Alto | EQU MK II Series | User`s manual | Alto EQU MK II Series User`s manual

R
LTO
User's Manual
EQU MKII SERIES
15/31 BANDS GRAPHIC EQUALIZER
www.altoproaudio.com
Version 1.2 NOV. 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
The apparatus shall be connected to a mains
only. Do not perform any servicing other than
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.
INTRODUCTION.........................................................................1
FEATURES................................................................................1
CONTROL ELEMENTS................................................................2
APPLICATION............................................................................7
INSTALLATION & CONNECTION...................................................9
TECHNICAL SPECIFICATIONS.....................................................12
WARRANTY.............................................................................13
1. INTRODUCTION
Thank you for your purchasing the EQU MKII series Graphic Equalizers.
With the EQU MKII series Graphic Equalizers you have acquired extremely
musical and flexible Graphic Equalizer. The high-end EQU MKII series are
based on many years of experience and are designed to provide a permanent
precise equalization to musician, performer, and studio engineer. They can be
used wherever is requested to modify the frequency "contour" of a sound and
can offer a solution to many common sound problems and allows the user to
use the creativity to obtain nice results in terms of sound characterization.
EQU Series Graphic Equalizers include the following seven models:
EQU131-MKII V2-Graphic Mono 31-Band Equalizer
EQU215-MKII V2-Graphic Stereo 15-Band Equalizer
EQU215TWIN-MKII-Graphic Stereo 15-Band Equalizer
EQU131VU-MKII-Graphic Mono 31-Band Equalizer/VU Meter 1
EQU231VU-MKII V2-Graphic Stereo 31-Band Equalizer/VU Meter
EQU231-MKII V2-Graphic Stereo 31-Band Equalizer
EQU231TWIN-MKII V2-Graphic Stereo 31-Band Equalizer
2
Enjoy your EQU MKII and make sure to read this Manual carefully before
operation.
2. FEATURES
Constant Q circuitry with a 3% center frequency accuracy
Control range 6 dB/ 12 dB selectable
Active balanced and unbalanced input and output connectors
Variable input level control
Signal clip pilot
Ground "LIFT" switch to disconnect signal ground from chassis ground
Power off automatic bypass function
Line voltage selectable
Robust and compact design
Mountable in a 19" rack unit(1U)
Manufactured Under QS9000, VDA6.1 certified management system
1
SP
OT
L
IG
3. CONTROL ELEMENTS
HT
Front panel
EQU131-MKII V2
8
6
2 12 5
10
7
INPUT
LEVEL
31 Band Graphic Equalizer
+12 +6
INPUT
OUTPUT
+12
SIG CLIP
R
0
LTO
6
0dB
-12 - 6
25
31.5
40
50
80
63
100
125
160
200
250
315
400
500
800
630
1.25K
1K
1.6K
2K
2.5K
3.15K
5K
4K
8K
6.3K
10K
12.5K
16K
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
EQU131
MK V2
-12
RANGE
20
SIG CLIP
12
20K
11 3
1
4
9
EQU215-MKII V2
8
7
Dual 15 Band Graphic Equalizer
INPUT
Channel One
+12 +6
OUTPUT
SIG CLIP SIG CLIP
+12
40Hz
R
+12 +6
40Hz
25
40
63
100
160
250
400
630
1K
1.6K
2.5K
4K
6.3K
10K
16K
6
-12
LEVEL
12
-12 - 6
25
EQ
5
40
63
100
160
250
400
6
1
EQU215
MK V2
