Alto PBM4D User manual

User's Manual
PBM4D SISTEMA
www.altoproaudio.com
Version 1.3 NOV. 2007
LTO
R
English
PORTABLE PA SYSTEM

CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
IMPORTANT SAFETY INSTRUCTION
TO REDUCE THE RISK OF ELECTRIC SHOCK
PLEASE DO NOT REMOVE THE COVER OR
THE BACK PANEL OF THIS EQUIPMENT.
THERE ARE NO PARTS NEEDED BY USER
INSIDE THE EQUIPMENT. FOR SERVICE,
PLEASE CONTACT QUALIFIED SERVICE
CENTERS.
WARNING
To reduce the risk of electric shock
and fire, do not expose this equipment
to moisture or rain.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Dispose of this product should
notbeplacedinmunicipalwaste
and should be separate collection.
11.
12.
MovethisEquipmentonlywithacart,
stand, tripod, or bracket,
specified by the
manufacturer, or
sold with the
Equipment. When
a cart is used, use
caution when
moving the cart /
equipment
combination to
avoid possible
injury from tip over.
Permanent hearing loss may be caused by
exposure to \ extremely high noise levels.
The US. Government's Occupational Safety
and Health Administration (OSHA) has
specified the permissible exposure to noise
level.
These are shown in the following chart:
According to OSHA, an exposure to high SPL in
excess of these limits may result in the loss of
heat. To avoid the potential damage of heat, it is
recommended that Personnel exposed to
equipment capable of generating high SPL use
hearing protection while such equipment is
under operation.
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.
The apparatus shall be connected to a mains
socket outlet with a protective earthing
connection.
The mains plug or an appliance coupler is used
as the disconnect device, the disconnect device
shall remain readily operable.
CAUTION
Describes precautions that should be observed to
prevent damage to the product.
Read this Manual carefully before operation.
Keep this Manual in a safe place.
Be aware of all warnings reported
with this symbol.
Keep this Equipment away from water and
moisture.
Clean it only with dry cloth. Do not use
solvent or other chemicals.
Do not damp or cover any cooling opening.
Install the equipment only in accordance with
the Manufacturer's instructions.
Power Cords 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.
Unplug this equipment when unused for long
periods of time or during a storm.
Refer all service to qualified service personnel
only. Do not perform any servicing other than
those instructions contained within the
User's Manual.
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.
HOURS X DAY EXAMPLE
8
6
4
3
2
1,5
1
0,5
0,25 or less
SPL
90
92
95
97
100
102
105
110
115
Small gig
train
Subway train
High level desktop monitors
Classic music concert
Rock concert

1
IN THIS MANUAL:
1. INTRODUCTION
Thank you for purchasing the amazing portable PA system PBM4D SISTEMA.
This system is small enough to fit into any airplane's overhead storage
compartment yet being flexible and powerful enough to be used for small gigs
and professional multimedia presentations. PBM4D SISTEMA includes a 45+45
watt stereo amplifier, a 5-channel mixer, and 2x5" full range speakers. The chassis
is made by moulded polypropylene for shock and moisture protection.
Your PBM4D SISTEMA is the ideal tool for: Multimedia Presentations, Weddings,
Small Church Functions, Gym, Music Rehearsal, Small Gigs, School Functions,
and more .
Yo u r P B M 4 D
SISTEMA also includes a 24 Bit digital multieffect with 16 Factory Presets.
Enjoy your PBM4D SISTEMA and make sure to read this Manual carefully before
operation!
2. FEATURES
Modern design & Lightweight
2x5" full range speakers
3-band equalizer on input channels
5 Input channels with individual Volume control and 2 bands EQ
3 bands Master EQ
Compact moulded polypropylene case
2 RCA Line Inputs
2 RCA Line Outputs
Monitor/Headphone output
Monitor/Headphone level control
2 powered output (45+45 watt) for optional external speakers
3 XLR microphone Inputs with phantom power(+15V)
1. INTRODUCTION................................................................................1
2. FEATURES.......................................................................................1
4. CONTROL ELEMENTS......................................................................5
5. INSTALLATION & CONNECTION........................................................9
7. BLOCK DIAGRAM..........................................................................12
8. TECHNICAL SPECIFICATIONS...........................................................13
9. WARRANTY..................................................................................14
3. QUICK START..................................................................................3
6. PRESET LIST...................................................................................11
16-preset digital effect processor

