User's Manual
MX-20P
2-CHANNEL POWERED MIXER
2-CHANNEL POWEREDMIXER
R
LTO
www.altoproaudio.com
Version 1.1 Septemper 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 , which is the result of our LTO AUDIO TEAM's
LTO MX-30P 3-Channel POWERED Mixer
endeavours.
For the LTO AUDIO TEAM, music and audio are more than a job, it is a passion and an obsession!
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.
Because we are convinced you are the most important member of LTO AUTIO TEAM and the one confirming the
quality of our job, we like to share with you our work and our dreams, pay 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 MX-20P 2-CHANNEL POWERED MIXER has extensive features i.e. 2 phono/line inputs; 1 microphone input;
treble, middle and bass EQ on each channel; crossfader control etc., which are suitable for many other professional
applications.
We would like to thank all the people who made the LTO MX-20P 2-CHANNEL POWERED MIXER, 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. FEATURE LIST.......................................................................................................................................4
3. CONTROL ELEMENTS........................................................................................................................5
3.1 The Top Panel
3.1.1 The CHANNEL Section
3.1.2 The MIC/MAIN Section
3.1.3 The PFL (pre fader level) Section
3.1.4 The LEVEL METER Section
3.1.5 The CROSSFADER Section
3.2 The Front Panel
3.2.1 MIC IN Jack
3.2.2 PHONE OUT Jack
3.3 The Rear Panel
3.3.1 POWER IN
3.3.2 SPEAKER OUT
3.3.3 MAIN OUT
3.3.4 INPUT
3.3.5 GND Screw
3.4 The Power Supply Box
3.4.1 POWER CORD
3.4.2 POWER SWITCH
3.4.3 AC FUSE HOLDER
3.4.4 DC OUTPUT
3.4.5 FAN
4. TECHNICAL ...........................................................................................................10SPECIFICATIONS
5. SYSTEM BLOCK DIAGRAM...............................................................................................................11
6. WARRANTY.........................................................................................................................................12
3
1. INTRODUCTION
What a great powered mixer you have just bought! Your MX-20P is packed with features such as 2 phono inputs, 2 line
inputs, 1 microphone input, 3 bands equalizer and gain control for per channel.
Though your MX-20P is very easy to operate, please go through this manual carefully and you will get the best out
of your MX-20P.
2. FEATURE LIST
5 inputs: 2 phono and 2 line inputs, 1 microphone input
2 master output through RCA connector, headphone output via 1/4" TRS jack
Crossfader control
PFL button
Gain control on each channel
Treble, middle and bass equalizer on each channel
Highly accurate LEDs Meter (10-segment)
Dynamic power:
Manufactured under QS9000, VDA6.1 certified management system
2 300W 4
4
3. CONTROL ELEMENTS
3.1 The Top Panel
CHANNEL 1
LTO
R
CHANNEL 2
2-CHANNEL POWERED MIXER
PFL
MIN MAX
LEVEL
CH1 CH2
MIX
PHONO/LINE
MIN
GAIN
-30dB
TREBLE
-30 +15
MIDDLE
-30dB
BASS
MAX
+15dB
+15dB
MAIN / PFL
LEVEL METER
+10
+7
+4
+2
0
-2
-4
-7
-10
-20
PHONO/LINE
MIN
MAX
GAIN
-30dB +15dB
TREBLE
PFLMAIN
-30 +15
MIDDLE
-30dB
BASS
+15dB
MAIN / MIC
MIN MAX
MAIN
MAX
MIN
MIC LEVEL
300
CH 1 CH 2
WATT DIGITAL POWER
5
3.1.1 The CHANNEL Section
-. PHONO / LINE Switch
1
This switch is available on both input channels. You shall
use the LINE position for all high level audio signals such
as CD Players, DAT, MD, etc.. You shall use the PHONO
position to connect the turntables.
-. GAIN Control
2
Via this knob you will adjust the input level. Do not turn
this control too much clockwise or you will overload the
channel, and do not turn it too much counterclockwise
or you will generate background hiss.
-. EQUALIZER Control
Each input channel is provided with 3 bands equalizer:
Treble , Middle and Bass , and you can ad-
3 4 5
just the gain range of each from -30dB to +15dB.
