R
LTO
OWNER'S MANUAL
PBM4
COMPACT POWERED MIXER
www.altoproaudio.com
Version 1.2 OCTOBER 2007
English
IMPORTANT SAFETY INSTRUCTION
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
Dispose of this product should
not be placed in municipal waste
and should be separate collection.
11. Move this Equipment only with a cart,
stand, tripod, or bracket,
This symbol, wherever used, alerts you to the
specified by the
presence of un insulated and dangerous voltages
manufacturer, or
within the product enclosure. These are voltages that
sold with the
may be sufficient to constitute the risk of electric
Equipment. When
shock or death.
a cart is used, use
This symbol, wherever used, alerts you to
caution when
important operating and maintenance instructions.
moving the cart /
Please read.
equipment
Protective Ground Terminal
combination to
AC mains (Alternating Current)
avoid possible
Hazardous Live Terminal
injury from tip over.
ON: Denotes the product is turned on.
12. Permanent hearing loss may be caused by
OFF: Denotes the product is turned off.
exposure to \ extremely high noise levels.
CAUTION
The US. Government's Occupational Safety
Describes precautions that should be observed to
and Health Administration (OSHA) has
prevent damage to the product.
specified the permissible exposure to noise
1. Read this Manual carefully before operation.
level.
2. Keep this Manual in a safe place.
These are shown in the following chart:
3. Be aware of all warnings reported
with this symbol.
HOURS X DAY SPL EXAMPLE
4. Keep this Equipment away from water and
90 Small gig
8
moisture.
92 train
6
5. Clean it only with dry cloth. Do not use
95 Subway train
4
solvent or other chemicals.
97 High level desktop monitors
3
6. Do not damp or cover any cooling opening.
100 Classic music concert
2
Install the equipment only in accordance with
102
1,5
the Manufacturer's instructions.
105
1
7. Power Cords are designed for your safety. Do
110
0,5
not remove Ground connections! If the plug
0,25 or less 115 Rock concert
does not fit your AC outlet, seek advice from
a qualified electrician. Protect the power
According to OSHA, an exposure to high SPL in
cord and plug from any physical stress to
excess of these limits may result in the loss of
avoid risk of electric shock. Do not place
heat. To avoid the potential damage of heat, it is
heavy objects on the power cord. This could
cause electric shock or fire.
recommended that Personnel exposed to
equipment capable of generating high SPL use
8. Unplug this equipment when unused for long
hearing protection while such equipment is
periods of time or during a storm.
under operation.
9. Refer all service to qualified service personnel
only. Do not perform any servicing other than
The apparatus shall be connected to a mains
those instructions contained within the
socket outlet with a protective earthing
User's Manual.
connection.
10. 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.
The mains plug or an appliance coupler is used
as the disconnect device, the disconnect device
shall remain readily operable.
IN THIS MANUAL:
1.
2.
3.
4.
5.
6.
7.
8.
9.
INTRODUCTION........................................................................1
FEATURES...............................................................................1
QUICK START...........................................................................3
CONTROL ELEMENTS...............................................................5
INSTALLATION & CONNECTION................................................10
PRESET LIST...........................................................................12
BLOCK DIAGRAM...................................................................13
TECHNICAL SPECIFICATIONS....................................................14
WARRANTY...........................................................................15
1. INTRODUCTION
Thank you for your purchasing of the LTO PBM4 compact mixer with digital
multieffect and 140 watt amplifier built in. It is just one of the many LTO
products that a talented, multinational Team of Audio Engineers and Musicians
have developed with their great passion for music. Your PBM4 is a remarkable
and unique equipment that doesn't find equals in the market of compact
powered mixing consoles. With enough microphone and Line-level inputs for
serious, small live performances, your PBM4 also includes a 24 Bit digital
multieffect with 16 Factory Presets. The built-in amplifier is capable to deliver
200 watt in total.
Enjoy your PBM4 and make sure to read this Manual carefully before operation!