SPOTLIGHT
2
OPERATING
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MIC IN (bal.) MIC IN (bal.) MIC IN (bal.)
IN
OUT
PRESETS
DSP
12
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AUX/DFX RET
10
0
DSP
MUTE
CLIP
MUTE
1. WARM HALL
2. BRIGHT HALL
3. WARM ROOM
4. BRIGHT ROOM
5. VOCAL 1
6. VOCAL 2
7. VOCAL 3
8. PLATE
9. STEREO DELAY1
10. STEREO DELAY2
11. REV + DELAY1
12. REV + DELAY2
13. REV + DELAY3
14. REV + DELAY4
15. REV + CHORUS1
16. REV + CHORUS2
PRESETS
BASS
MAIN POWER OUT
LTO
R
CH 1 CH 2 CH 3 CH 4
LINE IN (bal.) LINE IN (bal.) LINE IN (bal.)
PHANTOM
OFFON
+15dB +15dB +15dB +15dB
12KHz 12KHz 12KHz 12KHz
-15dB -15dB -15dB -15dB
0000
HIGH HIGH HIGH HIGH
+15dB +15dB +15dB +15dB
-15dB -15dB -15dB -15dB
0 0 000
000
LOW
80Hz
LOW
80Hz
LOW
80Hz
LOW
80Hz
+10dB
-
8
+10dB
-
8
+10dB
-
8
+10dB
-
8
+10dB
-
8
+10dB
-
8
+10dB
-
8
+10dB
-
8
0000
LEVEL LEVEL LEVEL LEVEL
MIDDLE HIGH
MAIN MONITOR
LEVEL
+10dB
-
8
+15dB
-15dB
0
+15dB
-15dB
0
+15dB
-15dB
0
MONITOR OUT
TAPE
( MIN. LOAD )
8
DSP/FX
AUX1
POST
DSP/FX
AUX1
POST
DSP/FX
AUX1
POST
DSP/FX
AUX1
POST
-30
-10
0
10
+10dB
-
8
0
PBM4D
SISTEMA

3. QUICK START
This is the fastest way to get something out from your PBM4D SISTEMA, if you have
akeyboardandamicrophone.
a. Well, there is not really much to say before starting to operate the PBM4D SISTEMA.
It includes Mixer, Amplifiers and Speakers, so just put it on a clean table first and
make sure that the Power switch on the back panel is on OFF position.
b. Turn down the Input Channel Gain Controls and the MAIN and MONITOR controls.
c. Keep Input Channel EQ and Master EQ controls in center position.
d. Only at this point you can connect the AC cable into an AC socket and you can
switch the system ON.
e. Now connect a microphone into Channel 1-3 or a Line Instrument into Channel 4.
f. Slowly turn up the Input Channel LEVEL Control and then the MAIN Control.
g. For an optimal sound reproduction make sure that the -10 and 0 LEDs on the
Master LED Meter are blinking.
Here you are. It is your first gig with your PBM4D SISTEMA..
3

