User's Manual
S 6
6 CHANNEL MIXING CONSOLE
R
Version 2.0 Dec. 2002
English
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PREFACE
Dear Customer:
Thank you for choosing the LTO S-6 6-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 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 S-6 is an extremely flexible, ultra-low noise 6-channel console, which is the smallest among our range of
mixing consoles. It is configured with 2 mono and 2 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..
We would like to thank all the people who made the LTO S-6 6-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
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TABLE OF CONTENTS
1. INTRODUCTION..................................................................................................................................4
2. FEATURES...........................................................................................................................................4
3. READY TO START?.............................................................................................................................4
4. CONTROL ELEMENTS.......................................................................................................................5
4.1 The MIC/LINE channels
4.2 INPUT LEVEL setting
4.3 STEREO INPUT (CH3 ~ CH6)
4.4 The 3 BANDS EQUALISER
4.5 AUX
4.6 PAN
4.7 PEAK
4.8 LEVEL
4.9 MASTER section
4.10 REAR PANEL
5. INSTALLATION AND CONNECTION..................................................................................................11
6. FOR THE EXPERTS WHO WANT TO KNOW MORE..........................................................................13
7. SYSTEM BLOCK DIAGRAMS...........................................................................................................14
8. TECHNICAL SPECIFICATION.............................................................................................................15
9. WARRANTY..........................................................................................................................................16
3
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1. INTRODUCTION
Your S-6 is a 6-channel mixer and it is the smallest among our range of mixing consoles. Although, great performances
and sound quality is insured thanks to the specification of the components used and the building quality.
Your S-6 is packed with features in proportion with it size: 2 Mono (these are provided with Ultra Low Noise microphone
preamplifiers and Phantom Power at +48 Volts) and 2 stereo input channels are provided, and each of them is provided
with a 3 bands graphic equaliser for LOW, MID and HI controls, as well as 1 Auxiliary Bus. There is even a stereo
input available to be assigned directly to the main MIX or to the other outputs: Control Room and Headphone.
Your S-6 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-6.
2. FEATURES
Your S-6 Console Mixer is your ideal companion for use with keyboards, MIDI Equipment, small PA and Audio/Video
applications. The 2 track input assignable directly to the main MIX or the Control Room Output makes your S-6 also
suitable for recording an playback audio signals.
- 2 Input for Microphone provided with balanced 1/4" jack and XLR
- The Microphone preamplifiers are Ultra Low Noise and are provided with +48 Volts Phantom Power
- 2 Stereo input for Line level signal provided with balanced TRS 1/4" jacks
- Precise 3 bands graphic equaliser (LOW, MID and HI) on each input channel
- 1 Auxiliary send on all input channel to connect an external stage monitor loudspeaker or a sound processor
- Single Led indicating signal Peaks on each input channel
- 6 Segments Led Meter for optimum reading of the output signal
- Main Output and Control Room outputs are unbalanced type
- 2-track input featuring RCA sockets assignable alternatively to each output group
3. READY TO START?
3.1 There is a small black box provided with your S-6. This is the 18V AC Adapter. Connect the proper terminal into your
S-6 and the Adapter into an AC socket.
3.2 Be sure that the main power switch is turned off before connecting the AC Adapter. 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-6 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 AC Adapter always turn-off your S-6.
3.5 Do not use solvents to clean your S-6. A dry and clean cloth will be OK.
4
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4. CONTROL ELEMENTS
STEREO
AUX SENDS
CONTROL ROOM
OUTPUT
MIC 1
MIC 2
AUX RETURN
R
S-6
6-CHANNEL MIXING CONSOLE
2
1
2
1
3
3
LEFT(MONO)
PHONES
LEFT
RIGHT
RIGHT
BAL OR
UNBAL
BAL OR
UNBAL
2-TRACK IN/OUT
LINE IN 5/6
MAIN MIX OUTPUT
LINE IN 3/4
LINE IN 1
TRIM
LINE IN 2
TRIM
L
LEFT (MONO)
LEFT
LEFT(MONO)
R
+15dB -45dB LINE
+15dB -45dB LINE
0dB
60dB MIC
0dB
60dB MIC
RIGHT
RIGHT
RIGHT
TAPE IN TAPE OUT
EQ
EQ
EQ
EQ
HI
HI
HI
HI
12kHz
12kHz
12kHz
12kHz
-15
-12
-15
+15
+12
+15
-15
-12
-15
+15
+12
+15
-15
-12
-15
+15
+12
+15
-15
-12
-15
+15
0
0
0
0
MID
MID
MID
MID
2.5kHz
2.5kHz
2.5kHz
2.5kHz
PHANTOM PWR
+12
LOW
80Hz
LOW
80Hz
LOW
80Hz
LOW
80Hz
PHANTOM PWR
+15
-
+15
AUX RETURN
CLIP
10
AUX
AUX
AUX
AUX
POST
(PRE)
POST
(PRE)
POST
(PRE)
POST
(PRE)
0
-
+15
-
+15
-
+15
-
+15
-4
2TK TO
CONTROL ROOM
-10
-30
PAN
PAN
BAL
BAL
L
R
2TK TO MIX
OUTPUT LEVEL
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
PEAK
PEAK
PEAK
PEAK
-
+15
-
+15
-
+15
-
+15
-
MAX
-
+15
CONTROL
ROOM
LEVEL
LEVEL
LEVEL
LEVEL
PHONES /
MAIN MIX
LEVEL
1
2
3/4
5/6
5
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4.1 The MIC/LINE channels
1
These are Channel 1 and Channel 2. 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.