2. FEATURES
70W x 2@4 ohm, offering high power and high dynamic range
7-band graphic EQ on Master
4 MIC/line input channels with balanced XLR and TRS inputs
Ultra-low noise discrete MIC pre-amps with +15V phantom power
2-band EQ on mono input channels
FX send for built-in or external effects
Separate output for stage monitor
Tape in/out with level control
16-preset digital effect processor
1
8
8
M
+10dB
AUX1
POST
+10dB
+10dB
+10dB
CH 1
CH 5-6
MIC IN (bal.)
TAPE OUT
3
P
3
CH 4
TAPE IN
LEVEL
+10dB
MIC IN (bal.)
OFF
ON
PHANTOM
-
MONITOR
-
0
dB
CH 3
1
RE
A
LINE IN (bal.)
LOW NOISE P
2
80Hz
DSP/FX
+15dB
LOW
+15dB
LEVEL
0
dB
0dB
0dB
MIC IN (bal.)
1
-
-
-15dB
-15dB
CH 2
P
MIC IN (bal.)
2
RE
A
LINE IN (bal.)
LOW NOISE P
P
3
1
M
P
3
2
AUX1
POST
+10dB
LEVEL
0
dB
80Hz
DSP/FX
+15dB
LOW
+15dB
M
1
RE
A
LINE IN (bal.)
LOW NOISE P
-
-
0dB
0dB
12KHz
HIGH
M
2
8
RE
A
+10dB
+10dB
AUX1
POST
-15dB
-15dB
8
LINE IN (bal.)
8
8
LEVEL
0
dB
80Hz
DSP/FX
+15dB
LOW
+15dB
0dB
2.5K
6.3K
16K
14
12
13
11
15
9
1
8
2
7
3
6
5
4
0
10
CLIP
2
-30
-10
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
WARM HALL
BRIGHT HALL
WARM ROOM
BRIGHT ROOM
VOCAL 1
VOCAL 2
VOCAL 3
PLATE
STEREO DELAY1
STEREO DELAY2
REV + DELAY1
REV + DELAY2
REV + DELAY3
REV + DELAY4
REV + CHORUS1
REV + CHORUS2
PRESETS
MONITOR OUT
MUTE
AUX/DFX RET
DSP
MUTE
POWER AMPLIFIER
OUTPUT
1
PRESETS
10
16
DSP
15
1K
15
400
9
9
160
0
0
63
9
9
0
15 10
15
R
LTO
LEVEL
+10dB
FOOTSWITCH
FX RETURN
FX SEND
-
0
dB
OPERATING
MAIN
PBM4
8
LOW NOISE P
-
-
0dB
0dB
8
+10dB
+10dB
AUX1
POST
-15dB
-15dB
12KHz
HIGH
8
LEVEL
80Hz
DSP/FX
+15dB
LOW
+15dB
0dB
8
-
0
dB
0dB
0dB
12KHz
HIGH
8
-
-15dB
-15dB
12KHz
0dB
IG
HIGH
OT
L
0dB
SP
HT
2
3. QUICK START
This is the fastest way to get something out from your PBM4, if you have a
keyboard and a microphone.
a. Before connecting microphones or instruments, make sure that the power
of all your systems components including your PBM4 is turned off. Also,
make sure that all input and output controls are turned down. This will
avoid damage to your speakers and excessive noise.
b. Properly connect all external equipments such as microphone, processors,
speakers etc.
c. Now, turn on the power of any peripheral devices, and then connect your
. PBM4 to the AC socket.
Note: Powered monitors or power amplifiers shall be turned ON after the
PBM4 is on and OFF before turned the PBM4 off.
d. Set the output level of your PBM4 at no more than 75%.
e. Set HI, and LOW EQ controls on center position.
f. Set the Master EQ slider on center position .
g. Set panoramic (PAN/BAL) control on center position.
h. While speaking into the microphone (or playing the instrument) at normal
volume, adjust the channel Level control so that you wouldn't hear any
distortion.
i. You can shape the tone of each channel by adjusting the equalizer controls
as desired.
j. 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 LEVEL control.
