User's Manual
8-CHANNEL MIXING CONSOLE
L-8
WITH DIGITAL EFFECTS
R
LTO
www.altoproaudio.com
Version 1.2 August 2004
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.
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.
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.
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.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
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.
Fuse
To prevent fire and damage to the product, use only
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:
Thanks for choosing LTO L-8 8-Channel Mixing Console With Digital Effects and thanks for choosing one of the results
of LTO AUDIO TEAM's work and researches.
For our LTO AUDIO TEAM, music and sound more than a job... are first of all passion and let us say... our
We have been designing professional audio products for a long time in cooperation with some of the major brands
in the world in the audio field.
The LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R&D centers in Italy, Netherlands, United Kingdom and a large range of state of the art algorithms which have been developed
by our Software Team for the last 7 years.
Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming the quality
of our job, we like to share with you our work and our dreams paying attention to your suggestions and your comments.
Following this idea we create our products and we will create the new ones! From our side, we guarantee you and we
will guarantee you also in future the best quality, the best fruits of our continuous researches and the best prices.
Our LTO L-8 8-Channel Mixing Console with Digital Effects has 4 mono (these are provided with Ultra Low Noise microphone
preamplifiers and Phantom Power at +48 Volt) and 2 stereo input channels, and each of them is provided witha3bands
graphic equliser for HI, MID and LOW controls. It is specifically designed for professional appliance.
To our surprise, it provides 24 bits digital stereo effect processor with 256 presets and small and exquisite modeling.
Seeing is believing, let's meet the LTO L-8.
Nothing else to add, but we would like to thank all the people that made the LTO L-8 8-Channel Mixing Console with
Digital Effects a reality available to our customers, and thank our designers and all the LTO staff, people who make
possible the realization of products containing our idea of music and sound and are ready to support you, our customers,
in the best way, conscious that you are our most important member.
obsession!
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 LOW-CUT FILTER........................................................................................................................................8
4.4 STEREO INPUTS........................................................................................................................................9
4.5 The 3 BANDS EQUALISER..........................................................................................................................9
4.6 AUX SEND..................................................................................................................................................10
4.7 PAN............................................................................................................................................................10
4.8 PEAK..........................................................................................................................................................10
4.9 LEVEL.........................................................................................................................................................10
4.10 INSERT.......................................................................................................................................................10
4.11 MASTER SECTION ...................................................................................................................................11
-MAIN MIX LEVEL
-LED METER
-2 TRACK signal path
-AUX RETURN
-POWER LED
-PHANTOM LED
-PHONES/CONTROL ROOM
-24 BIT DIGITAL EFFECTS
-DFX FOOTSWITCH
-PHONES
-STEREO AUX RETURN
-AUX SEND 1 AND 2
-2-TRACK IN/OUT
4.12 REAR PANEL .............................................................................................................................................13
-POWER
-PHANTOM
-AC INLET WITH FUSE HOLDER
-MAIN MIX OUTPUT
-CONTROL ROOM OUTPUT
5.INSTALLATION AND CONNECTION.....................................................................................................................14
6.FOR THE EXPERTS WHO WANT TO KNOW MORE..........................................................................................17
7. PRESET LIST........................................................................................................................................................18
8.SYSTEM BLOCK DIAGRAMS.............................................................................................................................25
9.TECHNICAL SPECIFICATION..............................................................................................................................26
10.WARRANTY.........................................................................................................................................................28
3
1. INTRODUCTION
Thank you very much for expressing your confidence in products by purchasing L-8 8 Channel MixingLTO LTO
Console with Digital Effects. The L-8 8 Channel Mixing Console with Digital Effects 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 L-8 8 Channel Mixing Console with Digital Effects is packed with feature 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 2 stereo input channels, and each of them is provided with a 3 bands graphic equaliser for HI, MID and LOW
controls; 24 bit effects processor; 256 effects (16 presets 16 variations); 2 AUX sends with separate level control on each
channel; highly accurate 12-segment bar graph meters and ultra low noise discrete MIC pre-amps with +48V Phantom
power and 2-Track inputs assignable to main mix, control room / headphone outputs.