MIC 1
2
1
3
4.1.1 PHANTOM POWER +48 Volts
It is available only on the XLR input sockets.
1
BAL OR
UNBAL
4.2 INPUT LEVEL setting
2
LINE IN 1
TRIM
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 (0-60 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.
2
+15dB -45dB LINE
0dB 60dB MIC
4.3 STEREO INPUT (CH3~CH6)
3
LINE IN 5/6
LINE IN 3/4
Each stereo channel comes with two balanced line
level inputs on 1/4" TRS jacks, for left and right signals.
When only the left input is connected, the channel
operates in mono.
LEFT (MONO)
LEFT(MONO)
RIGHT
RIGHT
3
6
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4.3 The 3 BANDS EQUALISER
A 3-band equaliser is provided for all input channels with a wide range
of frequency adjustment.
EQ
4.4.1 HI
4
HI
12kHz
4
5
6
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.
-15
-12
-15
+15
+12
+15
0
MID
2.5kHz
4.4.2 MID
5
This is the midrange control. It can affect most fundamental frequ
-encies of all musical instruments and human voice. An attentive
use of this control will give you and very wide panorama of sound
effects. The gain range goes from -12dB to +12dB and the center
frequency is 2.5 kHz.
LOW
80Hz
4.4.3 LOW
6
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.
4.5 AUX
7
This control will send the audio signal to the Auxiliary Bus. The configura-
tion is post-fader so the level sent to the AUX bus will be affected by the
Main Level Control of that particular channel.
Note: There is the possibility to configure this AUX Send as Pre-fader
as we will explain later in this Manual.
AUX
POST
(PRE)
7
8
4.6 PAN
8
-
+15
This is the PANORAMA control, or balance control. 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.
PAN
LEFT
RIGHT
Of course a wide number of intermediate positions is available.
9
PEAK
4.7 PEAK
9
10
Inside your S-6 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.
-
+15
LEVEL
1
4.8 LEVEL
10
This Control will adjust the overall level of this channel and set the amount
of signal sent to the Main output.
7
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4.9 MASTER section
- MAIN MIX LEVEL
11
This Control sets the amount of signal sent either
to the Main Out socket or to the Tape Output.
- PHONES/CONTROL ROOM
12
This Control sets the amount of signal sent to the
Control Room and headphone.
16
15
PHANTOM PWR
- LED METER
13
17
18
PHANTOM PWR
This stereo 6 segments Led Meter will indicate
the level of the overall output signal.
-
+15
AUX RETURN
CLIP
10
- 2 TRACK signal path
14
0
If you push down the 2TK TO CONTROL ROOM
button, the 2 TRACK IN signal will be routed into
the Control Room output and the level will be ad-
justed by the Control Room knob nearby the Main
MIX LEVEL knob.
13
-4
2TK TO
CONTROL ROOM
14
-10
-30
L
R
2TK TO MIX
OUTPUT LEVEL
If you push down the 2TR TO MIX button, the
2 TRACK IN signal will be routed into the MAIN
output and will be adjusted by the MAIN MIX
LEVEL knob.
-
MAX
-
+15
CONTROL
ROOM
PHONES /
MAIN MIX
LEVEL
- AUX RETURN
15
It will be used to return the signal of an effect
processor into the mixer but it can be also used
as an additional stereo line input. This signal of
the AUX RETURN is always assigned to the MAIN
MIX. The Aux Return input will operate in mono
if you connect an input only to the left socket.
12
11
- PHANTOM PWR
16
This switch will apply +48 Volt Phantom Power
only to the 2 XLR microphone inputs. Never con
-nect microphones when the Phantom Power is
on already.
- PHANTOM
17
This LED indicates when the Phantom Power is
switched on.
- PWR
18
This Led indicates when the Power is on in your
S-6.