HOOK
PBM4 IN CONFERENCE
UP
Wireless
Microphone 1
0dB
0dB
dB
HIGH
0dB
H GH
12KHz
+15dB
15dB
H GH
12KHz
15dB
5dB
LOW
MAIN
0
B
0dB
LOW
PBM4
1 KHz
+1 dB
15 B
0dB
LOW
LTO
HIGH
2KHz
+ 5dB
1 dB
0dB
dB
LOW
15
15 10
9
9
OPER TING
8 Hz
5dB
+15dB
80Hz
15 B
+ 5dB
0dB
dB
+1 dB
0dB
0dB
DSP/FX
DSP FX
AUX1
POST
DSP FX
UX1
OST
DSP FX
AU 1
PO T
AUX1
PO T
+ 0dB
MONITOR
0
0
9
0
B
+ 0dB
0
d
LEVEL
+1 dB
8
+ 0dB
8
8
8
8
10dB
LEVEL
LEVEL
PHANTOM
+ 0dB
LEVEL
ON
160
400
1
16
1
2
1K
2 5K
6 3K
MUTE
4
5
3
LINE N ( al )
RE
A
INE N (b l )
LOW NO SE P
L NE N b l )
OW NO SE P
RE
L NE IN ba )
OW OI E P
E
TAP
N
11
7
10
9
8
PRESETS
EA
0
10
AUX/DFX RET
+ 0dB
16K
PRESETS
CL P
DSP
MUTE
3
14
12
LOW NO SE P
LEVEL
-3
63
DSP
+10dB
LEVEL
0
B
-1
15
+1 dB
8
10dB
8
0
B
8
+10dB
8
0
dB
0
9
15
8
MIC
80Hz
1 dB
15dB
8
0Hz
15dB
1 W RM ALL
2
RI HT HALL
3 W RM OOM
4
RI HT ROOM
5 OCAL 1
6 OCAL 2
7 OCAL 3
8 LA E
9 TER O ELA 1
10 TER O ELA 2
11
EV + DE AY1
12
EV + DEL Y2
13
EV + DEL Y3
14
EV + DEL Y4
15
EV + CHOR S1
16
EV + CHOR S2
FX SEND
M
M
M
M
FX RETURN
1
M C N bal )
MIC IN bal )
M C IN (b l )
M C N (ba )
APE OU
CH 1
CH 2
CH 3
CH 4
CH 5 6
POWER AMPLIF ER
OUTPUT
Main Speakers
2
MON
R OUT
FOOTSW TCH
MULTIMEDIA
PRESENTATION
Wireless
Microphone 2
CD Player
3
Tape Recorder
Secondary Speaker
HOOK
PBM4 IN SMALL GIG
UP
Drum Machine
0 B
0dB
0dB
H GH
0dB
H GH
12KHz
+15dB
5dB
H GH
12KHz
15dB
5dB
0 B
1 KHz
+1 dB
15dB
0dB
LOW
MAIN
0
B
0dB
LOW
PBM4
LTO
HIGH
2KHz
+ 5dB
1 dB
0dB
LOW
LOW
15
15 10
9
9
OPER TING
0dB
DSP FX
0
B
MONITOR
AUX1
POST
+ 0dB
8
0
dB
DSP FX
AU 1
PO T
10dB
+ 0dB
0
dB
0
0
9
9
15
15
LEVEL
+ 0dB
8
LEVEL
PHANTOM
LEVEL
160
400
16
1
1
2
1K
2 5K
6 3K
PRESETS
1 W RM ALL
2
RIG T HALL
3 W RM OOM
4
RIG T ROOM
5 OCAL 1
6 OCAL 2
7 OCAL 3
8 LATE
9 TER O D LA 1
10 TER O D LA 2
11
EV + DEL Y1
12
EV + DEL Y2
13
EV + DEL Y3
14
EV + DEL Y4
15
EV + CHORU 1
16
EV + CHORU 2
MUTE
4
5
1
12
INE N ( al )
LOW NO SE P
INE N (b l )
LOW NO SE P
RE
A
L NE N ba )
OW NO SE P
RE
TAP
L NE IN ba )
L W OI E P
R
E
7
11
N
10
9
8
0
PRESETS
EA
0
AUX/DFX RET
M
M
M
M
HOOK
MIC N bal )
MIC IN ( al )
M C IN (b l )
M C N (ba )
APE OU
CH 1
CH 2
CH 3
CH 4
CH 5 6
Keyboard
FX SEND
FX RETURN
1
Wireless
Microphone
+ 0dB
16K
CL P
DSP
MUTE
3
14
ON
LEVEL
-30
63
+1 dB
8
+ 0dB
8
8
8
10dB
LEVEL
0
B
-10
+1 dB
DSP
+10dB
LEVEL
0
8