OPERAT NG
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M C N bal ) M C N bal ) MIC IN (bal )
IN
OUT
PRESETS
DSP
12
3
4
5
7
8
9
10
1
12
13
1
5
16
AUX/DFX RET
10
0
DSP
MUTE
CL P
MUTE
1 WA M HA L
2 BRIGHT H LL
3 WA M ROOM
4 BRIGHT ROOM
5 VOCAL 1
6 VOCAL 2
7 VOCAL 3
8 PLATE
9 STEREO DEL Y1
10 STEREO DEL Y2
11 REV + DELAY1
12 REV + ELAY2
13 REV + ELAY3
14 REV + ELAY4
15 REV + HORUS1
16 REV + HORUS2
PRESETS
BASS
MA N POWER OUT
LTO
CH 1 CH 2 CH 3 CH 4
INE N bal ) L NE ( al ) L NE b l )
PHANTOM
OFFON
+15dB + 5dB +15 B +15dB
12KHz 12KHz 1 KHz 12KHz
1 dB 15dB 15dB 1 dB
0000
HIGH H GH HIGH HIGH
+15dB + 5dB +15 B +15dB
1 dB 15dB 15dB 1 dB
00 0 0 0000
LOW
80Hz
LOW
8 Hz
LOW
80Hz
LOW
80Hz
+10dB
8
+10dB
8
+1 dB
8
+10dB
8
+10dB
8
+1 dB
8
+10dB
8
+10dB
8
0000
LEVEL LEVEL LEVEL LEVEL
M DDLE HIGH
MAIN MONITOR
LEVEL
+ 0dB
8
+ 5dB
15dB
0
+15dB
15dB
0
+15dB
1 dB
0
MONITOR OUT
TAP E
( M N LOAD ) 8
DSP FX
AU 1
PO T
DSP/FX
UX1
POST
DSP FX
A X1
P ST
DSP FX
AU 1
PO T
0
0
0
10
+10dB
8
0
PBM4D SISTEMA
4
This will be typical setting for a Business Presentation making use of PowerPoint slides
and background music/effects generated by CD player, iPOD or other sources such as
Mp3 Players. The Presenter has up to 2 microphones available and a wireless microphone
can also be connected for the use of the audience. The entire presentation can be
recorder via Tape or DAT Recorder.
In this case up to three Musicians (Vocalist, Guitar Player and Keyboard Player) can
hookup to the PBM4D SISTEMA and an additional Drum Machine can also be connected
to the Stereo Channel. Two external passive speakers can be connected (the internal
speakers will be automatically be disconnected) as well as a powered stage Monitor.
HOOK
UP
MULTIMEDIA PRESENTATION
HOOK
UP
SMALL GIG WITH EXTERNAL SPEAKERS
Keyboard Player Drum Machine
Guitar
DAT Recorder
Powered Stage Monitor
Passive Speakers
MIC
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MIC IN (ba ) MIC IN (bal ) M C N bal )
IN
OUT
PRESETS
DSP
12
3
4
5
6
8
9
10
11
12
1
14
15
16
AUX/DFX RET
10
0
DSP
MUTE
CL P
MUTE
1 WARM HALL
2 BR GHT HALL
3 WARM ROOM
4 BR GHT ROOM
5 VOCAL 1
6 VOCAL 2
7 VOCAL 3
8 PL TE
9 ST REO ELAY1
0 ST REO ELAY2
1 REV + DE AY1
2 REV + DEL Y2
3 REV + DEL Y3
4 REV + DEL Y4
5 REV + CHORUS1
6 REV + CHORUS2
PRESETS
BASS
MAIN POWER OUT
LTO
CH 1 CH 2 CH 3 CH 4
L NE N (b l ) LINE N ba ) L NE bal )
PHANTOM
OFFON
+1 dB +15dB 15dB +1 dB
2KHz 12KHz 12KHz 2KHz
15dB 5dB 15 B 15dB
0000
H GH HIGH H GH H GH
+1 dB +15dB 15dB +1 dB
15dB 5dB 15 B 15dB
00 0 0 0000
LOW
80Hz
LOW
80Hz
LOW
0Hz
LOW
80Hz
+10 B
8
+10 B
8
+10dB
8
+ 0dB
8
+10 B
8
+10dB
8
+ 0dB
8
+10 B
8
0000
LEVEL LEVEL LEVEL LEVEL
MIDDLE H GH
MAIN MONITOR
LEVEL
+10dB
8
+15dB
1 dB
0
+15 B
5dB
0
+ 5dB
15dB
0
MON TOR OUT
TAPE
( MIN LOAD ) 8
DSP FX
UX1
OST
DSP FX
AU 1
PO T
DSP/ X
AUX1
POST
DSP FX
A X1
OST
30
10
0
10
+10 B
8
0
PBM4D SISTEMA
MIC1MIC2
Wireless MIC System
Laptop Computer
iPOD ,CD Player. MP3
Tape Recorder
Headphone

