APM80.1500 - Alto Professional
User's Manual
APM80.1500
8-channel
Stereo Powered Mixer with DSP
R
LTO
www.altoproaudio.com
Version 1.0 Jan. 2007
English
Fuse
SAFETY RELATED SYMBOLS
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
Protective Ground
Before turning the product ON, make sure that it is
connected to Ground. This is to prevent the risk of
electric shock.
This symbol, wherever used, alerts you to important operating and maintenance instructions.
Please read.
Never cut internal or external Ground wires. Likewise,
never remove Ground wiring from the Protective
Ground Terminal.
Protective Ground Terminal
Operating Conditions
AC mains (Alternating Current)
Always install in accordance with the manufacturer's
instructions.
Hazardous Live Terminal
ON:
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.
Denotes the product is turned on.
OFF: Denotes the product is turned off.
WARNING
Do not install this product near any direct heat source.
Describes precautions that should be observed to
prevent the possibility of death or injury to the user.
Do not block areas of ventilation. Failure to do so
could result in fire.
CAUTION
Keep product away from naked flames.
Describes precautions that should be observed to
prevent damage to the product.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions
Disposing of this product should not be
placed in municipal waste and should be
Separate collection.
Follow all instructions
Keep these instructions. Do not discard.
Heed all warnings.
WARNING
Only use attachments/accessories specified by the
manufacturer.
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.
Power Cord and Plug
Do not tamper with the power cord or plug. These are
designed for your safety.
Unplug the product before electrical storms occur
and when unused for long periods of time to reduce
the risk of electric shock or fire.
Do not remove Ground connections!
External Connection
Protect the power cord and plug from any physical
stress to avoid risk of electric shock.
If the plug does not fit your AC outlet seek advice from
a qualified electrician.
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 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 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.
Do not use any solvents such as Benzol or Alcohol.
For safety, keep product clean and free from dust.
Servicing
Covers should be removed by qualified service
personnel only.
No user serviceable parts inside.
Refer all servicing to qualified service personnel only.
Do not perform any servicing other than those instructions contained within the User's Manual.
1
PREFACE
Dear customer
Thank you for choosing the LTO APM80.1500 8-channel stereo powered mixer with DSP, 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 musician, for musicians. With our design centres in Italy, Netherlands, and United Kingdom we provide you with world-class designs, while our software
development teams continue to develop an impressive range of audio specific algorithms.
By purchasing our LTO products you become the most important member of our LTO AUDIO TEAM. We would
like to share with you our passion for what we design and invite you to make suggestions, which will aid us in developing future products for you. We guarantee you our commitment for quality, continual research and development, and
of course the best prices.
The LTO APM80.1500 is extremely flexible, ultra-low noise 8-channel stereo powered mixer with DSP, which is
configured with six MIC/line and two stereo inputs channels, each of them is equipped with a variety of key features
including a 3-band equalizer, two aux sends and pan control etc. Besides, the miraculous DSP with 256 presets and
powerful digital power amplifier will meet your requirements. To deserve to be mentioned, the output power of LTO
APM80.1500 is 2 750W. Seeing is believing, let's meet the LTO APM80.1500.
We would like to thank all the people who made the LTO APM80.1500 possible, especially to our designers and
LTO staff. It is their passion for music and professional audio that has made it possible for us to offer you, our most
important team member, our continued support.
Thank you very much
LTO AUDIO TEAM
2
TABLE OF CONTENTS
1. INTRODUCTION.....................................................................................................................................4
2. FEATURES..............................................................................................................................................5
3. QUICK START..........................................................................................................................................6
4. CONTROL ELEMENTS...........................................................................................................................7
4.1 MONO/STEREO Input Channel Section
4.2 MASTER SECTION Control
4.3 MASTER SECTION INPUT and OUTPUT Jacks
4.4 DSP Section
4.5 Rear Panel
5. PRESET LIST.........................................................................................................................................15
6. INSTALLATION AND CONNECTION ....................................................................................................16
6.1 Audio Connections
6.2 Speaker Connections
6.3 Possible System Connection Mode for Live Sound Application
7. TECHNICAL SPECIFICATION...............................................................................................................20
8. WARRANTY...........................................................................................................................................22
3
1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by purchasing LTO APM80.1500 8channel stereo powered mixer with DSP. The APM80.1500 is professional, powerful mixer, which provides the
state of the art digital amplifier technology specifically. You will get the smooth, accurate more natural and open
sound from this apparatus, it is really ideal for large gigs, recording and fixed PA installations.