HI-PASS LOW-PASS
ON
RANGE
16KHz
0dB
0
HI-PASS LOW-PASS
-12 -- 66
OUTPUT
SIG CLIP SIG CLIP
+12
16KHz
0dB
0
LTO
4
INPUT
Channel Two
1K
630
1.6K
2.5K
4K
6.3K
16K
10K
LEVEL
12
ON
EQ
RANGE
2
1
6
-12
10
12
3
11 9
EQU215TWIN-MKII
8
4
3
Dual 15 Band Graphic Equalizer
5
7
Channel One
+12 +6
+12
INPUT
+12 +6
OUTPUT
+12
SIG CLIP SIG CLIP
40Hz
R
0
LTO
0
6
63
100
160
250
400
630
1K
1.6K
2.5K
4K
6.3K
10K
16K
ON
12
6
-12 - 6
RANGE
EQ
25
40
63
100
160
250
400
12
2 11 9
1
16KHz
0dB
EQU215TWIN
HI-PASS LOW-PASS
-12
INPUT
LEVEL
OUTPUT
40Hz
16KHz
0dB
-12 - 6
40
INPUT
SIG CLIP SIG CLIP
HI-PASS LOW-PASS
25
6
Channel Two
630
1K
1.6K
2.5K
4K
6.3K
10K
1
12
ON
-12
INPUT
LEVEL
16K
MK
RANGE
EQ
2
10
EQU131VU-MKII
5
8 13
31 Band Graphic Equalizer
7
OUTPUT
+12 +6
+12
LTO
R
EQU131VU
POWER OUTPUT
R
0
LTO
0dB
INPUT
SIG
6
-12 - 6
20
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
1
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
20K
-12
12
RANGE
INPUT
LEVEL
2
SIG
CLIP
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
4
3
MK
OUTPUT
CLIP
11
12
2
6
10
9
SP
OT
L
IG
3. CONTROL ELEMENTS
HT
EQU231VU-MKII V2
7
8
3
6
5
20
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
INPUT
LEVEL
20K
4
INPUT
0dB
0
-12 - 6
OUTPUT
SIG CLIP SIG CLIP
+12
+12 +6
OUTPUT
40Hz
16KHz
20
6
-12
3
10
6
50
100
VU
HI-PASS LOW-PASS
0
3
5
ON
12
R
LTO
POWER OUTPUT
R
Channel One
Channel Two
Dual 31 Band Graphic Equalizer
LTO
0dB
-12 - 6
31.5
40
50
80
63
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2.5K
2K
3.15K
5K
4K
8K
6.3K
10K
12.5K
16K
SIG CLIP SIG CLIP
40Hz
20
6
20
25
31.5
40
40
50
50
63
63
LTO
11 9
100
100
125
125
160
160
200
200
250
250
315
315
400
400
500
500
630
630
800
800
1K
1K
1.25K
1.25K
1.6K
1.6K
2K
2K
2.5K
2.5K
3.15K
3.15K
4K
4K
5K
5K
6.3K
6.3K
8K
8K
10K
10K
12.5K
12.5K
16K
16K
13
INPUT
OUTPUT
+12
6
R
12
SIG CLIP
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
0dB
-12 - 6
-12
+12 +6
+12
RANGE
INPUT
SIG CLIP
6
-12 - 6
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
12
MK V2
OUTPUT
SIG CLIP
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
0dB
0
40
EQU231
Channel One
Channel Two
Dual 31 Band Graphic Equalizer
LTO
6
7
5
SIG CLIP
31.5
R
10
INPUT
LEVEL
20K
0
25
MK V2
20K
+12 +6
20
EQU231VU
5
8
80
80
3
POWER OUTPUT
12
31.5
100
VU
0
EQ
EQU231-MKII V2
25
50
ON
12
12
20
6
16KHz
RANGE
2
3
10
HI-PASS LOW-PASS
-12
INPUT
LEVEL
20K
1
OUTPUT
+12
0
25
EQ
INPUT
OUTPUT
+12 +6
20
RANGE
-12
RANGE
INPUT
LEVEL
20K
9
3
2
1
10
4
11
EQU231TWIN-MKII V2
5
20
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
20K
4
6
3
INPUT
LEVEL
+12 +6
+12
INPUT
SIG
0
6
R
-12 - 6
-12
+12 +6
+12
12
RANGE
16KHz
ON
HI-PASS
LOW-PASS
EQ
EQU231TWIN
MK V2
INPUT
SIG
0
0dB
6
-12 - 6
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
1
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
20K
OUTPUT
SIG
CLIP
12
RANGE
20
CLIP
40Hz
Channel One
Channel Two
Dual 31 Band Graphic Equalizer
LTO
OUTPUT
SIG
CLIP
0dB
CLIP
40Hz
16KHz
ON
HI-PASS
LOW-PASS
EQ
-12
INPUT
LEVEL
2
11 7
8
9 10
12
1 Filter level controls
Each one of these linear potentiometers will boost or attenuate (either 6dB or
12 dB) the selected frequency at a preset bandwidth. When all the sliders are
in the centre position, the output of the equalizer is flat response.