SPOTLIGHT
4. CONTROL ELEMENTS
2 PHANTOM POWER SWITCH
3 TAPE IN
4 TAPE OUT
5 LEVEL CONTROL
1 THE MONO INPUT CHANNELS
2
7
6
5
1
3
4
IN
OUT
CH 4
LEVEL
TAPE
PHANTOM
OFFON
5
These are marked CH1 to CH3 and include a
balanced XLR socket (MIC IN) and an unbalanced
1/4" socket (LINE IN). Use the XLR socket to
connect a low impedance balanced dynamic
microphone or a low level signal. You can also
connect a Condenser microphone into the XLR
socket (See following about Phantom Power).
Use the LINE IN socket to connect a Line Level
Instrument such as a keyboard or a drum machine.
You can also connect an electric guitar or bass
through an option DI Box (Direct Injection Box)
When the (2) switch is at ON position, a +15V
phantom power will be applied to CH1 through
CH3. Only Condenser microphones need Phantom
Power, so switch it OFF when you use dynamic
microphones.
Here you can connect a stereo Line Level via RCA
sockets. Usually this stereo channel will be used to
connect into the PBM4D SISTEMA with the audio
output of a Computer, or a CD Player, iPOD, MP3
player, etc.
Via these two RCA sockets you can route out the
Main Stereo signal usually to a Tape Recorder or
DAT Recorder.
It adjusts the LEVEL of individual channels with a range from to +10dB.
This control is used to adjust the level of respective channel signal sent to the
Auxiliary Bus. The configuration is post-fader so the signal sent to the AUX Bus
will be affected by the LEVEL control of that particular channel. In this typical
compact unit, the channel signal is not only assigned to external effect or
processor equipment directly but also to internal digital multi-effect.
6 DSP/FX-AUX
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MIC IN (bal.)
CH 1
LINE IN (bal.)
+15dB
12KHz
15dB
0
HIGH
+15dB
15dB
00
LOW
80Hz
+10dB
8
+10dB
8
0
LEVEL
DSP/FX
AUX1
POST

SPOTLIGHT
4. CONTROL ELEMENTS
This equalization circuit is inserted before the MAIN level control. You have available
3 controls: BASS, MIDDLE and HIGH.
8HIGH
9 MIDDLE
10 LOW
11 MONITOR OUT
10 9
MAIN POWER OUT
MONITOR OUT
12
11
8
THREE BANDS MASTER EQ
Turn the control down (from center position) if you experience rumble or low
frequency noise or turn it up to make the PBM4D SISTEMA sound much bigger
thanwhatitis.
Use it as a further boost to the overall MIX
togetmorecolourfromyourprogramor
turn the control down if you want to avoid
high frequency noise.
This is a unique control designed for a wide variation of middle frequencies. Turn
the control down (from center position) and you will make the human voice more
warm and smooth while turning the control up will enhance vocal intelligibility. Be
careful not to boost these frequencies too much to avoid feedback on microphone
inputs.
Connect a powered Monitor to this socket or
an external Amplifier + Monitor Speaker. You
can also use it to connect a pair of Headphones.
12 MAIN POWER OUT
You can connect a pair of passive speakers to
these Output sockets. In this case, the internal
speakers will be disconnected and the 45 watt
x 2 internal amplifier signal will be assigned to
these sockets.
7 CHANNEL EQ
Each Input channel has its own 2 bands equalizer with an adjustable range of
+/-15dB. The HIGH control creates a shelving filter that will boost/cut all
frequencies above 12kHz. You can use it to eliminate high frequency noise and
hiss (such as those produced by Tape Recorders) or to boost and make crispier
the cymbals or certain harmonics of the human voice. The LOW control will
create a shelving filter that will boost/cut frequencies below 80Hz. Use the
LOW control to put in evidence Kick Drum or enhance male voice.
6

13 MAIN
There is the Main Mix Control adjusting the overall volume assigned to the 2
internal speakers or to the MAIN POWER OUT speakers.
14 MAIN LED METER
This 4 segments LED Meter will monitor the volume assigned by the MAIN level
control. If the +10 LED flashes, you have reached the limit of the internal
45+45W amplifier and the outgoing signal is approaching distortion. +10 LED
should flash only occasionally. If no LED is blinking, it means that the output
levelistoolow,soeitheryoudonothearanymusicorthesignalistoolowto
the noise level. For optimal functioning LEDs marked -10 and 0 should always
be blinking.
15 MONITOR
Via this Control, you can adjust the signal
Level applied to the MONITOR OUT sockets.
16 OPERATING
This LED will blink when your PBM4D
SISTEMA is switched ON.
SPOTLIGHT
4. CONTROL ELEMENTS
13 15
14 16 2
DSP SECTION
Your PBM4D SISTEMA features a 24-bit,
16-presets digital multi-effects including reverbs, chorus, vocal and delay, ect.
Adjust this knob to select the desired
effect.
17 PRESETS
This control is used to adjust the
level of the signal coming from
internal multi-effect .
18 AUX/DFX RET
This switch is used to activate/deactivate the resident multi-effect.
19 DSP MUTE
20
19
PRESETS
DSP
12
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AUX/DFX RET
10
0
DSP
MUTE
CLIP
MUTE
1 WARM HALL
2 BRIGHT HALL
3 WARM ROOM
4 BRIGHT ROOM
5 VOCAL 1
6 VOCAL 2
7 VOCAL 3
8 PLATE
9 STEREO DELAY1
10 STEREO DELAY2
11 REV + DELAY1
12 REV + DELAY2
13 REV + DELAY3
14 REV + DELAY4
15 REV + CHORUS1
16 REV + CHORUS2
PRESETS
17
7
18