-. PROGRAM Fader
6
There is a program fader available on both channels.
These faders are used to adjust the overall level of the
input channels.
CHANNEL 1
1
PHONO/LINE
2
MIN MAX
GAIN
3
-30dB
+15dB
TREBLE
4
-30 +15
MIDDLE
5
-30dB
+15dB
BASS
6
3.1.2 The MIC/MAIN Section
-. MAIN LEVEL Control
This knob controls the overall output volume.
-. MIC LEVEL Control
You can adjust the level of the microphone signal via
control.this
7
MAIN / MIC
8
7
MIN MAX
MAIN
8
MAX
MIN
MIC LEVEL
6
3.1.3 The PFL (pre fader level) Section
When you connect a headphone to your MX-20P you have
the chance of pre-listening the audio signal before the signal
reach the main output.
PFL
-. LEVEL Control
9
This knob will adjust the level of the headphone signal.
-. The MIX Control
10
Through this control, you can mix the signal between
CH1 and CH2.
3.1.4 The LEVEL METER Section
-. MAIN/PFL Switch
11
When this switch is in MAIN function (MAIN LED on) the
level Meter will display the output level of the left and
right channels; when you turn on the Mixer, both the builtin power indicator and this MAIN LED will light on.
When this switch is in PFL function (PFL LED on) the
level Meter will display the PFL of headphone signal:
channel 1 on left LEDs meter and channel 2 on right LEDs
meter.
-. LEVEL METER Display
This 10 segments LEDs Meter will indicate the output level.
12
MIN MAX
LEVEL
CH1 CH2
MIX
PFLMAIN
MAIN / PFL
LEVEL METER
+10
+7
+4
+2
0
-2
-4
-7
-10
-20
9
10
11
12
3.1.5 The CROSSFADER Section
-. FADER Control
Through this crossfader you can fade in between channel 1
and channel 2. The crossfader on your MX-20P is User
replaceable.
13
CH 1 CH 2
13
7
3.2 The Front Panel
3.2.1 MIC IN Jack
This jack will accept any unbalanced low impedance microphone. The level of microphone will be controlled by the
MIC LEVEL control on top panel.
3.2.2 PHONE OUT Jack
This jack will accept a standard headphone with a 1/4" stereo plug. Through the PFL section on top panel,
you can adjust the headphone signal properly.
3.3.The Rear Panel
17
14
MIC
IN
14
15
PHONE
OUT
15
RIGHT LEFT
+
DYNAMIC POWER:300W+300W @4
POWER IN
SP
-
-
THIS CONNECTION
FOR ALTO
POWER SUPPLY ONLY!
+
16
MAIN OUT
18
CAUTION
RISK OF ELECTRIC SHOCK
WARNING: SHOCK HAZARD
AVIS: RISQUE DE CHOC ELECTRIQUE
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
TAPEMAIN
L
R
DO NOT OPEN
- DO NOT OPEN
- NE PASOUVRIR
PHONO
LINE
INPUT 2 INPUT 1
19
MODEL
SERIAL
PHONO
LINE
L
GND
R
19
20
8
3.3.1 POWER IN
16
This connector is meant for the connection of MX-20P power supply box.
This connection for Alto power supply only!Note:
3.3.2 SPEAKER OUT
17
These connectors are meant for connection of the speakers. For your safety, please be careful when
connecting.
3.3.3 MAIN OUT
18
Both MAIN output and TAPE output are RCA type connectors. Through the MAIN output you can connect your
MX-20P to an amplifier. Through the TAPE output you can connect your MX-20P to a tape recorder.
3.3.4 INPUT
19
- PHONO input: Both Channels feature PHONO inputs including RIIA preamplifier for the turntable. PIN (RCA)
connectors shall be used to connect the turntable.
- LINE input: Through these RCA connectors you can connect a CD player, an MD player or any other high level
device such as Tape Recorder, DAT, etc..
Important Notice: If you wish to connect LINE level devices into the LINE/PHONO input, make sure that the LINE/
PHONO switch is on LINE position otherwise the sensitive RIAA preamplifier built-in in the Phono input will be
overloaded and will generate distortion.