Your L-8 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-8.
4
2. FEATURES
The L-8 8 Channel Mixing Console with Digital Effects is designed for professional appliance. It will provide the following
features:
5 MIC input channels with gold plated XLRs and balanced LINE input
2 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
Balanced inputs for highest signal integrity
Warm, natural 3-band EQ on each channel
24 bit digital effects processor
256 effects (16 presets 16 variations)
Effect on/off by means of MUTE switch or a footswitch connected to the DFX FOOTSWITCH
Switch-able Low-cut filter on each mono channel
Peak LED on each channel
AUX send 2 switch-able to PRE/POST fader
AUX send 1/2 per channel for external effects and monitoring
Control room and headphone outputs
2-Track inputs assignable to main mix, control room / headphone outputs
Highly accurate 12-segment bar graph meters
Inserts on MIC channels
5
3. READY TO START?
3.1 Please check the AC Voltage available in your Country before connecting your L-8 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-8 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-8 always turn-off the Power switch.
3.5 Do not use solvents to clean your L-8. A dry and clean cloth will be OK.
6
4. CONTROL ELEMENTS
MIC 1
3
LINE IN 1
TRIM
+15dB -45dB LINE
0dB 60dB MIC
0
+15+15-15-15
0
+12-12
0
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
MIC 2 MIC 3 MIC 4
12
BAL OR
UNBAL
LOW CUT
75Hz
18dB/Oct
EQ
HI
12kHz
MID MID MID MID MID MID
2.5kHz
LOW
80Hz
AUX
1
PRE PRE PRE PRE PRE PRE
2
/
POST
D
(PRE)
F
X
PAN
PEAK
12
3
BAL OR
UNBAL
LINE IN 2
TRIM
+15dB -45dB LINE
0dB 60dB MIC
LOW CUT
18dB/Oct
0
+15+15-15-15
0
2.5kHz
+12-12
0
+15+15-15-15
0
AUX
8
-+15
0
8
-+15
PAN
LEFT
RIGHT
0
75Hz
EQ
HI
12kHz
LOW
80Hz
POST
(PRE)
PEAK
3
LINE IN 3
TRIM
+15dB -45dB LINE
0dB 60dB MIC
0
+15+15-15-15
0
+12-12
0
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
12
BAL OR
UNBAL
LOW CUT
75Hz
18dB/Oct
EQ
HI
12kHz
2.5kHz
LOW
80Hz
AUX
POST
(PRE)
PAN
PEAK
3
LINE IN 4
TRIM
+15dB -45dB LINE
0dB 60dB MIC
0
+15+15-15-15
0
+12-12
0
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
STEREO AUX RETURN AUX SEND
LEFT(MONO)
1
12
BAL OR
UNBAL
LEFT
3
MIC (MONO)
2
12
TRIM
LOW CUT
75Hz
18dB/Oct
2.5kHz
AUX
PAN
EQ
HI
12kHz
LOW
80Hz
POST
(PRE)
PEAK
0dB 60dB MIC
0
0
0
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
EQ
12kHz
+15+15-15-15
2.5kHz
+12-12
LOW
80Hz
+15+15-15-15
AUX
POST
(PRE)
BAL
PEAK
RIGHT
RIGHT
1
2
LINE IN 5/6 LINE IN 7/8
LEFT (MONO)
RIGHT RIGHT
0
HI
+15+15-15-15
0
+12-12
0
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
LEFT (MONO)
EQ
HI
12kHz
2.5kHz
LOW
80Hz
AUX
POST
(PRE)
BAL
PEAK
2-TRACK IN/OUT
L
R
TAPE IN TAPE OUT
DFX
FOOTSWITCH
PHONES
1
16
2
3
15
14
13
12
11
7
8
10
9
1
16
2
3
15
14
13
12
11
7
8
10
9
0
8
-+15
AUX2/DFX TO AUX 1
0
8
-+15
AUX RTN 1
0
8
-+15
AUX RTN 2
(DFX)
LTO
8-CHANNEL MIXING CONSOLE
WITH
