be found in other
consoles of its size: 6 mono (these are provided with Ultra Low Noise microphone pre-amplifiers and Phantom Power
at +48 Volt) and 4 stereo input channels, and each of them is provided with warm, natural EQ (channel1-4 are mono
channels and equipped with 3 band MID sweep EQ; channel 5-12 are stereo channels and equipped with 4 band fixed
frequency EQ); (16 presets 16 variations); 4-AUX sends; se-24 bits digital stereo effect processor with 256 presets
parate level control on each channel; highly accurate 12-segment bar graph meters; 2-Track inputs assignable to main
mix, control room / headphone outputs; subgroups output and small and exquisite modelling.
Your L-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 L-12.
4
2. FEATURES
The L-12 12 Channel Compact Integrated Mixer with Digital Effects is designed for professional appliance. It will provide
the following features:
6 MIC input channels with gold plated XLRs and balanced LINE inputs
4 Stereo input channels with balanced TRS jacks
Ultra-low noise discrete Mic Preamps with +48V Phantom Power
Extremely high headroom offering more dynamic range
60mm high precision faders
Each input channel with Mute, SOLO function, overload & signal present LEDs and low cut filters (except for stereo
channel)
SUB 1-2, SUB 3-4 and MAIN L-R signal assignment switch
4 AUX sends per channel: 2 PRE/POST faders switch-able for monitoring application effects & sound processor input;
2 POST faders for internal digital DFX or as external send
4-band fixed EQ on stereo line channels
3-band EQ with swept mid on microphone channels
Channel inserts and direct outputs on each mono channel plus main mix insert for flexible connection of outboard
equipment
24-bit DSP effect
256 effects (16 presets 16 variations)
Stereo 9-band graphic EQ
BNC socket for connecting lamp
Control room/phones matrix
2-TRACK IN assignable to main mix, control room/headphone outputs
Highly accurate 12 segment output level meters
5
3. READY TO START?
3.1 Please check the AC Voltage available in your Country before connecting your L-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 L-12 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 L-12 always turn-off the Power switch.
3.5 Do not use solvents to clean your L-12. A dry and clean cloth will be OK.
6
4. CONTROL ELEMENTS
MIC 3MIC 1 MIC 2 MIC 4 MIC 5 MIC 6
12
3
LINE IN 1
BAL/UNBAL
INSERT
TRIM
1
0dB
60dB
MIC
45dB
+15dB
L NE
LOW CUT
75Hz
18dB Oct
0
EQ
HI
12kHz
+15+1501515
MID
+15
15
800
FREQ
8kHz
100Hz
0
LOW
80Hz
+15+151515
0
1
AUX
8
-+15
0
2
POST
PRE
8
-+15
0
3
DFX1
(EXT)
8
-+15
0
4
DFX2
( NT)