SPOTLIGHT
4. CONTROL ELEMENTS
21 POWER ON/OFF
22 AC INLET
This switch is used to turn the main power ON/OFF.
Use it to connect your PBM4D SISTEMA to the main AC with the supplied AC
cord. Please check the voltage available in your country and how the voltage for
your PBM4 SISTEMA is configured before attempting to connect your PBM4D
SISTEMA to the main AC.
REAR PANEL
20 CLIP/MUTE
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.
8
AC~230V
50/60Hz
FUSE 2A
ONPOWER
OFF
21 22

Ok, you have got to this point and you are now in the position to successfully operate
your PBM4D SISTEMA. However, we advise you to read carefully the following section to
be the real master of your own mix. Not paying enough attention 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:
1. Turn down all Input and output gain controls.
2. Connect phantom powered microphones before switching on the +15Volt phantom
power switch.
3. Set the output level of your PBM4D SISTEMA or the connected power amplifier at
no more than 75%.
4.Now,settheMONITORlevelatnomorethan50%.Inthiswayyouwillbeableto
hear later what you are doing connecting a pair of headphones or a pair of powered
studio monitor speakers.
5. Position EQ controls on middle position.
6. Increase the input gain properly for maintaining the good headroom and ideal dynamic
range.
7. Depending on the actual application, turn slowly the input and output level controls
for obtaining the maximum gain before distortion.
8. 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.
Strain Clamp
Sleeve Tip
Ring
Sleeve Ground/Screen
Ring Right S gnal
Tip Left Signal
Use for Headphone
1/4" Stereo (TRS) Jack Plug
Strain Clamp
Sleeve Tip
Sleeve Ground/Screen
Tip S gnal
Use for Mono Line In Mono 1/4"Jack Plugs
1/4" Mono (TS) Jack Plug
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow
these schematics.
Audio Connections
5. INSTALLATION AND CONNECTION
9

10
Strain Clamp
Sleeve Tip
Ring
Sleeve Ground/Screen
Ring Return Signal
Tip Send Signal
Use for Insert Points
1/4" Stereo (TRS) Jack Plug
2 Hot(+)
3 Cold(-)
1 Ground/Screen
(seen from soldering side)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
3 pin XLR Male Plug
2 Hot(+)
3 Cold(-)
1 Ground/Screen
3 pin XLR Line Socket
(seen from soldering side)
1
2
3
1
2
3
5. INSTALLATION AND CONNECTION
1+
2+
1-
2-
Speakon connector
Use for Main output
(For unbalanced use, leave pin3 unconnected)
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-.
MAIN SPEAKERS CONNECTION

6. PRESET LIST
Controllable Parameter
WARM HALL Rev.decay time
Pre delay
BRIGHT HALL
Simulate a small acoustic space of the sound.
WARM ROOM
BRIGHT ROOM
VOCAL1
VOCAL2
VOCAL3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NO. Preset Description
Chorus rate
Rev.decay time
Parameter Variable range
360ms
45ms
290ms
23ms
210ms
45ms
210ms
23ms
450ms
240ms
25ms
100ms
114ms
290ms
10ms
352ms
238ms
Period
326ms
290ms
Decay period
Rev.decay time
277ms
150ms
3.02Hz
150ms
Simulate a large acoustic space of the sound.
Simulate a small acoustic space of the sound.
Simulate a studio room with many early reflections
Recreate the input sound on the stereo output
with different time.
STEREO DELAY 1
Simulate a room with delay time.
Simulate a room with small delay time.
Simulate a small space with slight decay time.
Simulate the transducers sound like classic bright
vocal plate.
PLATE
Recreate the input sound on the stereo output with
different time.
STEREO DELAY 2
Delay with room effect.
Delay with room effect.
Delay with room effect.
Delay with room effect.
Stereo chorus and large room reverb.
REV + DELAY 1
REV + DELAY 2
REV + DELAY 3
REV + DELAY 4
REV + CHORUS1
REV + CHORUS2
Stereo chorus and large room reverb
Rev.decay time
Pre delay
Rev.decay time
Pre delay
Rev.decay time
Pre delay
Rev.decay time
Pre delay
Rev.decay time
Pre delay
Rev.decay time
Pre delay
Rev.decay time
Period
Decay period
Rev.decay time
Decay period
Rev.decay time
Decay period 375ms
Rev.decay time 210ms
Chorus rate
Rev.decay time
211ms
240ms
3.67Hz
290ms
11