A X1
OST
8
0
dB
+1 dB
0dB
DSP FX
UX1
POST
+10dB
80Hz
15dB
+ 5dB
0dB
DSP/FX
8
MIC
0 B
80Hz
1 dB
15dB
8
Guitar
8 Hz
5dB
+15dB
8
0Hz
5dB
Main Speakers
2
POWER AMPLIF ER
OUTPUT
MON
R OUT
FOOTSW TCH
Stage Monitor
Tape Recorder
CD Player
PBM4 IN BAR-PUB
UP
Zone 3 Speakers
Wireless
Microphone
0dB
dB
0 B
HIGH
0dB
HIGH
1 KHz
+1 dB
15 B
H GH
12KHz
+15 B
15dB
0dB
OW
MAIN
0
dB
0dB
LOW
PBM4
12KHz
15dB
5dB
0 B
LOW
LTO
H GH
12KHz
+15dB
5dB
dB
LOW
15
15 10
9
9
0
0
OPERAT NG
0Hz
dB
0 B
DSP FX
DSP/FX
AUX1
POST
0
dB
+10 B
DSP FX
AUX1
POST
8
8
8
MIC
+1 dB
15dB
0dB
DSP/FX
AUX1
POST
0
dB
8 Hz
5dB
+15dB
0
dB
+10dB
A X1
OST
0
dB
+10dB
MONITOR
9
9
15
15
LEVEL
10dB
LEVEL
PHANTOM
+10dB
LEVEL
ON
160
400
15
6
1
L NE IN ba )
RE
A
L NE IN bal
LOW NOI E P
RE
A
INE N ( al )
LOW NO SE P
RE
A
INE N (b l )
LOW NO SE P
TAP
N
RE
1K
2 5K
6 3K
C IP
DSP
MUTE
2
MUTE
4
1
5
13
6
12
OW OI E P
LEVEL
30
63
8
+10dB
8
8
8
8
+10 B
LEVEL
0
dB
10
10dB
DSP
+1 dB
LEVEL
0
8
0dB
0Hz
5dB
+15 B
8
15dB
+1 dB
8
80Hz
15 B
1
7
10
9
8
0
10
AUX DFX RET
1
2
PRESETS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
WARM HALL
BR GHT HA L
WARM ROOM
BR GHT ROOM
VOCAL 1
VOCAL 2
VOCAL 3
PL TE
ST REO DEL Y1
ST REO DEL Y2
REV + D LAY1
REV + D LAY2
REV + D LAY3
REV + D LAY4
REV + CH RUS1
REV + CH RUS2
FX SEND
Power Amplifier
FX RETURN
M
M
M
M
PRESETS
+10dB
16K
M C N (ba )
M C N bal )
MIC N bal )
MIC IN ( al )
APE OU
CH 1
CH 2
CH 3
CH 4
CH 5 6
POWER AMPL FIER
OUTPUT
MONIT
OUT
TV SCREEN
FOOTSWITCH
Audio Form
Screen TV
Keyboard
Drum
Machine
CD Player
Tape
Recorder
Zone 1
Speakers
Zone 2
Speakers
4
SP
OT
L
IG
4. CONTROL ELEMENTS
HT
INPUT SECTION
1 MONO MIC/LINE CHANNELS
HIGH
12KHz
+15dB
15dB
0dB
LOW
6
80Hz
15dB
+15dB
0dB
DSP/FX
AUX1
POST
8
4
0
dB
+10dB
3
8
+10dB
LEVEL
1
LINE N (bal )
LOW NOISE P
RE
A
P
NOTE: Never try to connect a line-level signal to
the XLR MIC input when the phantom power is
engaged or you may seriously damage your equipment.
0dB
5
M
Your PBM4 is equipped with 4 low-noise,
microphone preamplifiers with optional phantom
power supplying +15 Volt. You can connect
almost any type of microphone. Dynamic
microphones do not need phantom power. Use
phantom power only with condenser microphones
but make sure that the phantom power button
is disengaged before connecting the microphone.
