Alto APM-80.1500 Users Manual

APM80.1500

User's Manual

8-channel

Stereo Powered Mixer with DSP

R

LTO

www.altoproaudio.com

Version 1.0 Jan. 2007

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 8-channel stereo powered mixer with DSP, which is the result ofLTO APM80.1500
our AUDIO TEAM's endeavours.LTO

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 is extremely flexible, ultra-low noise 8-channel stereo powered mixer with DSP, which is

APM80.1500

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

is 2 750W. Seeing is believing, let's meet the LTO .APM80.1500 APM80.1500

We would like to thank all the people who made the LTO possible, especially to our designers andAPM80.1500

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 to the AC socket.APM80.1500

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 and the otherAPM80.1500
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 after turning on all external devices; after using, switch off yourAPM80.1500 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

please switch on your before the external power amplifier or active speaker. After using, switch

APM80.1500

APM80.1500

off your after the external power amplifier or active speaker.APM80.1500

3.7 Before disconnecting the always turn-off the Power switch.

APM80.1500

3.8 Do not use solvents to clean your . A dry and clean cloth will be OK.APM80.1500

Active speaker 2

Passive speaker 2

Passive speaker 2

CAUTON

RSK OF LE TRC SHOCK

DONOT O EN

WARNNG SHOCKHAZARD

DONOT OPEN

AVS RISQUEDE CHOC ELECTR QUE

EPASOUVR R

CAUT ON:

REPLACEWITH THE SAME TY EFUSE AND RAT NG
DSCONNECT UPPLYCORD BEFORE CHANGING FUSE

STEREO MODE 500 W @ 4 OHM

270 W @ 8 OHM

4 OHM MIN LO D)

BRIDGE MODE 1000 W @ 8 OHM

8 OHM MIN LO D)

CLASS 2 WRING MAY BE USED

POWER

ON OFF

AC INPUT

100 1 0VAC 60Hz

220 2 0VAC 50Hz

RA ED OWER CONSUMP ION 65 W

10 2 V

20 4V

100~120V T10A 250V

FUSE

220~240V T6 3A 250V

~100-120

~220-240

VOLTAGESELECTOR

VAC

VAC

LTO

POWERED MIXER
MODEL: APM80.1500

MODEL

S RIAL

BRIDGE MODE

BRIDGE

2+ 1+

POS NEG

Apparaen skall anslutas
tll ordatut ag nar den
anslutst ll ett natverk

LEFT/MONO MAIN

OUTPUT 2

1+ 1-

POS NEG

OUTPUT 2

OUTPUT 1

RIGHT/MONITOR

OUTPUT 1

1+ 1-

POS NEG

4. CONTROL ELEMENTS

7

4.1 MONO/STEREO Input Channel Section

Your comprises 6 mono input channels

APM80.1500

and 2 stereo input channels, each of them including -20dB
PAD, 3-band equalizer, AUX sends, PAN and LEVEL con­t ls. The following content will detail the each part.ro

MONO Input Channels (1 ~ 6)

1

CH 6

LINE IN

(bal.)

CH 7-8

R

(MONO)

L

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, dr m machines,u
effects processors...

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.

STEREO Input Channels (7 ~ 10)

2

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.

-20dB PAD Button

3

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.

N

O

W

I

S

O

E

L

12

3

MIC IN (bal.)

1

-15dB-15dB

-15dB-15dB

P

R

E

A

M

P

-20 dB
PAD

0dB0dB

0dB0dB

0dB0dB

+15dB+15dB

+15dB+15dB

O

L

MIC IN (bal.)

HIGHHIGH

12KHz12KHz

MIDMID

2.5KHz2.5KHz

LOWLOW

N

O

W

I

S

E

P

R

E

A

M

P

12

3

2

3

4

EQUALIZER

4

Your features a 3-band equalizer allowingAPM80.1500
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.

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.

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.

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.

-15dB-15dB

--

--

LeftLeft

--

+15dB+15dB

0dB0dB

88

+10dB+10dB

0dB

88

+10dB+10dB

RightRight

0dB0

dB

88

+10dB+10dB

LEVEL

80Hz80Hz

MON

AUX1

PRE

DSP/FX

AUX2
POST

PAN

5

6

7

8

8

MON (AUX1) Control

5

Your has tw auxiliary sends which can be used for sending signals to external or internal effectsAPM80.1500 o
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.

DSP/FX (AUX2) Control

6

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.

PAN Control

7

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.