3
SP
OT
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3. CONTROL ELEMENTS
HT
2 Level control
This control sets the input signal level of the equalizer. The "0 dB" position is unity
gain (no boost or attenuation). If the clip LED (5) lights continuously, turn down
this control until it only blinks occasionally.
3 High-pass Filter
This button electronically inserts a filter into the signal path, which cuts the low
frequencies at 40 Hz (12 dB per octave). The LED (12) indicator lights up when
the button is pressed and this filter is serving in the circuit.
4 Low-pass Filter
This button electronically inserts a filter into the signal path, which cuts the high
frequencies at 16 K (12 dB per octave). The LED (13) indicator lights up when
the button is pressed and this filter is serving in the circuit.
5 High-pass LED
When the High pass filter (40 Hz/12 dB) is actived, this LED will light up.
6 Low-pass LED
When the Low pass filter (16 kHz/12 dB) is actived, this LED will light up.
7 Clip LED
This LED will light up when any section of the equalizer is within 5 dB of
clipping. Occasional blinking of this clip LED is acceptable, but if it remains on
continuously, you should turn down the level control or reduce the output level
of the preceding component to avoid audible distortion.
8 Signal LED
This green LED will light up when any signal appears at Input/Output stage.
9 EQ switch
This switch inserts or removes the equalizer to channel path. If press this switch,
the EQ LED (8) will be illuminated, which means it is in EQ mode. When release
this switch, the input signal is routed directly into the output jacks, which means
it is in bypass mode.
10 EQ LED
When this LED lights up, it is in EQ mode.
11 Range switch
This button switches the gain range of the filter slider between 6 dB and 12 dB.
12 Filter range indicator
When the 6 dB range is selected, green LED will light up. When the 12 dB range
is selected, red LED will light up.
13 VU Meter (Only for EQU131VU-MKII/231VU-MKII V2)
This VU meter is used to indicate the output level.
4
SP
OT
L
IG
3. CONTROL ELEMENTS
HT
The rear panel
EQU131-MKII V2
PUSH
AC INPUT
95-120V /210-240V 60-50Hz
Rated Power Consumption 9W
ON
MODEL
SERIAL
OFF
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
FUSE:
NEW
TIDE
3
2
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
POWER
LIFT
GND
OUTPUT
UNBALANCED
18
14
19
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
210-240V: T100mAL 250VAC
95-120V: T160mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
17
1
INPUT
BALANCED
UNBALANCED
15
16
BALANCED
15
16
17
EQU215-MKII V2
AC INPUT
FUSE:
95-120V /210-240V 60-50Hz
Rated Power Consumption 9W
ON
CHANNEL 2
210-240V: T100mAL 250VAC
95-120V: T160mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
CHANNEL 1
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
OFF
LIFT
GND
POWER
19
14
OUTPUT
UNBALANCED
18
17
INPUT
BALANCED
16
UNBALANCED
17
15
OUTPUT
BALANCED
UNBALANCED
INPUT
BALANCED
UNBALANCED
BALANCED
15
16
EQU215TWIN-MKII
AC INPUT
95-120V /210-240V 60-50Hz
Rated Power Consumption 9W
FUSE:
210-240V: T100mAL 250VAC
95-120V: T160mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
CHANNEL 2
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
ON
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
CHANNEL 1
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
MODEL
OFF
POWER
OUTPUT
SERIAL
UNBALANCED
INPUT
BALANCED
UNBALANCED
OUTPUT
BALANCED
UNBALANCED
INPUT
BALANCED
UNBALANCED
BALANCED
LIFT
GND
19
14
17
18
16
15
17
16
15
EQU131VU-MKII
AC INPUT
95-120V /210-240V 60-50Hz
Rated Power Consumption 9W
PUSH
FUSE:
ON
210-240V: T100mAL 250VAC
95-120V: T160mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
OFF
MODEL
POWER
LIFT
GND
OUTPUT
UNBALANCED
INPUT
BALANCED
UNBALANCED
BALANCED
SERIAL
19
14
15
16
17
18
17
15
16
EQU231VU-MKII V2/EQU231-MKII V2
CHANNEL 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
