LTO

R

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

WARNING

To reduce the risk of electric shock and fire, do not expose this equipment to moisture or rain.

7.

8.

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.

11.

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.

12.

CAUTION

Describes precautions that should be observed to prevent damage to the product.

1.

Read this Manual carefully before operation.

2.

3.

4.

Keep this Manual in a safe place.

Be aware of all warnings reported with this symbol.

Keep this Equipment away from water and moisture.

5.

Clean it only with dry cloth. Do not use solvent or other chemicals.

6.

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.

9.

Refer all service to qualified service personnel only. Do not perform any servicing other than those instructions contained within the

User's Manual.

HOURS X DAY

8

6

4

3

Dispose of this product should not be placed in municipal waste and should be separate collection.

Move this Equipment only with a cart, 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:

The apparatus shall be connected to a mains socket outlet with a protective earthing connection.

SPL

90

92

95

97

2

1,5

1

0,5

0,25 or less

100

102

105

110

115

EXAMPLE

Small gig train

Subway train

High level desktop monitors

Classic music concert

Rock concert

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.

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. INTRODUCTION.........................................................................1

2. FEATURES................................................................................1

3. CONTROL ELEMENTS................................................................2

4. APPLICATION............................................................................7

5. INSTALLATION & CONNECTION...................................................9

6. TECHNICAL SPECIFICATIONS .....................................................12

7. 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 2

EQU231-MKII V2 -Graphic Stereo 31-Band Equalizer

EQU231TWIN-MKII V2 -Graphic Stereo 31-Band Equalizer

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

SPO

TLIGHT

3. CONTROL ELEMENTS

Front panel

EQU131-MKII V2

2 12 5

8

7

6

10

LTO

R

20 25 31.5

40 50 63

31 Band Graphic Equalizer

+12

INPUT

LEVEL

+6 +12

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

0 0dB

8K 10K 12.5K

16K 20K

-12 - 6 -12

INPUT

SIG CLIP

6 12 40Hz

OUTPUT

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

EQU131

MK V2

1 11 3 4 9

EQU215-MKII V2

8

7 4

R

LTO

25

Dual 15 Band Graphic Equalizer

40

63 100

160

250 400

630

1K 1.6K

2.5K

4K 6.3K

10K

Channel One

+12 +6 +12

INPUT OUTPUT

SIG CLIP SIG CLIP

40Hz 16KHz

0 0dB

HI-PASS LOW-PASS

6 12

ON

16K

-12 -12

LEVEL RANGE EQ

25

40

63 100

160

250 400

630

1K 1.6K

2.5K

4K 6.3K

10K

Channel Two

+12 +6 +12

0 0dB

16K

-12 - 6 -12

LEVEL

INPUT OUTPUT

SIG CLIP SIG CLIP

40Hz 16KHz

HI-PASS LOW-PASS

6 12

ON

EQU215

MK V2

RANGE EQ

1

5

6

1

2

3

12

11

9

10

EQU215TWIN-MKII

LTO

R

Dual 15 Band Graphic Equalizer

3

8

7

4

Channel One

+12 +6 +12

INPUT OUTPUT

SIG CLIP SIG CLIP

5

6

Channel Two

+12 +6 +12 INPUT OUTPUT

SIG CLIP SIG CLIP

0 0dB

40Hz 16KHz

EQU215TWIN

MK