Channel LEVEL Control

8

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

STEREO GRAPHIC EQ

9

Your is equipped with both stereo graphic EQs, one is for MAIN MIX; another for MONITOR MIX,

APM80.1500

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

11

FEEDBACK TERMINATOR Button (MONITOR MIX)

10

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

MONITOR LEVEL Control

11

This control is used to adjust the level of monitor output.

MONITOR LEVEL LED Display

12

This LED display is used to monitor the monitor output level.

15

9

FEEDBACK TERMINATOR Button (MAIN MIX)

13

13

14

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.

MAIN MIX LEVEL Control

14

This control is used to adjust the overall volume of main mix output.

MAIN MIX LEVEL LED Display

15

The stereo 4 segments LED display is used to monitor the main mix output level.

16

OPERATING LED Display

16

The LED indicates when the power is switched on in your .

APM80.1500

10

PHANTOM 48V Switch

17

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.

AMPLIFIER MODE Switch

18

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

PHANTOM

48V

OFF MAIN

17

AMPLIFIER

MODE

MAIN

+

+

MAIN

MONITOR

18

BRIDGEON

MONITOR OUT Jack

19

19

20

21

Use the balanced MONITOR jack to connect the input of external monitor amplifier or active monitor speaker.

MAIN OUT Jacks

20

The both jacks are used to output the main mix signal to an external amplifier or active speaker.

HEADPHONE OUT Jack

21

This is a stereo phone type output jack, it is used to send out the monitor signal to a pair of headphones.

AUX2 OUT Jack

22

The phone jack is used to output the line level signal of AUX2 bus.
Generally, it is available to connecting effects unit.

STEREO RTN. Jack

23

Use the stereo phone jack to return the sound of an effect unit to

AUX2

OUT

STEREO

RTN

the main mix. You can also use it as the extra auxiliary inputs.

22

23

11

TAPE TO Select Switch

24

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.

2-TRACK IN

25

Your features dual RCA jacks for 2-track in (left

APM80.1500

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.

2-TRACK OUT

26

Your features dual RCA jacks for 2-track out (leftAPM80.1500
and right). Via these jacks, you can route the main mix signal into
a tape recorder or DAT for recording.

4.4 DSP Section

APM80.1500 features the special 256 position multi-effect,
further details please refer to following content.

PRESETS Control

27

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.

29

25 26

DSP

PRESETS

1

16

15

14

13

12

11

10

9

DSP

MUTE

VARIATIONS

1

16

15

14

13

12

11

10

9

24

2

3

4

5

6

7

8

CLIP

27

30

MUTE

2

3

4

5

6

7

8

28

VARIATIONS Control

28

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 MUTE Switch

29

This switch is used to activate/deactivate the effect facility. Sometimes,
you can also use the following FOOT SW jack for convenient operation

CLIP/MUTE LED

30

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 TO MON Control

31

This control is used to control the volume of signal sent to

effect

monitor mix, which can be varied from - to +10dB.

8

-

+10dB

PRESETS:

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

0

dB

8

-

+10dB

DSP

TO MON

DSP

TO MAIN

FOOT

SW.

31

32

33

12

DSP TO MAIN Control

32

This control is used to control the volume of signal sent to main mix bus, which can be varied from - to

effect

+10dB.

FOOT SW. Jack

33

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

LTO

POWERED MIXER
MODEL: APM80.1500

MODEL

SERAL

BRIDGE MODE

BRIDGE

2+ 1+

POS NEG

Apparatenskall anslutas
tll jordat uttag nar den
anslutst ll ett natverk

LEFT/MONO MAIN

OUTPUT 2

1+ 1

POS NEG

OUTPUT 2

OUTPUT 1

RIGHT/MONITOR

OUTPUT 1

1+ 1

POS NEG

CAUTON

RSK OF ELECTR C S O K

DONOT O EN

WARNNG SHOCK HAZARD

DONOT O EN

AVS R SQUE DE CHOC ELECTRIQUE

CAUTION:

REPLACE W TH THE SAME TYPE FUSE AND RAT NG
DSCONNECT SUPP Y CORD BEFORE CHANGING FUSE

-NE PAS OUVR R

STEREO MODE 500 W @ 4 OHM

270 W @ 8 OHM

4 OHM MIN OAD)

BRIDGE MODE 1000 W @ 8 OHM

8 OHM MIN OAD)

CLASS 2 WR NG MAY BE USED

POWER

ON OFF

AC INPUT

100- 120VAC~60Hz

220- 240VAC~50Hz

RATEDPOWER CONSUMPT ON 650W

10 12 V

202 0V

~100-120

~220-240

100~120V T10A 250V

FUSE

220~240V T6 3A 250V

VOLTAGESELECTOR

VAC

VAC

POWER ON/OFF Switch

34

35

37

36

This switch is used to turn the main power ON and OFF.