8
-+15
PAN
R GHTLEFT
SG PEAK
MUTE
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
1234
12
3
LINE IN 2
INSERT INSERT
LINE IN 3
BAL/UNBAL
TRIM
2
0dB
60dB
MIC
45dB
+15dB
LOW CUT
18dB/Oct
0
15
800
0
1
8
-+15
0
2
8
-+15
0
3
8
-+15
0
4
8
-+15
+15dB
LINE
75Hz
EQ
HI
12kHz
+15+1501515
MID
+15
FREQ
100Hz
8kHz0100Hz
LOW
80Hz
+15+151515
1
AUX
2
POST
PRE
3
DFX1
(EXT)
4
DFX2
(INT)
PAN
RIGHTLEFT
SG/PEAK
MUTE
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
3
BAL/UNBAL
TRIM
3
0dB
60dB
45dB
LINE
LOW CUT
75Hz
18dB/Oct
0
12kHz
+15+1501515
+15
15
800
FREQ
8kHz
0
LOW
80Hz
+15+151515
0
AUX
8
-+15
0
8
-+15
0
(EXT)
8
-+15
0
8
-+15
PAN
RIGHTLEFT
SG/PEAK
12
MIC
EQ
HI
MID
DFX1
DFX2
(INT)
MUTE
POST
PRE
LINE IN 4
INSERT
0dB
60dB
45dB
+15dB
LOW CUT
75Hz
18dB/Oct
0
+15+1501515
+15
15
800
8kHz0100Hz
+15+151515
0
1
8
-+15
0
2
8
-+15
0
3
8
-+15
0
4
8
-+15
RIGHTLEFT
SG/PEAK
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
12
3
BAL UNBAL
TRIM
4
MIC
LINE
EQ
12kHz
MID
FREQ
LOW
80Hz
AUX
DFX1
(EXT)
DFX2
(INT)
PAN
HI
POST
PRE
MUTE
2 TRACK IN/OUT
L
12
3
LINE IN 5
LEFT
(MONO)
BAL/UNBAL
LINE IN 6
RIGHT RIGHT B
MIC
GAIN
5
60dB
0dB
MIC
LOW CUT
75Hz
18dB/Oct
0
EQ
HI
12kHz
+15+1501515
HI M D
3kHz
+1515
0
M D LOW
500Hz
+1515
0
LOW
80Hz
+15+151515
0
1
AUX
8
-+15
0
2
POST
PRE
8
-+15
0
3
DFX1
(EXT)
8
-+15
0
4
DFX2
(INT)
8
-+15
BAL
RIGHTLEFT
SG/PEAK
MUTE
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
5/6 7/8
LINE IN 7
LINE IN 8
60dB
0dB
LOW CUT
75Hz
18dB/Oct
0
+15+1501515
+1515
0
+1515
0
+15+151515
0
1
8
-+15
0
2
8
-+15
0
3
8
-+15
0
4
8
-+15
RIGHTLEFT
SG/PEAK
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
12
3
LEFT
(MONO)
BAL/UNBAL
MIC
GAIN
6
M C
EQ
12kHz
HI M D
3kHz
M D LOW
500Hz
LOW
80Hz
AUX
DFX1
(EXT)
DFX2
(INT)
BAL
HI
MUTE
POST
PRE
TAPE INRTAPE OUT
LINE IN 9
LINE IN 10
1
8
-+15
2
8
-+15
3
8
-+15
4
8
-+15
LINE IN 11
LEFT
(MONO)
LINE IN 12
RIGHT
0
LINE
GAIN
9/10
+2020
0
EQ
HI
12kHz
+15+1501515
HI MID
3kHz
+1515
0
M D LOW
500Hz
+1515
0
LOW
80Hz
+15+151515
0
1
AUX
0
2
POST
PRE
0
3
DFX1
(EXT)
0
4
DFX2
( NT)
BAL
RIGHTLEFT
SG PEAK
MUTE
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
9/10 11/12
8
-+15
8
-+15
8
-+15
8
-+15
SG PEAK
R
LTO
12 CHANNEL COMPACT INTEGRATED LIVE SOUND MIXER
LAMP
12V 0.5A
PHONES
LEFT
(MONO)
RIGHT
0
LINE
GAIN
11/12
+2020
0
EQ
HI
12kHz
+15+1501515
HI MID
3kHz
+1515
0
MID LOW
500Hz
+1515
0
LOW
80Hz
+15+151515
0
AUX
0
POST
PRE
0
DFX1
(EXT)
0
DFX2
( NT)
BAL
R GHTLEFT
A
00
8
-+158-+15
+15
+10
+5
0
5
10
EQ OFF
EQ ON
15
0
8
-+15
0
8
-+15
0
8
-+15
0
8
-+15
LEFT LEFT
AUX1
8
-+15
AUX2
63
SOLO
SOLO
SOLO
SOLO
EFFECTS OUT
AUX SENDS
1
2
3
4
4 DFX2 SEND
WITH DIGITAL EFFECTS