The APM80.1500 8-channel stereo powered mixer with DSP is packed with some key features. For example: there
is six MIC/line inputs which provided with ultra low noise microphone pre-amplifiers and phantom power at +48V
plus two stereo inputs, each of them features a 3-band equalizer, two aux sends, pan and level control. The master
section includes stereo return, 2-track input/output for playing back stereo devices for recording your mix, sweet equalizers for main and monitor, 256 position multieffect and built-in feedback terminator and so on.
Though your APM80.1500 is very easy to operate, we strongly recommend you to go through each section of this
manual carefully, in this way you will get the best out of your APM80.1500.
4
2. FEATURES
The APM80.1500 8-channel stereo powered mixer with DSP is designed for professional application. It provides the
following features:
Digital amplifier technology, offering high power and a very dynamic sound
9-band graphic EQ for MAIN / MONITOR
Built-in feedback terminator
6 MIC/line input channels with gold plated XLRs and balanced LINE inputs
2 Stereo input channels with balanced TRS jacks
Ultra-low noise discrete MIC preamps with +48V phantom power
Extremely high headroom offering more dynamic range
3-band equlizer on input channels
Each input channel with -20dB PAD, PAN and level control
2 AUX sends for built-in or external effects, on-stage monitor mix, or headphone mixing
256 position multieffect
2-track recording IN/OUT (phono)
Headphone output
2 750 watt EIAJ amplifiers (For APM80.1500)
Output connector: 6.3
jack + 4 way-speakon
5
3. QUICK START
3.1 Please check the AC Voltage available in your country before connecting your APM80.1500 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 Please connect one side of the speaker cable to speakon or phone jacks of your APM80.1500 and the other
side to the input socket of your speaker cabinet; or connect one side to the main output L/R of your APM80.1500
And other side to the input socket of your active speaker cabinet or other stereo power amplifier.
3.4 Complete these connections as illustrated.
3.5 When no external power amplifier or active speaker connected to the main output L/R of your APM80.1500,
please switch on your APM80.1500 after turning on all external devices; after using, switch off your APM80.1500
Before all external devices.
3.6 When the external power amplifier or active speaker connected to the main output L/R of your APM80.1500
please switch on your APM80.1500 before the external power amplifier or active speaker. After using, switch
off your APM80.1500 after the external power amplifier or active speaker.
3.7 Before disconnecting the APM80.1500 always turn-off the Power switch.
3.8 Do not use solvents to clean your APM80.1500. A dry and clean cloth will be OK.
Active speaker 2
Passive speaker 2
Passive speaker 2
R
LTO
POWERED MIXER
MODEL: APM80.1500
POWER
ON
OFF
LEFT/MONO MAIN
OUTPUT 2
1+
1POS NEG
VOLTAGE SELECTOR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
INPUT
~100-120
VAC
100 - 120VAC~60Hz
2 500 W @ 4 OHM
2 270 W @ 8 OHM
OUTPUT 2
220 - 240VAC~50Hz
RATED POWER CONSUMPTION:650W
(4 OHM MIN. LOAD)
BRIDGE MODE:
1000 W @ 8 OHM
OUTPUT 1
6
~220-240
VAC
110-120V
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
STEREO MODE:
AC
220-240V
(8 OHM MIN. LOAD)
CLASS 2 WIRING MAY BE USED
FUSE:
100~120V: T10A 250V
220~240V: T6.3A 250V
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MODEL
SERIAL
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
4. CONTROL ELEMENTS
7
4.1 MONO/STEREO Input Channel Section
Your APM80.1500 comprises 6 mono input channels
and 2 stereo input channels, each of them including -20dB
PAD, 3-band equalizer, AUX sends, PAN and LEVEL controls. The following content will detail the each part.
CH 7-8
CH 6
R
LINE IN
(bal.)
(MONO)
1 MONO Input Channels (1 ~ 6)
L
LOW NOISE P
RE
A
P
2
RE
A
M
P
Note: You shall never connect an unbalanced microphone
to the XLR connector if you do not want to damage both
the microphone and the mixer.