DIGITAL EFFECTS
1. VOCAL 1
2. VOCAL 2
PRESETS
POWER
PHANTOM
3. LARGE HALL
4. SMALL HALL
5. LARGE ROOM
6. SMALL ROOM
7. PLATE
8. TAPE REVERB
9. SPRING REVERB
10. MONO DELAY
11. STEREO DELAY
12. FLANGER
13. CHORUS
14. REVERB + DELAY
15. FLANGERREVERB +
16. REVERB + CHORUS
DFX MUTE
PEAK
CLIP
LR
10
7
4
4
5
6
4
5
6
VARIATIONS
2
0
-2
-4
2TK TO
MIX
-7
-10
-20
OUTPUT
-30
0
2TK TO
CTRL ROOM
R
LEVEL
L-8
8
-+15
LEVEL
1
8
-+15
LEVEL
2
8
-+15
LEVEL
3
8
-+15
LEVEL
4 5/6
8
-+15
LEVEL
7
8
-+15
LEVEL
7/8
-
PHONES /
8
MAX
CONTROL
ROOM
8
-+15
MAIN MIX LEVEL
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
12
3
BAL OR
UNBAL
LINE IN 1
TRIM
+15dB -45dB LINE
0dB 60dB MIC
LOW CUT
75Hz
18dB/Oct
1
2
3
4.3 LOW-CUT FILTER
POWER
ON
OFF
3
PHANTOM
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
4.4 STEREO INPUTS
5
These are Channel 5 through 8. They are organised
in stereo pair and they are provided with 1/4" TRS
phone sockets.
If you connect only the left jack, the input will operate
in mono mode.
4.5 The 3 BANDS EQUALISER
A 3-band equaliser is provided for all input channels with a wide
range of frequency adjustment.
4.5.1 HI
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.
12
3
MIC (MONO)
TRIM
0dB 60dB MIC
LINE IN 5/6 LINE IN 7/8
LEFT (MONO)
RIGHT RIGHT
LEFT (MONO)
0
EQ
HI
12kHz
+15+15-15-15
0
MID
2.5kHz
+12-12
0
5
6
7
4.5.2 MID
7
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.
4.5.3 LOW
8
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.
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
LEFT
RIGHT
0
8
-+15
LEVEL
LOW
80Hz
AUX
PRE
POST
(PRE)
PAN
PEAK
8
9
4.6 AUX SEND
9
These two controls are used to adjust the level of the signal sent to AUX
buses, and their adjustable range goes from - to +15dB.
AUX1 is configured as PRE-FADER, so, generally, it can be used for
monitor application.
While AUX2 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.)
In this typical compact unit, excluding sending out directly to the external
effect or processor equipment, AUX SEND2 will also be sent to the
internal onboard effect module.
4.7 PAN
10
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. Of course a wide
number of intermediate positions is available.
0
+15+15-15-15
0
+12-12
0
+15+15-15-15
0
1
8
-+15
0
2
/
D
F
X
8
-+15
EQ
HI
12kHz
MID
2.5kHz
LOW
80Hz
AUX
PRE
POST
(PRE)
PAN
9
4.8 PEAK
11
Inside your L-8 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.
4.9 LEVEL
12
This Control will adjust the overall level of this channel and set the
amount of signal sent to the Main output.
4.10 INSERT
13
Insert points are provided for the Mono Mic Channels. When you
insert a jack in the insert socket, the signal will be taken out after the
Input Gain Control (Trim), sent to an external processor such a compressor-limiter, and returned into the channel strip immediately before
the EQ section. Of course, the jacks used must be stereo (Tip Send/
Ring Return).