7. BLOCK DIAGRAM
12345678
A B C
D
8
7
6
5
4
3
2
1
D
C B A
2 1 3
+15V
PHANTOM
[-40/-20dB]
[-30/-10dB]
LOW-Z
HI-Z
BLOCK D AGRAM
[10dB]
[-10dB]
2-STAGE EQ
LOW HI
LEVEL
DFX SEND
DFX(DSP)
[0dB]
[-6dB]
CH INPUT
(CH1-3)
DFX (DSP)
OFF
ON
HA
ALTO PBM4D -MX
MAIN BUSMA N BUS
FX RETURN
MA N BUS
3c 5e 1a 4d 2b
T
R
S
RN
TN
DSP BOARD
PRESETS
MUTE
DSP FOOTSWITCH
AUX/DFX RET
DFX SEND
POWER AMPLIFIER
MA N BUS
1
AUX SEND2
T
R
S
S
2
T
R
S
MAIN BUS
TA PE I N
2-TRACK
MONITOR OUT
T
R
S
MON ITOR L EVEL
TA PE O UT
2TK IN
LEVEL
OUTPUT
MA N LEVEL
3-BAND EQ
LOW
MID
HI
(4POINT)
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Fader 0 dB, channels muted: 85 dBr (ref.: +4 dBu)
Fader 0 dB, all input channels assigned and set to
Europe 210 240V~, 50 Hz
USA/Canada 100 120V~, 60 Hz
U.K./Australia 240V~, 50Hz
UNITY gain: 81 dBr(ref.: +4 dBu)
+22 dBu unbalanced, 1/4"jacks
21 0 240V~: T2A
100 120V~: T4A
25 Hz 20 kHz
133 watts
12.6 Kg
8 ohm
14.45 Kg
Frequency Response
Power Consumption
Output Impedance
Noise(Bus noise)
Monitor max out
Amplifier Section
Gross Weight
Main voltage
Power supply
Dimension
Net Weight
Equalization
Impedances
Physical
Fuse
Output Power 45W x 2 RMS (Nominal power) 66W x 2(EIAJ)
Low shelving +/ 15 dB@80 Hz
Hi shelving +/ 15 dB@12 kHz
All other outputs 120 Ohm
Tape out 1 kOhm
All other inputs 10 kOhm or greater
Channel Insert return 2.5 kOhm
Microphone Input 1.4 kOhm
Electronically balanced
Line input
Frequency response 10 Hz to 55 kHz, +/ 3 dB
Distortion(THD&N) 0.05% at +4 dBu, 1 kHz
Gain 10 dB
SNR(Signal to Noise Ratio)
>94 dB
Gain 30 dB
Distortion(THD&N) 0.05% at +4 dBu, 1 kHz
Frequency response 10 Hz to 55 kHz, +/ 3 dB
Electronically balanced, discrete input configuration
Microphone Input
Input channels
216.5x143.5 152.5mm(L W H)(8.5" 5.6" 6")xxxxx
A/D and D/A converters 24bit
DSP Section
DSP resolution 24bit
Type of effects
REV+DELAY, and REV+CHORUS combinations
HALL, ROOM, VOCAL, PLATE, STEREO DELAY
Presets 16
Controls 16 position PRESET selector
CLIP LED
MUTE SWITCH with LED indicator
Main Mix Section
FX Sends max out +22 dBu
8. TECHNICAL SPECIFICATION
13

9. WARRANTY
1. WARRANTY REGISTRATION CARD
To obtain Warranty Service, the buyer should first fill out and return the enclosed
Warranty Registration Card within 10 days of the Purchase Date.
All the information presented in this Warranty Registration Card gives the
manufacturer a better understanding of the sales status, so as to provide 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
LT O
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, may repair or replace this product at its
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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 be liable for any incidental or consequential damages.
LT O
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.
14

c
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
SEIKAKU TECHNICAL GROUP LIMITED
NO. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan
http://www.altoproaudio.com Tel: [phone]
email: [email protected] Fax: [phone]
NF02056 1.3