3.3.5 GND Screw
20
GND is the supplementary grounding selection for other connected instruments.
3.4 The Power Supply Box
23
FUSE:T2AL
AC INPUT 210-240V 50Hz
POWER CONSUMPTION 400W
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
21
24
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
25
22
ON
OFF
POWER
DC OUTPUT
MODEL
SERIAL
9
3.4.1 POWER CORD
You can connect the plug of POWER CORD to the mains. Please check the voltage accepted by the unit
and the voltage available from your AC sockets before connecting the unit to the mains.
21
3.4.2 POWER SWITCH
This switch turns the Mixer ON and OFF. When you turn on the Mixer, both the power indicator and
on front panel will light on.
LED
3.4.3 AC FUSE HOLDER
The fuse is used to protect the AC supplies circuits of this unit. If the fuse blows, please change the fuse
with same specification. If the fuse continues to blow after replacing, please discontinue using this unit
and ask repair to the qualified technician.
: Don't use wire or copper wire instead of fuse.Warning
3.4.4 DC OUTPUT
You can connect the cable of DC OUTPUT to POWER IN on rear panel.
3.4.5 FAN
The fan can accelerate the flow of air to lower the temperature inside power supply box. The inside tem-
25
determines the fan speed which controls the inside air flowing speed.perature
22
24
4. TECHNICAL SPECIFICATIONS
INPUTS
OUTPUTS
Phono Inputs 1 and 2
Line Inputs 1 and 2
Mic Input
Headphones
Main Out
Tape Out
23
48dB gain@1kHz, unbalanced
8dB gain, unbalanced
58
dB gain, servo balanced
typically 125mW@ 1% THD
max +21dBu
typically 0dBu
MAIN
GENERAL
POWER SUPPLY
POWER AMP SECTION
PHYSICAL
Stereo Bass
Stereo Middle
Stereo Treble
Input Gain Adjustment
Signal to Noise ratio (S/N)
Distortion (THD)
Frequency Response
Connector type
Mains Voltage
MAX Power Consumption
Fuse
Power Amp Out
Dimension
Weight
+15dB/ 30dB
+15dB/ 30dB
+15dB/ 30dB
20dB 6dB ( 3dB)
>85dB (LINE)
0.1%
20Hz 20KHz ( 2dB)
3 pole IEC, grounded
USA / Canada: 100 120V~, 60Hz
Europe: 210 240V~, 50Hz
U.K. / Australia: 240V~, 50Hz
400W
100 120V~ : T4A
210 240V~ : T2AL
RMS: 2 80W@4
EIAJ: 2 157W@4
Dynamic Power: 2 300W 4
248(L) 245(W) 102(H)mm (9.76" 9.65" 4.01")
6.3Kg
10
5. SYSTEM BLOCK DIAGRAM
D
C
RED
BLACK
B
BLACK
RED
A
OUT
TAPE
(M AIN OUT)
L
4
AM P
(M AIN OUT)
R
L
GAIN
R
GAIN
3c5e1a
4d
2b
PHONES
SPEA KER OU T
D300W
AMP
POWER
D300W
AMP
POWER
PFL LEV EL
4
MI X
3
3
HI
LO MID
2
EQ
HI
3-BAND
LO MID
GAIN
7
8
9
P
SW3C
SW3A
1
2
3
GAIN
101112
SW3D
P
SW3B
6
5
EQ
3-BAND
P
4
HI
LO MID
EQ
HI
3-BAND
LO MID
GAIN
7
8
9
P
SW3C
SW3A
1
2
3
GAIN
101112
SW3D
P
SW3B
6
5
EQ
3-BAND
P
4
/ LINE
PHONE
2
GAIN
METER
1
3c5e1a4d2b
LINE
1(INP U T)
LINE
2(INP U T)
LEVEL
1
CHANNEL
MIC INP U T
D
PHONO
L
R
C
CHANNEL
PHONO
L
R
B
A
11
6. 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.
12
SEIKAKU TECHNICAL GROUP LIMITED
No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, 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 prior notice. Any photocopy, translation, or reproduction of part of this
manual without written permission is forbidden. Copyright 2005 SEIKAKU GROUP
c
NF02049-1.1
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