LEFT
RIGHT
0
PEAK
8
-+15
LEVEL
10
11
12
CHANNEL INSERT
(P -FADER/PRE-EQ TIP SEND/RING RETURN)RE
CH4 CH3 CH2 CH1
13
10
4.11 MASTER SECTION
- MAIN MIX LEVEL
14
This Control sets the amount of signal sent either to the Main Out socket or to the Tape Output.
- LED METER
15
This stereo 12 segments Led Meter will indicate the level of the overall output signal.
- 2 TRACK signal path
16
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
19 20
be adjusted by the Control Room knob nearby
the Main MIX LEVEL knob.
If you push 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.
- AUX RETURN
17
As implied in the name, the Auxiliary Returns are
used to 'return' the signal from the external effects
or processors to the main mix, but, most of the
18
17
0
8
-+15
AUX2/DFX TO AUX 1
0
8
-+15
AUX RTN 1
0
POWER
PHANTOM
2TK TO
MIX
LR
times, it can also be worked as the additional
stereo line inputs.
In this typical compact unit:
8
-+15
AUX RTN 2
(DFX)
2TK TO
CTRL ROOM
OUTPUT
AUX RETURN1 is configured to be assigned to
the main mix bus permanently, for mono application,
only use the left input jack.
But for AUX RETURN2, instead of assigning the
PHONES /
8
-
MAX
CONTROL
ROOM
-+15
MAIN MIX LEVEL
returned signal to main mix bus, it can also to AUX1
bus, and in this case, adjust AUX2/DFX TO AUX1
knob (18) to control the input level.
Normally, AUX RETURN2 is connected rightly
21
16
with the output of the internal digital effects, but,
this signal flow will be broken, if you have any
external signal inserted from these two jacks.
CLIP
10
7
4
2
0
-2
-4
-7
-10
-20
-30
0
8
14
15
LEVEL
- POWER LED
19
This LED indicates when the Power is on in your L-8.
- PHANTOM LED
20
This LED indicates when the Phantom Power is switched on.
- PHONES/CONTROL ROOM
21
This Control sets the amount of signal sent to the Control Room and headphone.
11
- 24 BIT DIGITAL EFFECTS
PRESETS
22
Adjust this knob to select the right effect you wish
to perform. There are total 16 options for you: several
kinds of reverb, mono and stereo delay, effects with
22
1
16
2
15
14
13
12
11
10
3
4
5
6
7
8
9
PRESETS
modulation, and versatile two-effect combination.
1
16
2
9
3
7
8
4
5
6
VARIATIONS
VARIATIONS
23
Since you have selected the preferable effect, the next
step, please go with the fine consideration, there are
23
15
14
13
12
11
10
also total 16 variations for each preset, Each variation
may be managed by several different factors.
MUTE SWITCH
24
This switch is used to activate/deactivate the effect facility.
Sometimes, you can also use the DFX FOOTSWITCH for convenient operation.
PEAK LED
25
This LED lights up when the input signal is too strong.
In case of the digital effect module being muted, this LED also lights up.
1. VOCAL 1
2. VOCAL 2
3. LARGE HALL
4. SMALL HALL
5. LARGE ROOM
6. SMALL ROOM
7. PLATE
8. TAPE REVERB
9. SPRING REVERB
10. MONO DELAY
11. STEREO DELAY
12. FLANGER
13. CHORUS
14. REVERB + DELAY
15. FLANGERREVERB +
16. REVERB + CHORUS
DFX MUTE
PEAK
24 25
- DFX FOOTSWITCH
26
This 1/4" phone jack can be used to connect an
external footswitch to turn on/off the onboard effect
module.
- PHONES
27
This socket will send out the mix signal to a pair of
headphones.
- STEREO AUX RETURN
28
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.
- AUX SEND
29
These 1/4" phone sockets are used to send out the
signal from the AUX Bus to external devices such as
effects and sound processors.