AC INPUT
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
95-120V /210-240V 60-50Hz
Rated Power Consumption 18W
FUSE:
210-240V: T100mAL 250VAC
95-120V: T200mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
ON
OUTPUT
UNBALANCED
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
INPUT
BALANCED
UNBALANCED
BALANCED
CHANNEL 2
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
MODEL
OFF
POWER
SERIAL
LIFT
GND
19
14
PUSH
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
18
OUTPUT
UNBALANCED
17
16
INPUT
BALANCED
15
UNBALANCED
17
BALANCED
16
15
5
SP
OT
L
IG
3. CONTROL ELEMENTS
HT
EQU231TWIN-MKII V2
CHANNEL 1
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
AC INPUT
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
PUSH
95-120V /210-240V 60-50Hz
Rated Power Consumption 18W
FUSE:
ON
210-240V: T100mAL 250VAC
95-120V: T200mAL 250VAC
REPLACE FUSE WITH CORRECT
TYPE ONLY
OUTPUT
Apparaten skall anslutas till
jordat uttag nar den ansluts
till ett natverk
UNBALANCED
INPUT
BALANCED
UNBALANCED
BALANCED
CHANNEL 2
OFF
POWER
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
MODEL
TIP/PIN 2
RING/PIN 3
SLEEVE/PIN 1
PUSH
SERIAL
LIFT
GND
OUTPUT
UNBALANCED
19
14
18
17
16
INPUT
BALANCED
15
UNBALANCED
17
BALANCED
16
15
14 Power switch
It switches the unit ON and OFF.
15 XLR IN/OUT connectors
The XLR connectors are balanced and are used to Input/Output the signal.
16 1/4" TRS phone IN/OUT connectors
The 1/4" TRS connector are balanced and are used to Input/Output the signal.
17 RCA IN/OUT connectors
The RCA connectors are unbalanced.
NOTE: While you can use any input connector with any output connector, only
one set of these connectors is to be used at one time (The wiring and
connection, details please refer to 5.2 audio connection).
18 Ground lift switch
This switch is used to disconnect the signal ground from the mains and chassis
earth. If it is determined that the equalizer is the cause of hum or buzz in your
system due to a ground loop, move this switch to "lift" position.
19 AC Inlet/Fuse holder
Standard IEC receptacle. Connect your equalizer an AC socket with the supplied
power cord. Before powering up your equalizer for the first time, make certain
the stated power requirement of the unit matches the voltage supplied by the
AC socket.
If the fuse blows, replaced with a fuse of the correct type only.
6
4. APPLICATION
4.1 The Sound Frequency
In recording studios as well as stage or radio plays, the equalizer will give you
a perfect contour of your sound. But first of all, you should clarify the typical
frequency of each instrument and voice, so that you can obtain nice results in
terms of sound characterization. The following table will give you an idea of
specific frequencies and their acoustic significance.
Typical Frequency of Each Instrument and Voice
Mid C
CDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABCDEFGABC
25
31
40
50
62
80
100 125
160 200 250 320 400 500 640 800
1K
1.3K 1.6K
2K
2.5K 3.1K
4K
5K
6.2K
8K
10K
13K
16K
20K
Human hearing range
Vocal
Soprano
Contralto
Baritone
Bass
WOODWIND
Piccolo
Flute
Oboe
Clarinet in B flat or A
Clarinet in E flat
Bass Clarinet
Basset Horn
Cor Anglais
Bassoon
Double Bassoon
Brass
Soprano Saxophone
Alto Saxophone
Tenor Saxophone
Baritone Saxophone
Bass Saxophone
Trumpet in C
Trumpet in F
Alto Trombone
Tenor Trombone
Bass Trombone
Tuba
Valve Horn
STRINGS
Violin
Viola
Cello
Double Bass
Guitar
KEYBOARDS
Pianoforte
Organ
PERCUSSION
Celesta
Timpani
Xylophone
25
31
40
50
62
80
100
125
160
200
250
320
400
500
640
800
1K
1.3K
1.6K
2K
2.5K
3.1K
4K
5K
6.2K
8K
10K
13K
16K
20K
FREQUENCY
7
4. APPLICATION
4.2 Application on line instrument
The EQU MKII Series Graphic Equalizer can be used on an entire mix "In-line"
between a instrument outputs and a power amplifier, and this is the basic
application in the PA system to offer precise equalization control.