AC Inlet with FUSE Holder

35

Use it to connect your to the main AC with the supplied AC cord. Please check the voltage available

in your country and how the voltage for your is configured before attempting to connect your

APM80.1500

APM80.1500

APM80.1500 to the main AC.

SPEAKERS Jacks

36

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.

1

VOCAL 1

2

VOCAL 2

3

4

5

6

7

PLATE

TAPE REVERB

8

Preset

Description

Simulate a room with small delay time.

Simulate a small space with slight decay time.

Simulate a large acoustic space of the sound.LARGE HALL

Simulate a small acoustic space of the sound.SMALL HALL

Simulate a studio room with many early reflections.LARGE ROOM

Simulate a bright studio room.SMALL ROOM

Simulate the transducers sound like classic bright
vocal plate.

Simulate a record head and multiple playback heads
at intervals along the tape.

Controllable parameter

Parameter Variable range

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

Decay time
Pre-delay

0.8~1.1s
0~79ms

0.8~2.5s
0~79ms

3.6~5.4s
23~55ms

1.0~2.9s
20~45ms

2.9~4.5s
23~55ms

0.7~2.1s
20~45ms

0.6~6.1s
10ms

1.3~5.4s
0~84ms

9

SPRING REVERB Simulate the analog transducers' springs lightly

stretched sound.

10

MONO DELAY

11

STEREO DELAY

12

FLANGER

13

CHORUS

REV.+DELAY

14

15

REV.+FLANGER

16

REV.+CHORUS

Reproduce the sound input on the outputafter a
lapse of time.

Recreate the input sound on the stereo output with
different time.

Simulate to play with another person carryingout
sam e the notes on the same instrument

Recreate the illusion of more than one instrument
from a single instrument sound

Delay with room effect

Stereo chorus and large room reverb

Simulate the sound effect achieved by rotating horn
speakers and a bass cylinder

Decay time
Pre-delay

Period

Period
Feedback

Rate

Rate

Delay period
Rev. decay time

Flanger Rate
Rev. decay time

Chorus rate
Rev. decay time

1.3~5.4s
0~35ms

60~650ms

210~400ms
37~73%

0.16~2.79Hz

0.5~5Hz

211~375ms

1.0~2.9s

0.16~2.52Hz

1.5~2.9s

0.5~4.74Hz

1.5~2.9s

14

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.

APM80.1500Set the output level of your 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=Left Signal

Strain Clamp

Sleeve

Tip

Ring

Sleeve=Ground/Screen

Use for Headphone

1/4" Stereo (TRS) Jack Plug

Sleeve

Strain Clamp

Tip

Tip=Signal

Sleeve=Ground/Screen

Use for Mono Line In, Mono 1/4"Jack Plugs

1/4" Mono (TS) Jack Plug

15

Sleeve

Tip

Ring=Return Signal

Ring

Strain Clamp

2

2=Hot(+)

3=Cold( )

Use for Balanced Mic Inputs

(For unbalanced use, connect pin 1 to 3)

1

3

3-pin XLR Male Plug

(seen from soldering side)

Sleeve=Ground/Screen

Use for Insert Points

1/4" Stereo (TRS) Jack Plug

1=Ground/Screen

2=Hot(+)

(For unbalanced use, leave pin 3 unconnected)

3-pin XLR Line Socket

Tip=Send Signal

2

1

3

3=Cold( )

Use for Main output

(seen from soldering side)

1=Ground/Screen

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 features three modes for connecting the main speakers. The speaker impedance requirementAPM80.1500
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

BRIDGE MODE: 1500 W @ 8 OHM

CLASS 2 WIRING MAY BE USED

2 400 W @ 8 OHM

(4 OHM MIN. LOAD)

(8 OHM MIN. LOAD)

16

Here some illustrations will give you some helpful suggestions.