LOW NOISE P
M
There are CH1 through CH6, which comes with MIC IN
and LINE IN connector. Use the XLR MIC IN connector
to connect low noise microphones preamp and low level
signal, which also feature +48V phantom power, allowing
you to connect condenser microphones. Use the 1/4" TRS
LINE IN connector to connect either a microphone or a
line level instrument such as synthesizers, drum machines,
effects processors...
1
2
1
3
3
MIC IN (bal.)
MIC IN (bal.)
1
2
2 STEREO Input Channels (7 ~ 10)
There are CH7 through CH10. They are organised in stereo
pair. Via the 1/4" TRS input connectors, you can connect the
outputs from stereo devices such as synthesizers, effects
processor or any stereo line level signal. If only the right jack
was connected, the input will operate in mono mode.
Via the XLR MIC IN connector, you can input the low level
signal.
-20 dB
PAD
3
0dB
HIGH
12KHz
+15dB
-15dB
0dB
MID
3 -20dB PAD Button
Pressing this button will attenuate the input signal by 20dB.
In such way you can produce increased headroom and
reduce the risk of distortion because of level peaks at input
level when the input signal is quite hot.
4
2.5KHz
-15dB
+15dB
0dB
LOW
80Hz
4 EQUALIZER
-15dB
+15dB
0dB
Your APM80.1500 features a 3-band equalizer allowing
you adjust the high, mid and low frequencies separately
on each channel. All bands provide up to 15dB of boost
or cut, flat at the center detent.
MON
AUX1
PRE
0dB
HIGH
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.
LOW
This is the bass control. It is used to Boost male voice or
kickdrum and bass guitar. Your system will sound much
bigger than what it is.
8
DSP/FX
AUX2
POST
6
+10dB
8
-
PAN
7
Left
Right
0
dB
8
-
8
MID
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 a very wide
panorama of sound effects.
+10dB
8
-
5
+10dB
LEVEL
5 MON (AUX1) Control
Your APM80.1500 has two auxiliary sends which can be used for sending signals to external or internal effects
device or for creating a monitor mix, they are used to adjust the level of respective channel signal sent to AUX bus,
and the adjustable range goes from - to +10dB.
The AUX1 control is configured as PRE-FADER, which means that the signal is sent out before reaching the channel
fader. It is used for a monitor mix in a live sound mixing, or for a headphone mix in recording application.
6 DSP/FX (AUX2) Control
The AUX2 control is configured as POST-FADER, so the audio signal will be affected by channel fader. Via the
AUX2 OUT jack, the AUX2 signal can be sent to an external effects device, furthermore, the AUX2 signal can also
be assigned to internal onboard effect module.
7 PAN Control
Abbreviation of PANORAMA control for mono and stereo channels. It is used to determine the amount of channel
signal sent to left and right of main mix. Keep this control in center position, then the signal will be positioned in
middle of stage. Turn this control fully counterclockwise, the signal will be present only on the left of main mix and
vice-versa.
8 Channel LEVEL Control
This control is used to adjust the overall level of respective channel. The adjustable range goes from -
to +10dB.
4.2 MASTER SECTION Controls
12
9
10
11
9 STEREO GRAPHIC EQ
Your APM80.1500 is equipped with both stereo graphic EQs, one is for MAIN MIX; another for MONITOR MIX,
each of them provides 9-band fader controls. Via these faders, you can boost or attenuate the selected frequency
by 15dB at a preset bandwidth. When all faders are at the center position, the output of the equalizer is flat response. They are used to modify the frequency "contour" of a sound. The EQ function will be activated automatically
as soon as you operate your APM80.1500.
10 FEEDBACK TERMINATOR Button (MONITOR MIX)
Pressing this button the automatic feedback detection function will be activated in monitor signal path. When a
frequency band fader lights up, it means the level of this frequency band is too high, i.e. there is a little feedback
occurring in this frequency band, which may result in unpleasant speaker "howling" or " whistling " . In this case,
in order to eliminate feedback, you need to turn down the corresponding fader.
9
11 MONITOR LEVEL Control
This control is used to adjust the level of monitor output.
