User's Manual
AMX-120
12-CHANNEL MIXING CONSOLE
R
Version 1.4 Septemper 2005
English
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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 develop-
ing 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
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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
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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
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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
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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
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4. CONTROL ELEMENTS
R
MIC 1
MIC 2
-120
12-CHANNEL MIXING CONSOLE
AM
J.T.
J.T.
AUX SENDS
MAIN MIX OUTPUT
LEFT
2
1
2
1
PHONES
RIGHT
3
3
CTRL ROOM OUTPUT
L
R
BAL OR
BAL OR
UNBAL
UNBAL
LINE IN 3/4
LINE IN 5/6
LINE IN 7/8
LINE IN 9/10
2-TRACK IN/OUT
LINE IN 1
LINE IN 2
L
TRIM
TRIM
LEFT (MONO)
LEFT (MONO)
LEFT (MONO)
LEFT (MONO)
R
+15dB -30dB LINE
+15dB -30dB LINE
0dB
44dB MIC
0dB
44dB MIC
TAPE IN
TAPE OUT
RIGHT
RIGHT
RIGHT
RIGHT
0
0
0
0
0
0
0
0
EQ
EQ
AUX
AUX
POST
(PRE)
POST
(PRE)
HI
HI
12kHz
12kHz
2TK IN
2TK TO
CTRL ROOM
-15
-12
-15
+15
+12
+15
-15
-12
-15
+15
+12
+15
-
+15
-
+15
-
MAX
+4dB
-10dB
+4dB
-10dB
MID
MID
BAL
BAL
2.5kHz
2.5kHz
2TK TO MIX
LEFT
0
RIGHT
LEFT
RIGHT
0
TAPE
0
0
LOW
80Hz
LOW
80Hz
LEVEL
LEVEL
PHONES
CTRL ROOM
AUX SENDS
/
-
+15
-
+15
-
-
+15
MAX
LOW CUT
LOW CUT
OUTPUT LEVEL
3/4
7/8
L
0
0
0
0
AUX
AUX
AUX
AUX
-20
0
+5
CLIP
PH
POST
(PRE)
POST
(PRE)
POST
(PRE)
POST
(PRE)
R
PWR
-
+15
-
+15
-
+15
-
+15
+4dB
-10dB
+4dB
-10dB
PAN
PAN
BAL
BAL
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
0
LEFT
RIGHT
0
PEAK
PEAK
LEVEL
LEVEL
LEVEL
LEVEL
-
+15
-
+15
-
+15
-
+15
-
+15
MAIN MIX LEVEL
1
2
5/6
9/10
7
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4.1 MONO MIC/LINE Channels
1
These are channel 1 through channel 2. You can connect balanced, low impe-
dance 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 micro-
phone and the mixer.
MIC 1
J.T.
2
1
3
1
BAL OR
UNBAL
48 Volt phantom power
2
LINE IN 1
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.
TRIM
3
+15dB -30dB LINE
0dB
44dB MIC
3
-. INPUT LEVEL Setting
0
0
0
This control is provided with 2 different indication rings: One is for the mic-
rophone 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.
EQ
HI
5
6
12kHz
-15
-12
-15
+15
+12
+15
MID
2.5kHz
7
4
LOW
80Hz
-. LOW CUT Button
4
LOW CUT
0
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 micro-
phone.
AUX
POST
(PRE)
8
9
-
+15
PAN
LEFT
RIGHT
10
11
PEAK
LEVEL
-. 3 BANDS EQUALIZER
-
+15
A 3-band equalizer is provided for mono input channels with a wide
range of frequency adjustment.
1
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.
ON
MID
6
OFF
PHANTOM
POWER
This is the Midrange control. It can affect most fundamental fre-
quencies 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.
2
8
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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.
LINE IN 3/4
LINE IN 5/6
LINE IN 7/8
LINE IN 9/10
12
4.2 STEREO Inputs
12
LEFT (MONO)
LEFT (MONO)
LEFT (MONO)
LEFT (MONO)
These are Channel 3 through 10. They are organised
in stereo pair and provided with 1/4" TRS sockets.
RIGHT
RIGHT
RIGHT
RIGHT
If you connect only the left jack, the input will operate
in mono mode.
0
AUX
-. BAL Control
13
POST
(PRE)
8
Abbreviation of BALANCE control for stereo cha-
nnels, this knob controls the balance between left
and right input sources.
-
+15
14
+4dB
-10dB
BAL
13
11
LEFT
RIGHT
0
LEVEL
-
+15
3/4
9
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-. +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 an-
other 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.
19
20
23
21
-. OUTPUT LEVEL LED Display
2TK IN
16
2TK TO
CTRL ROOM
-
MAX
This stereo 4 segments LED meter will indicate
the level of the overall output signal.
2TK TO MIX
TAPE
0
0
-. POWER LED
17
PHONES
CTRL ROOM
22
16
AUX SENDS
/
-
-
+15
MAX
This LED indicates when the power is on in your
AMX-120.
OUTPUT LEVEL
L
18
17
-20
0
+5
CLIP
PH
R
PWR
-. PHANTOM LED
18
This LED indicates when the phantom power is
switched on.
-. 2TK TO CTRL ROOM Switch
19
-
+15
Engaging this button to route the 2 TRACK IN signal
into the control room output.