Phantom power will not damage your dynamic
microphones but it may damage tube or ribbon
microphones so make sure to read the microphone
instructions manual before engage phantom power.
Use switch (2) to activate/deactivate phantom
power. These two channels are also equipped with
1/4" TRS balanced/unbalanced plugs to connect
line-level instruments such as keyboards, drum
machines and effect devices.
2
1
3
MIC IN (bal.)
CH 1
2 +15V PHANTOM POWER SWITCH
This switch will apply +15 Volt Phantom Power only to the 4 XLR inputs
sockets.
3 LEVEL CONTROL
This control is used to adjust the overall level of respective channel. The
adjustable range goes from - to +10dB. .
4 DSP/FX-AUX
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 multieffect.
EQUALIZATION
You have two EQ controls for each mono input channel each providing +/-15 dB
of boost and cut. The signal will be unaffected when the controls are on center
position.
5
OT
L
IG
4. CONTROL ELEMENTS
HT
5 HI
If you turn this control up, you will boost all the
frequencies above 12 kHz (shelving filter). You
will add transparency to vocals and guitar and
also make cymbals crispier. Turn the control
down to cut all frequencies above 12 KHz. In
such way, you can reduce sibilances of human
voice or reduce the hiss of a Tape player.
10
If you turn this control up, you will boost all
frequencies below 80 Hz. You will give more
punch to bass drums and bass guitar; and
you will make the male vocalist more "macho".
Turn it down and you will cut all the frequencies
below 80 Hz. In this way, you can avoid
low-frequency vibrations and resonance thus
preserving the life of your woofers.
+10dB
MONITOR
9
8
6 LOW
0
dB
8
SP
PHANTOM
2
+10dB
LEVEL
ON
OFF
TAPE IN
7
8
TAPE OUT
CH 5-6
7 TAPE IN
Your PBM4 features dual RCA jacks (left and right). If you wish to listen to
your monitor from a tape recorder, DAT or cassette, please use these tape
input jacks. You can connect the outputs of a CD Player, MP3 Player, iPOD or
another line-level stereo source to these RCA sockets and adjust the level
control. It is a very useful extra stereo channel.
8 TAPE OUT
Via these jacks, you can route the main out signal into a tape recorder or DAT
to record your event.
9 LEVEL
This knob will control the level of the signal applied to TAPE IN RCA input.
10 MONITOR
This knob will control the level of the signal sent to the monitor output
11 GRAPHIC EQ
Your PBM4 is equipped with a 7-bands graphic equalizer. Via these faders, you
can boost or attenuate the selected frequency by 15dB at a preset bandwidth.
When all faders are on center position, the signal will be unaffected.
6
SP
OT
L
IG
4. CONTROL ELEMENTS
HT
12 MAIN LEVEL
This control sets the amount of signal simultaneously sent to the MAIN MIX
OUTPUT and TAPE OUT.
MAIN
15
15 10
9
9
0
0
14
OPERATING
11
9
9
15
15
0
13
0
dB
-10
LEVEL
12
8
-30
63
160
400
1K
2.5K
6.3K
+10dB
16K
13 LED METER
This meter has 4 leds with range of 30 dB to +10 dB (CLIP). The 0 led
corresponds to a level output of 0 dBu.The +10 led comes to life when the
output reaches +10 dBu. Set the MAIN LEVEL control so that the 10 led
only flashes occasionally. In general you get a good mix level when the Meter
leds operates in the range 10 to 0. If you exceed 0, you will get distortion.
If even 30 leds are sleeping your signal-to-noise ratio will suffer.
14 OPERATING
This LED indicates when your PBM4 is switched-on.