FOOTSWITCH
26
27
STEREO AUX RETURN AUX SEND
LEFT(MONO)
LEFT
RIGHT
1
RIGHT
2
1
2
DFX
PHONES
2-TRACK IN/OUT
L
R
TAPE IN TAPE OUT
12
28
29
30
- 2-TRACK IN/OUT
30
Input
Use the Tape input if you wish to listen to your Mix from a Taper Recorder or DAT, you can assign the signal coming
form the Taper Recorder either to a pair of studio monitor using the Control Room assignment on the front panel or
directly to the Main Mix.
Output
These 1/4" TRS sockets will route the main mix into a tape recorder.
4.12 REAR PANEL DESCRIPTION
- POWER
31
POWER
ON
OFF
32 33
31
4
PHANTOM
Use only with a 250V fuse
Use only with a 250V fuse
Use only with a 250V fuse
AC INPUT
EUROPE
210-240V 50Hz
RATED POWER CONSUMPTION: 25W
USA / Canada
100-120V 60Hz
Fuse:T500mAL
Fuse:T250mAL
CAUTION:
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
RIGHT LEFT
UK / Aust
240V 50Hz
Fuse:T250mAL
This switch is used to turn the Main Power ON and OFF.
12
3
WARNING: SHOCK HAZARD
AVIS: RISQUE DE CHOC ELECTRIQUE
MAIN MIX OUTPUT
(BAL/UNBAL)
3
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
- DO NOT OPEN
- NE PAS OUVRIR
CONTROL
ROOM OUTPUT
12
LEFT
LEFT
RIGHTRIGHT
34
- PHANTOM
4
This switch will apply +48 Volt Phantom Power only to the 5 XLR microphone inputs. Never connect microphones
when the Phantom Power is on already.
- AC INLET WITH FUSE HOLDER
32
Use it to connect your L-8 to the Main AC with the supplied AC cord. Please check the Voltage available in your
Country and make sure the Voltage for your L-8 before attempting to connect your L-8 to the Main AC.
- MAIN MIX OUTPUT
33
This stereo output is supplied both with XLR and 1/4" jack socket and it is controlled by the Main Mix Level on
the front panel. It will send the audio signal to an amplifier. The output level can be varied from - to +15dB.
- CONTROL ROOM OUTPUT
34
These 1/4" phone sockets will be used to send the signal to Studio Monitor speakers or to a second set of PA.
13
5. INSTALLATION AND CONNECTION
Ok, you have got to this point you are now in the position to successfully operate your L-8. 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 L-8 set the Level of the amplifier at no more than 70%.
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.
14
5.1 SOME FINAL TIPS ON WIRING CONFIGURATION
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow these schematics.
Strain Clamp
Strain Clamp
Sleeve
Tip
Ring
Sleeve=Ground/Screen
Use for Headphone, Stereo Return
Ring=Right Signal
1/4" Stereo (TRS) Jack Plug
Sleeve
Use for Mono Line In, Mono 1/4"Jack Plugs
Tip
Sleeve=Ground/Screen
1/4" Mono (TS) Jack Plug
Tip=Left Signal
Tip=Signal
Sleeve
Strain Clamp
1/4" Stereo (TRS) Jack Plug
2
2=Hot(+)
3=Cold(-)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
1
3
1=Ground/Screen
Tip
Ring
Sleeve=Ground/Screen
Use for Pre-Gain Channel Inserts
Ring=Return Signal
2=Hot(+)
(For unbalanced use, leave pin 3 unconnected)
Tip=Send Signal
2
1
3
3=Cold(-)
Use for Main output
1=Ground/Screen
3-pin XLR Male Plug
(seen from soldering side)
3-pin XLR Line Socket
(seen from soldering side)
15
Ring=Return Signal (Connected together)
To Channel Insert
Sleeve=Ground/Screen
Tip=Signal
To Tape or FX Input
Sleeve=Ground/Screen
'Tapped' Connection Direct Output Lead
(Enables the Insert to be used as a Direct Output
while maintaining the channel signal flow)
To Processor Input
Sleeve=Ground/Screen
Tip
Tip=Send Signal
To Channel Insert
Sleeve
Ring
Ring=Return Signal
To Processor Output
-Stereo lead for insert Connection
(To be used when the processor does not employ a
single jack connection for the In/Out Connections)