MAIN MIX LEVEL
15
-. 2TK TO MIX Switch
20
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
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-. 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.
CTRL ROOM OUTPUT
L
R
24
25
2-TRACK IN/OUT
L
4.5 2TK IN/OUT Connectors
-. TAPE IN
25
R
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 IN
TAPE OUT
-. TAPE OUT
These RCA jacks will route the main mix into a tape recorder.
4.6 AUX SENDS Connector
26
AUX SENDS
MAIN MIX OUTPUT
LEFT
PHONES
RIGHT
These 1/4" sockets are used to send out the signal from the AUX
bus to external devices such effects.
4.7 PHONES
27
26
27
28
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.
11
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4.9 REAR PANEL Description
ON
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MODEL
SERIAL
WARNING: SHOCK HAZARD
-
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR
-
18VAC~
OFF
POWER PHANTOM
RATED POWER CONSUMPTION: 11W
29
2
30
- POWER ON/OFF Switch
29
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
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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%.
Now, set the CONTROL ROOM/PHONES level at no more than 50%. In this way you will be able to hear later what
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.
With a headphone or studio monitor speakers connected apply a line level input signal so that the PEAK LED does
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.
Now repeat the same sequence for all input channels. The main LED meter could move up into the red section. In
this case you can adjust the overall output level through the MAIN MIX control.
13
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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
Tip
Sleeve
Tip
Ring
Ring
Sleeve
TS Type Unbalanced
TRS Type Balanced
TRS Type Unbalanced
For XLR connector
Pin2 (+)
Pin2 (+)
Pin3 (-)
Pin3 (-)
(Linked to Pin1 manually,
)
Pin1 (
)
Pin1 (
)
XLR Type Unbalanced
XLR Type Balanced
- In-line Connection
For these applications the unit provides 1/4" TRS and XLR connectors to easily interface with most
professional audio devices. Follow the configuration examples below for your particular connection.
Balanced
Tip
Ring
Tip
Ring
Sleeve
SLEEVE RING TIP
TIP RING SLEEVE
Sleeve
1
2
1
2
3
3
Tip
1
2
3
Ring
TIP RING SLEEVE
Sleeve
Unbalanced
Tip
1
2
3
Ring
Sleeve
TIP RING SLEEVE
Tip
1
2
3
Sleeve
TIP SLEEVE
1
2
3
Centre
Screen
Tip
Tip
TIP SLEEVE
SLEEVE TIP
Sleeve
Sleeve
Tip
Tip
Ring
Ring
TIP RING SLEEVE
SLEEVE RING TIP
Sleeve
Sleeve
Tip
Centre
Screen
Sleeve
TIP SLEEVE
Tip
Centre
Screen
Ring
Sleeve
TIP RING SLEEVE
1
2
1
2
3
3
14
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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.
AUX
AUX
(PRE)
POST
(PRE)
POST
Solder the PRE route
Disconnect
the POST route
Before
After
Modification on mono and stereo channels
15
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7. BLOCK DIAGRAMS
S E N D E F X
A U X - 1
S E N D E F X
A U X - 1
B U S R I G H T -
S U - B L E F T
B U S R I G H T -
S U - B L E F T
16
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8. TECHNICAL SPECIFICATION
Mono input channels
Microphone input
electronically balanced, discrete input configuration
10Hz to 55kHz, + 3dB
Frequency response
Distortion (THD & N)
Gain range
0.005% at +4dBu, 1kHz
0dB to 44dB (MIC)
SNR (Signal to Noise Ratio)
115dB
Line input
electronically balanced
10Hz to 55kHz, + 3dB
0.005% at +4dBu, 1kHz
+15dBu to 30dBu
Frequency response
Distortion (THD & N)
Sensitivity range
Stereo input channels
Impedances
Line input
Balanced
Frequency response
Distortion (THD & N)
10Hz to 55kHz,
3dB
+
0.005% at +4dBu, 1kHz
Microphone input
All other inputs
Tape out
1.4kOhm
10kOhm or greater
1kOhm
All other output
120Ohm
Equalization
Hi shelving
Mid bell
+
+
+
15dB @12kHz
12dB @2.5kHz
15dB @80Hz
Low shelving
Low Cut filter
75Hz, 18dB/oct.
Main Mix Section
Noise (Bus noise)
Fader 0 dB, channels muted: 100dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned and set to
UNITY gain: 90dBr (ref.:+4dBu)
+22dBu unbalanced, 1/4" jacks
Max output
AUX Sends max out
+22dBu
Power supply (AC/AC Adaptor)
Main voltage
USA/Canada
Europe
100 120V~, 60Hz
210 240V~, 50Hz
240V~, 50Hz
U.K./Australia
11 watts
Power Consumption
Dimension (W D H)
Physical
208mm 275.5mm 35/43mm
(6.06" 7.81" 1.01"/1.30")
1.65Kg (3.65lb)
Net weight
Shipping weight
2.3Kg (5.11lb)
17
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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 LTO warrants that this product will be free from any defects in materials 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, LTO 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 LTO be liable for any incidental or consequential damages. Some states do not allow the exclu-
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
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SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan
All rights reserved to ALTO. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of this
c
manual without written permission is forbidden. Copyright
2005 SEIKAKU GROUP
NF01656-1.4
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