MASTER SECTION AND CONNECTIONS
22
DSP
15
16
1
2
MUTE
3
4
5
13
6
12
11
21
CLIP
DSP
MUTE
14
20
23
7
10
9
8
PRESETS
0
10
AUX/DFX RET
PRESETS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
WARM HALL
BRIGHT HALL
WARM ROOM
BRIGHT ROOM
VOCAL 1
VOCAL 2
VOCAL 3
PLATE
STEREO DELAY1
STEREO DELAY2
REV + DELAY1
REV + DELAY2
REV + DELAY3
REV + DELAY4
REV + CHORUS1
REV + CHORUS2
18
FX SEND
19
FX RETURN
1
7
2
POWER AMPLIFIER
OUTPUT
MONITOR OUT
FOOTSWITCH
15
16
17
SP
OT
L
IG
4. CONTROL ELEMENTS
HT
15 POWER AMPLIFIER OUTPUT
The TWO jacks are used to output the main mix signal into external passive
speakers.
16 MONITOR OUTPUT
This jack is used to connect the input of external active monitor speaker or
power amplifier. If you connect a stereo amplifier you can use it in PARALLEL
MONO Mode. In this way you will use only one input channel of the amplifier
but you still have available 2 separate output channels each one with its own
volume control.
17 FOOTSWITCH
You can connect an optional external footswitch to turn on/off the onboard
multieffects module. It is a 1/4 " phone jack.
18 FX SEND
This 1/4" phone socket is used to send out the signal from the AUX bus of
the input channels into external devices such as effect units.
19 FX RETURNS
You can use this stereo 1/4" phone socket to return the signal of an effect
unit to the Main Mix. Alternatively you can use IT as an extra auxiliary input
using the AUX RETURN level control as volume control.
DSP SECTION
Your PBM4 features a 24-bit, 16-presets digital multieffects including reverbs,
chorus, vocal and delay, etc.
20 PRESETS
Adjust this knob to select the desired effect.
21 AUX/DFX RET
This control is used to adjust the level of the return signal coming from
external/internal multieffect effect. The signal of the AUX RETURN will be
sent to MAIN MIX OUTPUT. If you connect a sound source to the FX RETURN
input such as CD Players, etc, you can use this knob to control the input level
of such source.
22 DSP MUTE
This switch is used to activate/deactivate the resident multieffect. Alternatively,
you can also use the FOOTSWITCH jack.
8
SP
OT
L
IG
4. CONTROL ELEMENTS
HT
23 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.
REAR PANEL
24 POWER ON/OFF
This switch is used to turn the main power ON/OFF.
25 AC INLET with FUSE 2A
Use it to connect your PBM4 to the main AC with the supplied AC cord.
Please check the voltage available in your country and how the voltage for
your PBM4 is configured before attempting to connect your PBM4 to the
main AC.
POWER
ON
OFF
24
9
FUSE 2A
AC~230V
50/60Hz
25
5. INSTALLATION AND CONNECTION
Ok, you have got to this point and you are now in the position to successfully operate
your PBM4. 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:
1. Turn down all Input and output gain controls.
2. Connect phantom powered microphones before switching on the +15 Volt
phantom power switch.
3. Set the output level of your PBM4 or the connected power amplifier at no more
than 75%.
4. 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.
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.
Audio Connections
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow
these schematics.
Sleeve
Tip
Ring
Ring Right Sgnal
Stran Clamp
Tip Left Sgnal
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
10
5. INSTALLATION AND CONNECTION
Sleeve
Ring Return Signal
Tip
Ring
Strain Clamp
Tip Send Signal
Sleeve Ground/Screen
Use for Insert Points
1/4" Stereo (TRS) Jack Plug
2 Hot(+)
2
3
1
1 Ground/Screen
2
2 Hot(+)
3
1
1 Ground/Screen
3 Cold(-)
3 Cold(-)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
Use for Main output
(For unbalanced use, leave pin3 unconnected)
3 pin XLR Male Plug
3 pin XLR Line Socket
(seen from soldering side)
(seen from soldering side)
MAIN SPEAKERS CONNECTION
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
11
6. PRESET LIST
NO.
Preset
Description
Controllable Parameter
Parameter
Variable range
1
WARM HALL
Simulate a small acoustic space of the sound.
Rev.decay time
Pre delay
360ms
45ms
2
BRIGHT HALL
Simulate a large acoustic space of the sound.
Rev.decay time
Pre delay
290ms
23ms
3
WARM ROOM
Simulate a small acoustic space of the sound.