12 MONITOR LEVEL LED Display
This LED display is used to monitor the monitor output level.
15
9
13
14
13 FEEDBACK TERMINATOR Button (MAIN MIX)
Pressing this button the automatic feedback detection function will be activated in main mix signal path. When a
frequency band fader lights up, it means the level of this frequency band is too high, i.e. there is a little feedback
occurring in this frequency band, which may result in unpleasant speaker "howling" or "whistling" . In this case,
in order to eliminate feedback, you need to turn down the corresponding fader.
14 MAIN MIX LEVEL Control
This control is used to adjust the overall volume of main mix output.
15 MAIN MIX LEVEL LED Display
The stereo 4 segments LED display is used to monitor the main mix output level.
16
16 OPERATING LED Display
The LED indicates when the power is switched on in your APM80.1500.
10
17 PHANTOM 48V Switch
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.
Pushing the switch to right will apply +48V phantom power only to
the 8 XLR microphone inputs.
PHANTOM
48V
OFF
18 AMPLIFIER MODE Switch
ON
AMPLIFIER
MODE
MAIN
MAIN BRIDGE
+
+
MAIN MONITOR
18
17
This switch provides three modes: MAIN/MAIN; MAIN/MONITOR;
BRIDGE. Select any one of these modes to specify the signals to
be routed to the corresponding jacks according to the speaker
connection at speaker jacks on the rear panel.
The details refer to later content.
4.3 MASTER SECTION INPUT and OUTPUT Jacks
19
20
21
19 MONITOR OUT Jack
Use the balanced MONITOR jack to connect the input of external monitor amplifier or active monitor speaker.
20 MAIN OUT Jacks
The both jacks are used to output the main mix signal to an external amplifier or active speaker.
21 HEADPHONE OUT Jack
This is a stereo phone type output jack, it is used to send out the monitor signal to a pair of headphones.
22 AUX2 OUT Jack
The phone jack is used to output the line level signal of AUX2 bus.
Generally, it is available to connecting effects unit.
AUX2
OUT
22
23 STEREO RTN. Jack
Use the stereo phone jack to return the sound of an effect unit to
the main mix. You can also use it as the extra auxiliary inputs.
11
STEREO
RTN
23
24 TAPE TO Select Switch
Pushing this switch to left will route the signal from TAPE IN to
CH9~10 path, and the signal will be affected by channel level
control and main level control, while to right will route the signal
to main mix bus, the signal will be affected only by main level
control.
24
25 2-TRACK IN
Your APM80.1500 features dual RCA jacks for 2-track in (left
and right). If you wish to listen to your mix from a tape recorder,
DAT or cassette, please use these tape input jacks. Depending
on the setting of TAPE TO select switch, you can assign the signal
coming from the tape recorder (DAT or cassette) to CH9~10 path
or main mix bus.
25
26
26 2-TRACK OUT
DSP
Your APM80.1500 features dual RCA jacks for 2-track out (left
and right). Via these jacks, you can route the main mix signal into
a tape recorder or DAT for recording.
PRESETS
16
1
2
15
3
4
14
5
13
4.4 DSP Section
APM80.1500 features the special 256 position multi-effect,
further details please refer to following content.
27
6
12
7
11
10
9
8
CLIP
29
30
DSP
MUTE
MUTE
VARIATIONS
27 PRESETS Control
16
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, modulation effects, and versatile two-effect
combination.
1
2
15
3
4
14
5
13
28
6
12
7
11
10
9
8
28 VARIATIONS Control
Since you have selected the preferable effect, the next step, please
go with the fine consideration, there are also total 16 variations for
each preset, and each variation has been designed modifying several
parameters.
DSP
-
8
TO MON
31
+10dB
PRESETS:
29 DSP MUTE Switch
This switch is used to activate/deactivate the effect facility. Sometimes,
you can also use the following FOOT SW jack for convenient operation
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. REVERB + FLANGER
16. REVERB + CHORUS
30 CLIP/MUTE LED
0
dB
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.
DSP
-
8
TO MAIN
32
+10dB
31 DSP TO MON Control
This control is used to control the volume of effect signal sent to
monitor mix, which can be varied from - to +10dB.
12
FOOT
SW.