16
6. FOR THE EXPERTS WHO WANT TO KNOW MORE
As we have told you previously in this Manual, the Aux Send 2 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
17
7. PRESET LIST
01. VOCAL1
02. VOCAL2
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pre-delay
84 1.00
30
0 4.50 10
55
10 1.20 9
79
45
45
25
0
45
114
40
50
45
55
Pre-delay
114
45
79
10
55
0
30
84
55
45
50
40
114
45
0
25
Rev Time
1.00 8
3.60
3.60
0.8
1.50
2.40
0.90
1.50
1.00
1.00
2.10
4.50
1.70
Rev Time
1.00
0.80
3.60
1.20
3.60
4.50
1.00
1.00
1.70
4.50
2.10
1.00
1.00
1.50
0.90
2.40
Room Size
39
11
8
41
41
9
41
10
45
9
10
11
Room Size
10
41
8
9
11
10
8
39
11
41
9
45
10
41
41
9
Rev. Type
Hall
Tape
Spring
Plate
Spring
Hall
Plate
Plate
Spring
Tape
Plate
Hall
Spring
Tape
Plate
Plate
Rev. Type
Spring
Plate
Hall
Spring
Plate
Spring
Tape
Hall
Plate
Plate
Tape
Spring
Hall
Plate
Tape
Spring
Hi Damp
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
Hi Damp
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
-12
03. LARGE HALL
No
1
2
3
4
5
6
7
8
Pre-delay
55
55
40
40
50
50
27
27
Rev Time
5.40
5.40
5.40
5.40
4.50
4.50
4.50
4.50
18
Room Size
45
45
35
35
43
43
33
33
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Rev level
79
79
78
78
82
82
82
82
9
10
11
12
13
14
15
16
04. SMALL HALL
50
50
27
27
45
45
23
23
4.00
4.00
4.00
4.00
3.60
3.60
3.60
3.60
42
42
32
32
41
41
30
30
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
82
82
82
82
88
88
88
88
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
05. LARGE ROOM
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pre-delay
45
45
23
23
40
40
20
20
40
40
20
20
40
40
20
20
Pre-delay
55
55
40
40
50
50
27
27
50
50
27
27
45
45
23
23
Rev Time
2.90
2.90
2.90
2.90
2.10
2.10
2.10
2.10
1.50
1.50
1.50
1.50
1.00
1.00
1.00
1.00
Rev Time
4.50
4.50
4.50
4.50
4.00
4.00
4.00
4.00
3.60
3.60
3.60
3.60
2.90
2.90
2.90
2.90
Room Size
39
39
28
28
38
38
27
27
37
37
26
26
36
36
25
25
Room Size
20
20
11
11
19
19
11
11
18
18
10
10
18
18
10
10
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Rev level
92
92
92
92
100
100
100
100
100
100
100
100
100
100
100
100
Rev level
82
82
82
82
82
82
82
82
88
88
88
88
88
88
88
88
19
06. SMALL ROOM
07. PLATE
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pre-delay
45
45
23
23
40
40
20
20
40
40
20
20
40
40
20
20
Pre-delay
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Rev Time
2.10
2.10
2.10
2.10
1.50
1.50
1.50
1.50
1.00
1.00
1.00
1.00
0.70
0.70
0.70
0.70
Rev Time
6.10
5.40
4.50
4.00
3.60
2.90
2.40
2.10
1.70
1.50
1.30
1.20
1.00
0.80
0.70
0.60
Room Size
17
17
9
9
17
17
9
9
16
16
8
8
16
16
8
8
Room Size
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Hi Damp
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
-2.08
Rev level
92
92
92
92
100
100
100
100
100
100
100
100
100
100
100
100
08. TAPE REVERB
No
1
2
3
4
5
6
7
8
Pre-delay
84
84
84
84
84
84
84
84
Rev Time
5.4
5.4
4.50
4.50
4
4
3.60
3.60
20
Room Size
38
38
35
35
31
31
28
28
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Rev level
79
79
79
79
84
84
84
84
9
10
11
12
13
14
15
16
09. SPRING REVERB
0
0
0
0
0
0
0
0
3.60
3.60
2.90
2.90
2.10
2.10
1.30
1.30
23
23
23
23
21
21
21
21
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
92
92
92
92
100
100
100
100
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
10. MONO DELAY
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pre-delay
35
35
30
30
30
30
30
84
0
0
0
0
0
0
0
0
Delay
650
625
600
577
555
535
517
500
484
461
448
434
350
250
100
60
Rev Time
5.4
5.4
4.50
4.50
4
4
3.60
3.60
2.90
2.90
2.40
2.40
1.70
1.70
1.30
1.30
F.B.