8
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- MAIN MIX OUTPUT
19
This stereo output is controlled by the Main Mix
Level on the front panel and will send the audio
signal to an amplifier. The output level can be
varied from - to +15dB.
20
2-TRACK IN/OUT
MAIN MIX OUTPUT
L
- 2-TRACK IN/OUT
Input
20
LEFT
R
Use the Tape input if you wish to listen to your
Mix from a Taper Recorder or DAT, You can
the signal coming form 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.
RIGHT
TAPE IN TAPE OUT
19
Output
These 1/4" TRS sockets will route the main mix into a tape recorder.
STEREO
AUX SENDS
CONTROL ROOM
OUTPUT
AUX RETURN
R
S-6
6-CHANNEL MIXING CONSOLE
LEFT(MONO)
PHONES
LEFT
RIGHT
RIGHT
21
24
22 23
21
- STEREO AUX RETURN
Use these stereo 1/4" phone socket to return the sound of an effect unit or sound processor to the Main Mix.
Alternatively you can use them as an extra auxiliary input.
22
- AUX SENDS
This 1/4" phone socket is used to send out the signal from the AUX Bus to external devices such as effects and
sound processors.
23
- PHONES
This socket will send out the signal mix to a pair of headphones.
24
- CONTROL ROOM OUTPUT
These 1/4" phone sockets will be used to send the signal to Studio Monitor speakers or to a second set of PA.
9
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4.10 REAR PANEL
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
OFF
POWER
18VAC~
RATED POWER CONSUMPTION: 11W
25
26
- POWER
This switch is used to turn the Main Power ON and OFF.
25
26
- 18VAC
Used to connect the supplied AC Adapter.
10
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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 S-6. 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 S-6 set the Level of the amplifier at no more than 70%
- Now, set the CONTROL ROOM/PHONE 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 middle position
- Position panoramic (PAN) control on center position.
- 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 clock-
wise 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.
11
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b. Some Final Tips on Wiring Configuration
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow these schematics.
Ring=Right Signal
Tip
Sleeve
Ring
Strain Clamp
Tip=Left Signal
Sleeve=Ground/Screen
Use for Headphone, Stereo Return
1/4" Stereo (TRS) Jack Plug
Tip
Sleeve
Tip=Signal
Strain Clamp
Sleeve=Ground/Screen
Use for Mono Line In, Mono 1/4"Jack Plugs
1/4" Mono (TS) Jack Plug
2
2
1
1
2=Hot(+)
2=Hot(+)
1=Ground/Screen
1=Ground/Screen
3
3
3=Cold(-)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
3=Cold(-)
Use for Main output
(For unbalanced use, leave pin 3 unconnected)
3-pin XLR Male Plug
(seen from soldering side)
3-pin XLR Line Socket
(seen from soldering side)
12
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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 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
13
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7. SYSTEM BLOCK DIAGRAMS
A U X
B U S G H R T I -
B U S L E F T -
14
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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 60dB(MIC)
SNR (Signal to Noise Ratio)
Line input
115dB
electronically balanced
10Hz to 55kHz, +/ 3dB
Frequency response
Distortion (THD&N)
Sensitivity range
0.005% at +4dBu, 1kHz
+15dBu to 45dBu
Stereo input channels
Impedances
Line input
balanced
10Hz to 55kHz,
Frequency response
Distortion (THD&N)
3dB
+/
0.005% at +4dBu, 1kHz
Microphone input
Channel Insert return
All other inputs
Tape out
1.4Kohm
2.5Kohm
10Kohm or greater
1Kohm
All other output
120ohm
Equalization
Hi shelving
Mid bell
+/ 15dB @12kHz
+/ 12dB @2.5kHz
+/ 15dB @80Hz
Low shelving
Main Mix Section
Noise (Bus noise)
Fader 0 dB, channels muted: 100.0dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned
and set to UNITY gain: 90dBr (ref.:+4dBu)
+22dBu unbalanced, 1/4" jacks
Max output
AUX Return gain range
AUX Sends max out
-
to +15dB
+22dBu
Power supply (AC/AC Adaptor)
Type
Linear, External
18VAC
Input
Power
11Watts
Transformer
External Wall Mount
Physical
Dimension (W
Net weight
D
H)
171mm 224mm 34/40mm (6.73" 8.82" 1.18"/1.57")
1.33Kg (2.93lb) Without Adaptor
15
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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.
16
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SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan
All rights reserved to ALTO Mobile. Due to continued development in response to
customer feedback, product features, specifications and/or internal/external design may be
changed without prior notice. No photocopying, translation or reproduction of any part of this user
c
manual is allowed without prior written permission.Copyright 2004 Seikaku Technical Group Limited.
NF01090-1.0
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