33
32 DSP TO MAIN Control
This control is used to control the volume of effect signal sent to main mix bus, which can be varied from +10dB.
to
33 FOOT SW. Jack
Here, you can connect an external footswitch to turn on/off the onboard effect module. It is 1/4" phone jack.
4.5 Rear Panel
34
R
LTO
POWERED MIXER
MODEL: APM80.1500
POWER
ON
OFF
LEFT/MONO MAIN
OUTPUT 2
1+
1POS NEG
VOLTAGE SELECTOR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
2 500 W @ 4 OHM
2 270 W @ 8 OHM
INPUT
~100-120
VAC
OUTPUT 2
220 - 240VAC~50Hz
RATED POWER CONSUMPTION:650W
OUTPUT 1
~220-240
VAC
110-120V
STEREO MODE:
AC
100 - 120VAC~60Hz
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
(4 OHM MIN. LOAD)
BRIDGE MODE:
1000 W @ 8 OHM
220-240V
(8 OHM MIN. LOAD)
CLASS 2 WIRING MAY BE USED
FUSE:
100~120V: T10A 250V
220~240V: T6.3A 250V
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MODEL
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
SERIAL
35
37
36
34 POWER ON/OFF Switch
This switch is used to turn the main power ON and OFF.
35 AC Inlet with FUSE Holder
Use it to connect your APM80.1500 to the main AC with the supplied AC cord. Please check the voltage available
in your country and how the voltage for your APM80.1500 is configured before attempting to connect your
APM80.1500 to the main AC.
36 SPEAKERS Jacks
These jacks are used to connect speakers. They are configured with 4-way speakon connectors and 1/4" phone
jacks. You can determine the signal that is output to these jacks according to the setting of AMPLIFIER MODE
select switch.
Note: In order to avoid damaging your built-in amplifier, please pay more attention to the impedance of speaker.
Lower load impedances are not permitted.
37 AC Select Switch
This switch has two choices for voltage, 115 VAC or 230 VAC.
Note: If you want to switch the voltage, remove the cover plate with a screwdriver and set the switch to the 115
VAC or 230VAC as the actual requirement. Refer to the specification page 20 for instructions of replacing fuse.
13
7. PRESET LIST
No.
Preset
Description
Controllable parameter
Parameter
Variable range
1
VOCAL 1
Simulate a room with small delay time.
Decay time
Pre-delay
0.8~1.1s
0~79ms
2
VOCAL 2
Simulate a small space with slight decay time.
Decay time
Pre-delay
0.8~2.5s
0~79ms
3
LARGE HALL
Simulate a large acoustic space of the sound.
Decay time
Pre-delay
3.6~5.4s
23~55ms
4
SMALL HALL
Simulate a small acoustic space of the sound.
Decay time
Pre-delay
1.0~2.9s
20~45ms
5
LARGE ROOM
Simulate a studio room with many early reflections. Decay time
Pre-delay
6
SMALL ROOM
Simulate a bright studio room.
Decay time
Pre-delay
0.7~2.1s
20~45ms
7
PLATE
Simulate the transducers sound like classic bright
vocal plate.
Decay time
Pre-delay
0.6~6.1s
10ms
8
TAPE REVERB
Simulate a record head and multiple playback heads Decay time
at intervals along the tape.
Pre-delay
1.3~5.4s
0~84ms
9
SPRING REVERB Simulate the analog transducers' springs lightly Decay time
Pre-delay
stretched sound.
1.3~5.4s
0~35ms
10
MONO DELAY
Reproduce the sound input on the outputafter a Period
lapse of time.
60~650ms
11
STEREO DELAY
Recreate the input sound on the stereo output with Period
Feedback
different time.
210~400ms
37~73%
12
FLANGER
Simulate to play with another person carryingout Rate
sam e the notes on the same instrument
0.16~2.79Hz
13
CHORUS
Recreate the illusion of more than one instrument Rate
from a single instrument sound
0.5~5Hz
14
REV.+DELAY
Delay with room effect
Delay period
Rev. decay time
211~375ms
1.0~2.9s
15
REV.+FLANGER
Stereo chorus and large room reverb
Flanger Rate
Rev. decay time
0.16~2.52Hz
1.5~2.9s
16
REV.+CHORUS
Simulate the sound effect achieved by rotating horn Chorus rate
Rev. decay time
speakers and a bass cylinder
14
2.9~4.5s
23~55ms
0.5~4.74Hz
1.5~2.9s
6. INSTALLATION AND CONNECTION
Ok, you have got to this point and you are now in the position to successfully operate your APM80.1500. 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.