60
60
60
60
60
60
60
60
60
60
60
60
60
65
0
0
Room Size
35
35
33
33
30
30
28
28
22
22
22
22
22
22
22
22
Hi Damp
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
-0.96
-12.00
Rev level
79
79
79
79
87
87
87
87
92
92
100
100
100
100
100
100
21
11. STEREO DELAY
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
12. FLANGER
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Delay
400
375
352
326
312
300
288
277
267
258
250
241
238
230
222
214
Mod. Freq
2.79
2.52
2.33
2.25
2.10
1.99
1.75
1.61
1.34
1.22
1.00
0.80
0.65
0.54
0.42
0.16
Right Delay
200
187
176
163
156
150
144
138
133
129
125
120
119
115
111
107
Pitch. Depth
30
40
40
40
40
40
40
50
50
70
70
70
70
70
70
70
Left F.B.
51
51
40
40
40
40
40
40
30
38
37
36
36
37
38
37
Left F.B.
38
42
38
38
42
38
42
38
42
58
62
62
58
68
68
68
Right F.B.
72
72
72
72
72
72
66
66
66
73
73
73
73
74
73
73
Right F.B.
42
38
42
42
38
42
38
42
38
62
58
58
62
72
72
72
13. CHORUS
No
1
2
3
4
5
6
7
8
9
10
Mod. Freq.
5.00
4.74
4.39
4.12
3.90
3.67
3.32
3.02
2.87
2.63
Pitch. Depth
15
15
15
15
30
30
30
30
30
40
22
IHFR
-3(0)
-4(0)
-4(0)
-4(0)
-4(0)
-4(0)
-4(0)
-4(0)
-4(0)
-4(0)
11
12
13
14
15
16
14. REVERB+DELAY
2.33
1.99
1.70
1.35
1.00
0.50
40
40
40
40
70
70
-3(0)
-3(0)
-3(0)
-2(0)
-2(0)
-2(0)
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Rev Time
2.90
2.90
2.90
2.90
2.40
2.40
2.40
2.40
2.10
2.10
1.50
1.50
1.50
1.50
1.00
1.00
15. REVERB+FLANGER
No
Rev Time
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2.90
2.90
2.90
2.90
2.90
2.90
2.90
2.90
1.50
1.50
1.50
1.50
1.50
1.50
1.00
1.00
Room Size
39
39
39
39
39
39
39
39
26
26
26
26
26
26
26
26
Room Size
39
39
39
39
39
39
39
39
26
26
26
26
26
26
26
26
Left Delay
375
326
300
277
258
241
230
211
375
326
300
277
258
241
230
211
Mod. Freq.
Right Delay
2.52
2.25
1.99
1.61
1.22
0.80
0.54
0.16
2.52
2.25
1.99
1.61
1.22
0.80
0.54
0.16
187
163
150
138
129
120
115
107
187
163
150
138
129
120
115
107
Pitch. Depth
Left F.B.
40
40
40
50
70
70
70
70
40
40
40
50
70
70
70
70
48
28
28
28
28
28
28
28
48
28
28
28
28
28
28
28
Right F.B.