CH1 IN
CH1 OUT
CH2 OUT
CH2 IN
From line instrument outputs
20
25
31.5
40
50
63
80
100
125
160
200
250
315
To power amplifier inputs
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
INPUT
LEVEL
20K
+12 +6
INPUT
OUTPUT
+12
SIG CLIP
6
R
40Hz
-12 - 6
-12
+12 +6
+12
RANGE
16KHz
ON
HI
PASS
LOW
PASS
EQ
INPUT
6
-12 - 6
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
20K
SIG CLIP
12
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
0dB
0
25
MK V2
OUTPUT
SIG CLIP
20
EQU231
Channel One
Channel Two
Dual 31 Band Graphic Equalizer
LTO
SIG CLIP
12
0dB
0
-12
RANGE
INPUT
LEVEL
4.3 Mixing Console
The EQU MKII Series Graphic Equalizer can also be used on a single
instrument by connecting to a mixing console's main inserts, especially for
those consoles without built-in equalization circuitry.
Main Inserts 2
Main Inserts 1
CH2 OUT
Send 2
Send 1
CH1 OUT
CH2 IN
CH1 IN
20
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
INPUT
LEVEL
20K
+12 +6
INPUT
OUTPUT
+12
SIG CLIP
6
R
-12
RANGE
SIG CLIP
40Hz
HI
PASS
INPUT
+12 +6
6
-12 - 6
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1K
1.25K
1.6K
2K
2.5K
3.15K
4K
5K
6.3K
8K
10K
12.5K
16K
20K
12
-12
INPUT
LEVEL
RANGE
SIG CLIP
40Hz
16KHz
ON
HI
PASS
LOW
PASS
EQ
NOTE: Mono/Stereo Application
a. For mono application, please use the EQU131-MKII V2,
EQU131VU-MKII mono Graphic Equalizer.
b. For stereo application, please use the EQU215-MKII V2,
EQU215TWIN-MKII, EQU231-MKII V2, EQU231VU-MKII
or EQU231TWIN-MKII V2 stereo Graphic Equalizer, either
of the two channels can be used as L/R input & output.
8
EQU231
MK V2
+12
SIG CLIP
25
ON
EQ
OUTPUT
0dB
0
20
16KHz
LOW
PASS
Channel One
Channel Two
Dual 31 Band Graphic Equalizer
LTO
12
0dB
0
-12 - 6
5. INSTALLATION AND CONNECTION
Ok, you have got to this point and you are now in the position to operate your
equalizer successfully. However, we advise you to read carefully the following
section to be real master of your own equalizer. 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:
5.1 Mains Connection
Please ensure that the equalizer is set to the correct supply voltage before
plugging the power cord into the wall outlet, use the same fuse as marked
on the fuse holder at the AC power connection socket. The mains connections
of the EQU MKII Series Graphic Equalizer is made by using the enclosed
mains cord and a standard IEC receptacle. It meets all of the international
safety certification requirements.
5.2 Audio Connection
The equalizer presents with balanced XLR and 1/4" TRS and unbalanced RCA
connectors. It can be interfaced in several ways to support a variety of
applications without any signal loss. The equalizer can be used on a single
instrument by connecting to the mixing console's main inserts, or on an entire
mix "in-line" between a mixing console's outputs and a power amplifier. The
defective wiring may degrade the performance of equalizer, so please use good
quality screened audio cables only. Please follow the guide below to interface
equalizer without experiencing any noise or signal loss.
Sleeve
Tip
Ring
Ring=Right Signal
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
9
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
1
3
2=Hot(+)
1=Ground/Screen
2
1
3
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)
SLEEVE TIP
TIP RING SLEEVE
Tip
Ring
Sleeve
Tip (Send)
Sleeve
Tip (Return)
Sleeve
SLEEVE RING TIP
1
2 (Send)
1
3
2
Tip
Ring
Sleeve
2
1
3
Tip
Ring
Sleeve
Centre (Send)
Screen
Centre (Return)
Screen
TIP RING SLEEVE
Insert Leads
10
1
2 (Return)
3
TIP RING SLEEVE
3
5. INSTALLATION AND CONNECTION
5.3 Line Connection
For these applications the EQU MKII Series Graphic Equalizers provide 1/4"
TRS connector, XLR connectors and RCA connectors to easily interface with
most any professional audio device. Follow the configuration examples below
for your particular connection.