Set the output level of your APM80.1500 or the connected power amplifier at no more than 75%.
Now, set the MONITOR 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 EQ controls on middle position.
Position panoramic (PAN) control on center position.
Increase the input gain properly for maintaining the good headroom and ideal dynamic range.
Depending on the actual application, turn slowly the input and output level controls for obtaining the maximum
gain before distortion.
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.
6.1 Audio Connections
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
1/4" Stereo (TRS) Jack Plug
Sleeve
Tip
Tip=Signal
Strain Clamp
Sleeve=Ground/Screen
Use for Mono Line In, Mono 1/4"Jack Plugs
1/4" Mono (TS) Jack Plug
15
Ring=Return Signal
Tip
Sleeve
Ring
Strain Clamp
Tip=Send Signal
Sleeve=Ground/Screen
Use for Insert Points
1/4" Stereo (TRS) Jack Plug
2=Hot(+)
2
1
3
2
2=Hot(+)
1=Ground/Screen
1
3
3=Cold(-)
1=Ground/Screen
3=Cold(-)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
Use for Main output
(For unbalanced use, leave pin 3 unconnected)
3-pin XLR Male Plug
3-pin XLR Line Socket
(seen from soldering side)
(seen from soldering side)
6.2 Main Speaker Connections
Please use only the power connectors to make connections with other signal source equipment for the passive speaker
cabinets. The power connector has four terminals: 1+, 1-, 2+, 2-.
1-
2-
1+
2+
Speakon connector
Your APM80.1500 features three modes for connecting the main speakers. The speaker impedance requirement
varies depending on how you connect the speaker. In order to avoid damaging your built-in amplifier, please pay
more attention to the impedance of speaker. Lower load impedances are not permitted. The further details, you
can refer to the mark on rear panel.
STEREO MODE:
2 750 W @ 4 OHM
2 400 W @ 8 OHM
(4 OHM MIN. LOAD)
BRIDGE MODE:
1500 W @ 8 OHM
(8 OHM MIN. LOAD)
CLASS 2 WIRING MAY BE USED
16
Here some illustrations will give you some helpful suggestions.
Main Speaker
LEFT/MONO MAIN
AMPLIFIER
MODE
OUTPUT 2
1+
1POS NEG
OUTPUT 2
OUTPUT 1
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MAIN
MAIN BRIDGE
+
+
MAIN MONITOR
Bridge Mode
Main Speaker
AMPLIFIER
MODE
LEFT/MONO MAIN
OUTPUT 2
1+
1POS NEG
OUTPUT 2
OUTPUT 1
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MAIN
MAIN BRIDGE
+
+
MAIN MONITOR
Use either the speakon jacks
or phone jacks
Monitor Speaker
MAIN + MONITOR Mode
Main Speaker
LEFT/MONO MAIN
AMPLIFIER
MODE
OUTPUT 2
1+
1POS NEG
OUTPUT 2
OUTPUT 1
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MAIN
MAIN BRIDGE
+
+
MAIN MONITOR
Use either the speakon jacks
or phone jacks
Main Speaker
MAIN + MAIN Mode
17
6.3 Possible System Connection Mode for Live Sound Application
Read through the "QUICK START" chapter and previous setting procedures , you will know how to start your system
quickly and adjust the channel setting under safety conditions. Here shows the APM80.1500 in a live sound
system. The following section explains the basic connection and operating.
For input section, connect three or more microphones to mono MIC channels (1~3); connect synthesizers or signal
processor to either line input of stereo channel 7~8 or line input of mono channel; connect the CD player to line
input of mono or stereo channel; other stereo line signal source can be connected to line input of channel 9~10.
For output section, you can connect either an external amplifier or active speaker to the monitor output jack. Through the main output jacks on front panel, you can connect an external power amplifier to driving the 2 sub-woofers
or 2 active speakers. Besides, you can connect a pair of headphone to headphone output jack. There are powered
mix output connectors on rear panel, through these, you can connect 2 passive main speakers.