Rev.decay time
Pre delay
210ms
45ms
4
BRIGHT ROOM
Simulate a studio room with many early reflections
Rev.decay time
Pre delay
210ms
23ms
5
VOCAL1
Simulate a room with delay time.
Rev.decay time
450ms
6
VOCAL2
Simulate a room with small delay time.
Rev.decay time
Pre delay
240ms
25ms
7
VOCAL3
Simulate a small space with slight decay time.
Rev.decay time
Pre delay
100ms
114ms
8
PLATE
Simulate the transducers sound like classic bright
vocal plate.
Rev.decay time
Pre delay
290ms
10ms
9
STEREO DELAY 1
Recreate the input sound on the stereo output
with different time.
Period
352ms
10
STEREO DELAY 2
Recreate the input sound on the stereo output with
different time.
Period
238ms
11
REV + DELAY 1
Delay with room effect.
Delay period
Rev.decay time
326ms
290ms
12
REV + DELAY 2
Delay with room effect.
Decay period
Rev.decay time
211ms
240ms
13
REV + DELAY 3
Delay with room effect.
Decay period
Rev.decay time
375ms
210ms
14
REV + DELAY 4
Delay with room effect.
Decay period
Rev.decay time
277ms
150ms
15
REV + CHORUS1
Stereo chorus and large room reverb
Chorus rate
Rev.decay time
3.67Hz
290ms
REV + CHORUS2
Stereo chorus and large room reverb
Chorus rate
Rev.decay time
3.02Hz
150ms
12
7. BLOCK DIAGRAM
13
8. TECHNICAL SPECIFICATION
Input channels
Microphone Input
Frequency response
Distortion(THD&N)
Gain
SNR(Signal to Noise Ratio)
Line input
Frequency response
Distortion(THD&N)
Gain
Impedances
Microphone Input
Channel Insert return
All other inputs
Tape out
All other outputs
Equalization
Hi shelving
Low shelving
DSP Section
A/D and D/A converters
DSP resolution
Type of effects
Presets
Controls
Main Mix Section
Noise(Bus noise)
Monitor max out
FX Sends max out
Amplifier Section
Output Power
Frequency Response
Output Impedance
Power Supply
Main voltage
Power Consumption
Fuse
Physical
Dimension
Net Weight
Gross Weight
Electronically balanced, discrete input configuration
10 Hz to 55 kHz, +/ 3 dB
0.05% at +4 dBu, 1 kHz
30 dB
>94 dB
Electronically balanced
10 Hz to 55 kHz, +/ 3 dB
0.05% at +4 dBu, 1 kHz
10 dB
1.4 kOhm
2.5 kOhm
10 kOhm or greater
1 kOhm
120 Ohm
+/ 15 dB@12 kHz
+/ 15 dB@80 Hz
24bit
24bit
HALL, ROOM, VOCAL, PLATE, STEREO DELAY
REV+DELAY, and REV+CHORUS combinations
16
16 position PRESET selector
CLIP LED
MUTE SWITCH with LED indicator
Fader 0 dB, channels muted: 85 dBr (ref.: +4 dBu)
Fader 0 dB, all input channels assigned and set to
UNITY gain: 81 dBr(ref.: +4 dBu)
+22 dBu unbalanced, 1/4"jacks
+22dBu
70W x 2 RMS (Nominal power)
25 Hz 20 kHz
8 ohm
82W x 2(EIAJ)
USA/Canada
100 120V~, 60 Hz
Europe
210 240V~, 50 Hz
U.K./Australia
240V~, 50Hz
260 watts
100 120V~: T4A
21 0 240V~: T2A
216.5x143.5x152.5mm(LxWxH)(8.5"x5.6"x6")
9.5 Kg
11.34 Kg
14
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 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 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.
15
SEIKAKU TECHNICAL GROUP LIMITED
NO. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan
http://www.altoproaudio.com Tel: 886-4-22313737
email: alto@altoproaudio.com Fax: 886-4-22346757
All rights reserved to ALTO. All features and content might be changed
without prior notice. Any photocopy, translation, or reproduction of part of this
manual without written permission is forbidden. Copyright c 2007 Seikaku Group
NF02055-1.2
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