Banlanced
TIP RING SLEEVE
SLEEVE RING TIP
3
2
2
3
1
1
1
3
2
TIP RING SLEEVE
Tip
Ring
Sleeve
Tip
Ring
Sleeve
1
2
3
1
2
3
Tip
Ring
Sleeve
1
2
3
Tip
Ring
1
2
3
Unbalanced
1
3
2
Sleeve
TIP RING SLEEVE
Tip
1
3
2
Sleeve
1
2
3
TIP SLEEVE
2
3
1
1
2
3
Tip
TIP SLEEVE
TIP RING SLEEVE
SLEEVE TIP
SLEEVE RING TIP
Centre
Screen
Tip
Sleeve
Sleeve
Tip
Ring
Sleeve
Tip
Ring
Sleeve
Tip
Centre
Sleeve
Screen
TIP SLEEVE
Tip
Centre
Ring
Sleeve
Screen
TIP RING SLEEVE
2
2
3
3
1
1
1
2
3
1
2
3
11
6. TECHNICAL SPECIFICATION
Type
EQU231VU-MKII V2
EQU231-MKII V2
EQU231TWIN-MKII V2
EQU131VU-MKII
EQU131-MKII V2
EQU215-MKII V2
EQU215TWIN-MKII
2 31-Band: 1/3 octave, ISO spacing(2H series)
2 31-Band: 1/3 octave, ISO spacing(2H series)
2 31-Band: 1/3 octave, ISO spacing(3H series)
1 31-Band: 1/3 octave, ISO spacing(2H series)
1 31-Band: 1/3 octave, ISO spacing(1H series)
2 15-Band: 2/3 octave, ISO spacing(1H series)
2 15-Band: 2/3 octave, ISO spacing(2H series)
Slider travel
20 mm with positive centre detent
Range
Input connections
(EQU231-MKII V2/EQU231VU-MKII V2/EQU131-MKII V2/EQU215-MKII V2)
45 mm with positive centre detent(Only for EQU231TWIN-MKII V2)
60 mm with positive centre detent(EQU131VU-MKII /EQU215TWIN-MKII)
6 dB or 12 dB selectable
Active balanced XLR and 1/4" TRS
Unbalanced RCA
Input impedance
Maximum input level
Output connections
Output impedance
High pass filter
Low pass filter
Frequency response
THD + N%
S/N ration
Power supply
20 k (bal.)
15 k (unbal.)
14 dBu
Active balanced XLR and 1/4" TRS
Unbalanced RCA
<600
40 Hz(12 dB/oct) fixed-button type
16 kHz(12 dB/oct) fixed-button type
20 Hz to 50kHz at -1.5 dBu
<0.01%(@1kHz, all VR at middle position)
110 dB
95V-120VAC-60 Hz
220V-240VAC-50 Hz/60 Hz
Consumption
EQU231VU-MKII
EQU231-MKII V2
EQU231TWIN-MKII V2
EQU131VU-MKII V2
EQU131-MKII V2
EQU215-MKII V2
EQU215TWIN-MKII
2
2
2
1
1
2
2
31
31
31
31
31
15
15
Band:
Band:
Band:
Band:
Band:
Band:
Band:
1/3
1/3
1/3
1/3
1/3
2/3
2/3
octave,
octave,
octave,
octave,
octave,
octave,
octave,
ISO
ISO
ISO
ISO
ISO
ISO
ISO
spacing:18 W
spacing:18 W
spacing:18 W
spacing:9 W
spacing:9 W
spacing:9 W
spacing:9 W
Dimension
483(W) 220(D) 44(H)(19" 8.66" 1.7")mm (1H series)
483(W) 220(D) 88(H)(19" 8.66" 3.5")mm (2H series)
483(W) 220(D) 132(H)(19" 8.66" 5.1")mm (3H series)
12
7. 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.
13
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
NF01783-1.2
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