Normally, more speaker outputs are needed,
you can use the AUX2 output jack to connect
the power amplifier for driving the studio monitor
speaker.
If necessary, you can also use the 2-track in/
out connectors to connect the DAT or cassette
for recording.
R
L
R
LTO
POWERED MIXER
MODEL: APM80.1500
POWER
ON
OFF
LEFT/MONO MAIN
OUTPUT 2
1+
1POS NEG
VOLTAGE SELECTOR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
AC
CAUTION:
INPUT
~100-120
VAC
100 - 120VAC~60Hz
REPLACE WITH THE SAME TYPE FUSE AND RATING
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE
RATED POWER CONSUMPTION:650W
2 500 W @ 4 OHM
2 270 W @ 8 OHM
OUTPUT 1
~220-240
VAC
110-120V
STEREO MODE:
OUTPUT 2
220 - 240VAC~50Hz
(4 OHM MIN. LOAD)
BRIDGE MODE:
1000 W @ 8 OHM
220-240V
(8 OHM MIN. LOAD)
CLASS 2 WIRING MAY BE USED
FUSE:
100~120V: T10A 250V
220~240V: T6.3A 250V
BRIDGE MODE
RIGHT/MONITOR
BRIDGE
2+
1+
POS NEG
OUTPUT 1
1+
1POS NEG
MODEL
SERIAL
Apparaten skall anslutas
till jordat uttag nar den
ansluts till ett natverk
Cassette or DAT
CD Player
Synthesizers
ON
Other stereo
line level signal
L
Vocal MIC
Monitor
18
R
5. TECHNICAL SPECIFICATION
Mono input channels
Microphone input
Frequency response
Distortion (THD & N)
Gain
SNR (Signal to Noise Ratio)
Line input
Frequency response
Distortion (THD & N)
Gain
>90dB
electronically balanced
10Hz to 55kHz, + 3dB
0.04% at + 4dBu, 1kHz
30dB
Line input
Frequency response
Distortion (THD & N)
Unbalanced
10Hz to 55kHz, + 3dB
0.006% at +4dBu, 1kHz
Microphone input
Channel Insert return
All other inputs
Tape out
All other output
1.4kOhm
2.5kOhm
10kOhm or greater
1kOhm
120Ohm
Hi shelving
Mid bell
Low shelving
+
+
+
A/D and D/A converters
DSP resolution
Type of effects
24 bit
24 bit
Hall, Room, Vocal & Plate REVERBS
Mono & Stereo DELAY (max DELAY TIME 650ms)
Chorus, Flanger & Reverb MODULATIONS
REVERB+DELAY, REVERB+CHORUS,
REVERB+FLANGER combinations
256
16-position PRESET Selector
16-position VARIATION selector
electronically balanced, discrete input configuration
10Hz to 55kHz, + 3dB
0.006% at + 4dBu, 1kHz
50dB (MIC)
Stereo input channels
Impedances
Equalization
15dB @12kHz
15dB @2.5kHz
15dB @ 80Hz
DSP Section
Presets
Controls
CLIP LED
MUTE SWITCH with LED indicator
Main Mix Section
Noise (Bus noise)
Fader 0 dB, channels muted: 85dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned and set to
UNITY gain: 71dBr (ref.:+4dBu)
+27dBu balanced ,
+22dBu unbalanced, 1/4" jacks
+22dBu
Max output
AUX Sends max out
19
Output Power
APM80.1500
Stereo mode: 680W(RMS) @ 4ohm
770W(EIAJ) @ 4ohm
429W(RMS) @ 8ohm
399W(EIAJ) @ 8ohm
Bridge mode: 1553W @ 8ohm
Power supply
Main voltage
100 - 120VAC ~ 60Hz
220 - 240VAC ~ 50Hz
100 ~ 120V : T10A 250V
220 ~ 240V : T6.3A 250V
Fuse
Physical
Dimension (W D H)
550mm 220mm 310mm
(8.66" 12.20" 21.65")
Weight
(Net) : 8.0kg (17.63lb)
(Gross) : 10.8kg (23.8lb)
20
8. 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 exclusion 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.
21
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: [email protected] 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 c 2007 SEIKAKU GROUP
NF 02706 -1.0
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