24BITs
1. VOCAL 1
2. VOCAL 2
3. LARGE HALL
4. SMALL HALL
5. LARGE ROOM
6. SMALL ROOM
7. PLATE
8. TAPE REVERB
16
15
14
13
12
11
10
PRESETS
0
DFX2(INT) RETURN
EFFECTS TO MONITOR
STEREO AUX RETURNS
00
8
-+15
0
2
8
-+15
0
3
8
-+15
0
4
8
-+15
4 DFX2 RETURN
LEFT LEFT
1
2
8
9
500250125
STEREO GRAPHIC EQ
11
2
SUBGROUPS ASSIGNTO MAIN MIX
MUTE
10
dB
5
SUB 1 2SUB 1 2SUB 1 2SUB 1 2SUB 1 2SUB 1 2SUB 1 2SUB 1 2
0
-5
SUB 3 4SUB 3 4SUB 3 4SUB 3 4SUB 3 4SUB 3 4SUB 3 4SUB 3 4
-10
-20
MAIN L RMA N L RMA N L RMAIN L RMAIN L RMAIN L RMAIN L RMAIN L R
-25
-30
-40
-60
SOLOSOLOSOLOSOLOSOLOSOLOSOLOSOLO
10
10
dB
dB
5
5
0
0
-5
-5
-10
-10
-20
-20
-25
-25
-30
-30
-40
-40
-60
-60
SUB1 SUB2 SUB3 SUB4
SUBGROUPS
L-12
DIGITAL STEREO EFFECTS PROCESSOR
9. SPRING REVERB
10. MONO DELAY
11. STEREO DELAY
12. FLANGER
13. CHORUS
14. REVERB + DELAY
15. REVERB + FLANGER
16. REVERB + CHORUS
1
16
2
15
14
13
12
11
10
VARIATIONS
DSP MUTE
1K
TOAUX
SEND1
0
TOAUX
SEND2
AUX RETURN SOLO
MAIN M X
RIGHTR GHTRIGHT R GHT
3
4
5
6
7
8
9
PEAK
2K
CTRL ROOM SOURCE
MAIN MIX
SUB 1 2
SUB 3 4
2TK IN
2TK TO MIX
LEVEL SET
SOLO ACTIVE
SOLO MODE
PFL
AFL
3
4
5
6
7
8
-+15
8
-+15
MAIN M X
CTRL R
SUB 1/2
SUB 3/4
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
PWR
PHANTOM
16K
8K4K
8
-
PHONES
8
-
CTRL ROOM
CLIP
LR
OUTPUT
10
dB
5
0
-5
-10
-20
-25
-30
-40
-60
MAIN MIX
LEVEL
10
7
4
2
0
10
20
30
2
4
7
MAX
MAX
LEVEL
+15
+10
+5
0
5
10
15
7
4. CONTROL ELEMENTS
4.1 The mono MIC/LINE channels
1
These are Channel 1 through Channel 4. You can connect balanced, low impedance microphones to the XLR socket. On the 1/4" phone 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
4
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.
4.2 INPUT LEVEL setting
2
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 (0-60 dB),
When you use a Line level instrument you shall read the INSIDE
ring (+15~-45 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.
MIC 1
LINE IN 1
INSERT
0dB
-45dB
+15dB
LOW CUT
75Hz
18dB/Oct
3
BAL/UNBAL
60dB
12
TRIM
1
MIC
LINE
1
3
2
5
4.3 Mono Channel INSERT
Insert points are provided for the Mono Mic Channels. When you
insert a TRS jack in the insert socket, the signal will be taken out
3
POWER
ON
PHANTOM
after the Input Gain Control (Trim), sent to an external processor
such as a compressor-limiter, and returned into the channel strip
immediately before the EQ section. Of course, the jacks used must
OFF
be stereo (Tip Send/Ring Return).
4.4 LOW-CUT FILTER
5
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 function to reduce hum and stage rumble when using microphones.
4
8
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