Main Speaker

BRIDGE MODE

BRIDGE

2+ 1+

POS NEG

BRIDGE MODE

BRIDGE

2+ 1+

POS NEG

LEFT/MONO MAIN

OUTPUT 2

1+ 1

POS NEG

OUTPUT 2

OUTPUT 1

RIGHT/MONITOR

OUTPUT 1

1+ 1

POS NEG

LEFT/MONO MAIN

OUTPUT 2

1+ 1

POS NEG

OUTPUT 2

OUTPUT 1

RIGHT/MONITOR

OUTPUT 1

1+ 1

POS NEG

Bridge Mode

Main Speaker

AMPLIFIER

MODE

MAIN

MAIN

+

+

MONITOR

MAIN

AMPLIFIER

MODE

MAIN

MAIN

+

+

MONITOR

MAIN

BRIDGE

BRIDGE

Use either the speakon jacks
or phone jacks

LEFT/MONO MAIN

OUTPUT 2

1+ 1

POS NEG

OUTPUT 2

OUTPUT 1

BRIDGE

2+ 1+

POS NEG

RIGHT/MONITOR

OUTPUT 1

1+ 1

POS NEG

BRIDGE MODE

Use either the speakon jacks
or phone jacks

Monitor Speaker

MAIN + MONITOR Mode

Main Speaker

AMPLIFIER

MODE

MAIN

MAIN

+

+

MONITOR

MAIN

BRIDGE

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 Here shows the in a live soundunder safety conditions.

APM80.1500

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

L

R

for recording.

RS OF L C R C S O K

ON T O EN

W RN NG: HOCKH ZARD

DON TO EN

VS: R SQ E DE CHOC LEC R QUE

EP S O VIR

CAUTION

EP ACE W TH HE SA ETY E FU E AND R TNG
I CON ECT UP LY C RDBE ORE C ANG NG USE

TE EO M DE: 2 00 W @ 4 HM

2 70 W @ 8 HM

( O M IN O D)

RDGE MODE: 1000 W @ 8 OHM

( O M IN O D)

CASS 2 WI ING MAY E USED

Vocal MIC

POWER

ON OFF

VOL AGE SE ECTOR

AC INPUT

10012

00 1 0 AC 6 Hz

V C

20 2 0 AC 5 Hz

R T D OW R CO SU PTO : 5 W

22024

11 V

V C

22 V

1001 0V: 10A 25 V

US :

2202 0V: 6 3A 250V

CD Player

Synthesizers

Other stereo
line level signal

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POWERED MIXER
MODEL APM80 1500

M DEL

ERAL

BRIDGE MODE

Ap ara en ska l a sl tas

il or atu tag nar d n
nsl ts t l e t n verk

BRIDGE

2+ 1+

POS NEG

LEFT/MONO MAIN

OUTPUT 2

1+ 1­POS NEG

OUTPUT 2

OUTPUT 1

RIGHT/MONITOR

OUTPUT 1

1+ 1-

POS NEG

Cassette or DAT

LR

Monitor

18

5. TECHNICAL SPECIFICATION

Mono input channels

Microphone input
Frequency response
Distortion (THD & N)
Gain 50dB (MIC)

SNR (Signal to Noise Ratio)

Line input
Frequency response

Distortion (THD & N)
Gain

Stereo input channels

Line input
Frequency response
Distortion (THD & N)

Impedances

Microphone input
Channel Insert return
All other inputs
Tape out
All other output

Equalization

Hi shelving
Mid bell
Low shelving

DSP Section

A/D and D/A converters

DSP resolution
Type of effects

Presets
Controls

Main Mix Section

Noise (Bus noise) Fader 0 dB, channels muted: 85dBr (ref.:+4dBu)

Max output

AUX Sends max out

electronically balanced, discrete input configuration
10Hz to 55kHz, + 3dB

0.006% at 4dBu, 1kHz+

>90dB
electronically balanced
10Hz to 55kHz, 3dB

0.04% at 4dBu, 1kHz+

30dB

Unbalanced
10Hz to 55kHz, 3dB

0.006% at +4dBu, 1kHz

1.4kOhm

2.5kOhm
10kOhm or greater

1kOhm
120Ohm

15dB @12kHz

+
+

15dB @2.5kHz
15dB @ 80Hz

+

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

CLIP LED
MUTE SWITCH with LED indicator

Fader 0dB, all input channels assigned and set to
UNITY gain: 71dBr (ref.:+4dBu)

+27dBu balanced ,

22dBu unbalanced, 1/4" jacks+

+22dBu

+

+

19

Output Power

Power supply

Physical

APM80.1500

Main voltage

Fuse

Dimension (W D H)

Weight

Stereo mode: 680W(RMS) @ 4ohm

770W(EIAJ) @ 4ohm
429W(RMS) @ 8ohm

399W(EIAJ) @ 8ohm

Bridge mode: 1553W @ 8ohm

100 - 120VAC ~ 60Hz
220 - 240VAC ~ 50Hz
100 ~ 120V : T10A 250V
220 ~ 240V : T6.3A 250V

550mm 220mm 310mm
(8.66" 12.20" 21.65")

(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 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.

21

SEIKAKU TECHNICAL GROUP LIMITED

No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan

http://www.altoproaudio.com Tel: [phone]

email: [e-mail] Fax: [phone]

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 2007 SEIKAKU GROUP

c

NF 1.002706