82
67
67
67
60
49
49
49
82
67
67
67
60
49
49
49
Left F.B.
40
40
40
40
60
60
70
70
40
40
40
40
60
60
70
70
Rev level
80%
80%
80%
80%
80%
80%
80%
80%
90%
90%
90%
90%
90%
90%
90%
90%
Rev level
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
23
16. REVERB+CHORUS
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Rev Time
2.90
2.90
2.90
2.90
2.90
2.90
2.90
2.90
1.50
1.50
1.50
1.50
1.50
1.50
1.00
1.00
Room Size
39
39
39
39
39
39
39
39
26
26
26
26
26
26
26
26
Mod. Freq.
4.74
4.12
3.67
3.02
2.63
1.99
1.35
0.50
4.74
4.12
3.67
3.02
2.63
1.99
1.35
0.50
Pitch. Depth
40
40
40
40
40
40
70
70
40
40
40
40
40
40
70
70
Left F.B.
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
Rev level
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
90%
24
8. SYSTEM BLOCK DIAGRAMS
25
9. TECHNICAL SPECIFICATION
Mono input channels
Microphone input electronically balanced, discrete input configuration
Frequency response 10Hz to 55kHz, + 3dB
Distortion (THD & N) 0.005% at +4dBu, 1kHz
Gain range 0dB to 60dB (MIC)
SNR (Signal to Noise Ratio) 115dB
Line input electronically balanced
Frequency response 10Hz to 55kHz, + 3dB
Distortion (THD & N) 0.005% at +4dBu, 1kHz
Sensitivity range + to 45dBu
Stereo input channels
Line input unbalanced
Frequency response 10Hz to 55kHz,
Distortion (THD & N) 0.005% at +4dBu, 1kHz
Impedances
Microphone input 1.4kOhm
Channel Insert return 2.5kOhm
All other inputs 10kOhm or greater
Tape out 1kOhm
All other output 120Ohm
15dBu
3dB
+
Equalization
Hi shelving + @12kHz15dB
Mid bell + @2.5kHz
Low shelving + @80Hz
Low Cut filter 75Hz, 18dB/oct.
12dB
15dB
DSP SECTION
A/D and D/A converters 24 bit
DSP resolution 24 bit
Type of effects Hall, Room, Vocal & Plate REVERBS
Mono & Stereo DELAY (max DELAY TIME 650ms)
Chorus, Flanger & Reverb MODULATIONS
REVERB+DELAY, REVERB+CHORUS, REVERB+FLANGER combinations
Presets 256
Controls 16-position PRESET Selector
16-position VARIATION selector
CLIP LED
MUTE SWITCH with LED indicator
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)
Max output + balanced XLR,22dBu
22dBu unbalanced, 1/4" jacks+
AUX Return gain range OFF to +15dB
AUX Sends max out +22dBu
26
Power supply
Main voltage USA/Canada 100 120V~, 60Hz
Europe 210 240V~, 50Hz
U.K./Australia 240V~, 50Hz
Power Consumption 25 watts
Fuse 100 120V~ : T500mAL
210 240V~ : T250mAL
Main connection Standard IEC receptacle
Physical
Dimension (W D H) 245mm 268mm 24/73mm (9.64" 10.54" 0.94"/2.87")
Net weight 3.0Kg (6.62lb)
Shipping weight 4.1Kg (9.04lb)
27
10. 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.
28
SEKAKU ELECTRON INDUSTRY (H.K.) CO. LTD.
No.1, Lane 17, Sec. 2, Han Shi West Road, Taichung, 401 TAIWAN
http://www.altoproaudio.com Tel:886-4-22313737
email: alto@altoproaudio.com Fax:886-4-22346757
All rights reserved to ALTO. All features and content might be changed
without
manual without ekaku Electron
prior notice. Any photocopy, translation, or reproduction of part of this
written permission is forbidden. Copyright 2004 S
c
NF01355-1.2
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