HI-PASS LOW-PASS

0 0dB

40Hz 16KHz

HI-PASS LOW-PASS

25 40 63 100 160 250 400 630 1K 1.6K

2.5K

4K 6.3K

10K

6 12

16K

-12 - 6 -12

INPUT

LEVEL

RANGE

ON

EQ

1 2 11

12

9

10

25 40 63 100 160 250 400 630 1K 1.6K

2.5K

4K 6.3K

6 12

10K 16K

-12 - 6 -12

INPUT

LEVEL

RANGE EQ

ON

1

2

EQU131VU-MKII

5

8 13 7 6

OUTPUT

31 Band Graphic Equalizer

+12 +6 +12

LTO

R

0 0dB

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

-12 - 6 -12

INPUT

LEVEL

R

LTO

POWER OUTPUT

INPUT

SIG CLIP

OUTPUT

SIG CLIP

6 12 40Hz 16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

EQU131VU

MK

1 2

12

11

3

4

9

10

2

SPO

TLIGHT

3. CONTROL ELEMENTS

EQU231VU-MKII V2

20 25 31.5

40 50 63

LTO

R

20 25 31.5

40 50 63

7

1

3

2

5

8

6

4

80 100 125 160 200 250 315 400

80 100 125 160 200 250

Dual 31 Band Graphic Equalizer

315 400

500 630 800 1K 1.25K

1.6K

2K 2.5K

3.15K

4K

500 630 800 1K 1.25K

1.6K

2K 2.5K

3.15K

4K

5K 6.3K

5K 6.3K

8K

8K

10K 12.5K

16K 20K

+12

INPUT

LEVEL

+6 +12

INPUT OUTPUT

SIG CLIP SIG CLIP

40Hz 16KHz

Channel One

Channel Two

-12 - 6

0dB

-12

HI-PASS LOW-PASS

6 12 ON

+12 +6 +12

RANGE EQ

INPUT OUTPUT

SIG CLIP SIG CLIP

40Hz 16KHz

0dB

HI-PASS LOW-PASS

6 12 ON

10K 12.5K

16K 20K

-12 - 6 -12

INPUT

LEVEL

RANGE EQ

OUTPUT

20

10

6 3 0

3

5

50 100

VU

LTO

R

POWER OUTPUT

OUTPUT

20

10

6 3

50 100

VU

0

3

5

EQU231VU

MK V2

LTO

R

POWER OUTPUT

11 9 13

12

10

EQU231-MKII V2

12

8

5

7

6

20

20

25

25

31.5

31.5

40

40

50

50

63

63

80

80

100

100

125

125

160

160

200

200

250

250

315

315

400

400

500

500

630

630

800

800

1K

1K 1.25K

1.6K

1.25K

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

20K

20K

+12

INPUT

LEVEL

+6 +12

0 0dB

LTO

R

Dual 31 Band Graphic Equalizer

-12 - 6 -12

Channel One

Channel Two

+12 +6 +12

0 0dB

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

-12 - 6 -12

INPUT

LEVEL

INPUT OUTPUT

SIG CLIP

6 12 40Hz

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

INPUT OUTPUT

SIG CLIP

6 12 40Hz

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

1

2

11

3

4

9

10

EQU231

MK V2

EQU231TWIN-MKII V2

5

3

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

+12

INPUT

LEVEL

+6 +12

0 0dB

SIG

INPUT

CLIP

6 12 40Hz

6

OUTPUT

SIG CLIP

16KHz ON

4

LTO

R

Dual 31 Band Graphic Equalizer

RANGE HI-PASS

-12 - 6

Channel One

Channel Two

+12 +6

-12

+12

0

SIG

INPUT

CLIP

0dB

6 12 40Hz

LOW-PASS EQ

OUTPUT

EQU231TWIN

MK V2

SIG CLIP

16KHz ON

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

-12 - 6 -12

INPUT

LEVEL

RANGE HI-PASS LOW-PASS EQ

2

11 7 8 9 10

1

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

SPO

TLIGHT

3. CONTROL ELEMENTS

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

SPO

TLIGHT

3. CONTROL ELEMENTS

The rear panel

EQU131-MKII V2

19

ON

POWER

OFF

14

MODEL

SERIAL

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

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

18

LIFT

GND

UNBALANCED

OUTPUT

BALANCED

17

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

16 15

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

UNBALANCED

INPUT

BALANCED

PUSH

NEW TIDE

3

2 1

17 16 15

EQU215-MKII V2

19

AC INPUT

95-120V /210-240V 60-50Hz

Rated Power Consumption 9W

ON

FUSE:

210-240V: T100mAL 250VAC

95-120V: T160mAL 250VAC

REPLACE FUSE WITH CORRECT

TYPE ONLY

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

OFF

POWER

LIFT

GND

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

UNBALANCED

OUTPUT

BALANCED

CHANNEL 2

UNBALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

INPUT

BALANCED

14 18 17 16 15 17 16 15

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

CHANNEL 1

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

UNBALANCED

OUTPUT

BALANCED UNBALANCED

INPUT

BALANCED

EQU215TWIN-MKII

19

ON

POWER

OFF

MODEL

SERIAL

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

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

UNBALANCED

OUTPUT

BALANCED

CHANNEL 2

UNBALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

INPUT

BALANCED

LIFT

GND

14 18 17 16 15 17 16 15

EQU131VU-MKII

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

CHANNEL 1

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

UNBALANCED

OUTPUT

BALANCED UNBALANCED

INPUT

BALANCED

ON

POWER

OFF

MODEL

SERIAL

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

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

LIFT

GND

UNBALANCED

OUTPUT

BALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

UNBALANCED

INPUT

BALANCED

19 14

EQU231VU-MKII V2/EQU231-MKII V2

ON

POWER

OFF

MODEL

AC INPUT

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

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

SERIAL

18

19

14

17 16

15

17 16

15

18

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

CHANNEL 1

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

UNBALANCED

OUTPUT

BALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

UNBALANCED

CHANNEL 2

INPUT

BALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

LIFT

GND

UNBALANCED

OUTPUT

BALANCED UNBALANCED

INPUT

BALANCED

17

16

15

17

16 15

5

SPO

TLIGHT

3. CONTROL ELEMENTS

EQU231TWIN-MKII V2

ON

POWER

OFF

MODEL

AC INPUT

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

Apparaten skall anslutas till jordat uttag nar den ansluts till ett natverk

SERIAL

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

CHANNEL 1

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

UNBALANCED

OUTPUT

BALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

UNBALANCED

CHANNEL 2

INPUT

BALANCED

TIP/PIN 2

RING/PIN 3

SLEEVE/PIN 1

PUSH

LIFT

GND

UNBALANCED

OUTPUT

BALANCED UNBALANCED

INPUT

BALANCED

19 14 18 17 16 15 17 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

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

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

CH2 IN

From line instrument outputs

CH1 OUT

CH2 OUT

To power amplifier inputs

20 25 31.5

40 50

R

LTO

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

+12

INPUT

LEVEL

+6 +12

0 0dB

-12 - 6 -12

Dual 31 Band Graphic Equalizer

Channel One

Channel Two

63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K

1.6K

2K 2.5K

3.15K

4K

+12 +6 +12

5K 6.3K

8K 10K 12.5K

16K

0 0dB

20K

-12 - 6 -12

INPUT

LEVEL

INPUT

SIG CLIP

6 12 40Hz

OUTPUT

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

INPUT

SIG CLIP

6 12 40Hz

OUTPUT

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

EQU231

MK V2

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

Send 2

Send 1

CH2 OUT

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

LTO

R

Dual 31 Band Graphic Equalizer

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

+12

INPUT

LEVEL

+6 +12

0

-12 - 6

0dB

-12

Channel One

Channel Two

+12 +6 +12

5K 6.3K

8K 10K 12.5K

16K

0 0dB

20K

-12 - 6 -12

INPUT

LEVEL

INPUT OUTPUT

SIG CLIP

6 12 40Hz

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

INPUT OUTPUT

SIG CLIP

6 12 40Hz

SIG CLIP

16KHz ON

RANGE HI

PASS

LOW

PASS

EQ

EQU231

MK V2

NOTE: Mono/Stereo Application a . For mono application, please use the

EQU131VU-MKII

EQU131-MKII V2 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

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.

Ring=Right Signal

Sleeve

Tip

Ring

Strain Clamp

Tip=Left Signal

Sleeve=Ground/Screen

Use for Headphone

1/4" Stereo (TRS) Jack Plug

Sleeve

Tip

Strain Clamp Tip=Signal

Sleeve=Ground/Screen

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

1/4" Mono (TS) Jack Plug

9

10

5. INSTALLATION AND CONNECTION

Strain Clamp

Sleeve

Tip

Ring

Ring=Return Signal

Tip=Send Signal

Sleeve=Ground/Screen

Use for Insert Points

1/4" Stereo (TRS) Jack Plug

TIP RING SLEEVE

TIP RING SLEEVE

TIP RING SLEEVE

2=Hot(+)

2

3

1

1=Ground/Screen

3=Cold(-)

Use for Balanced Mic Inputs

(For unbalanced use, connect pin 1 to 3)

3-pin XLR Male Plug

(seen from soldering side)

2=Hot(+)

2

3

1

1=Ground/Screen

3=Cold(-)

Use for Main output

(For unbalanced use, leave pin3 unconnected)

3-pin XLR Line Socket

(seen from soldering side)

SLEEVE TIP

SLEEVE RING TIP

Tip

Ring

Sleeve

Tip

Ring

Sleeve

Tip

Ring

Sleeve

Insert Leads

Tip (Send)

Sleeve

Tip (Return)

Sleeve

1

2 (Send)

3

1

2 (Return)

3

Centre (Send)

Screen

Centre (Return)

Screen

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

Tip

Ring

Sleeve

Tip

Ring

Sleeve

1

2

3

1

2

3

1

2

3

Tip

Ring

Sleeve

TIP RING SLEEVE

Unbalanced

TIP RING SLEEVE

TIP SLEEVE

TIP SLEEVE

TIP RING SLEEVE

TIP SLEEVE

TIP RING SLEEVE

SLEEVE TIP

SLEEVE RING TIP

Tip

Ring

Sleeve

Tip

Sleeve

Tip

Sleeve

1

2

3

Tip

Ring

Sleeve

Tip

Sleeve

Tip

Ring

Sleeve

1

2

3

1

2

3

1

2

3

Centre

Screen

Tip

Sleeve

Tip

Ring

Sleeve

Centre

Screen

1

2

3

Centre

Screen

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6. TECHNICAL SPECIFICATION

Type

EQU231VU-MKII V2

EQU231-MKII V2

EQU231TWIN-MKII V2

EQU131VU-MKII

EQU131-MKII V2

EQU215-MKII V2

EQU215TWIN-MKII

Slider travel

Range

Input connections

Input impedance

Maximum input level

Output connections

Output impedance

High pass filter

Low pass filter

Frequency response

THD + N%

S/N ration

Power supply

Consumption

EQU231VU-MKII

EQU231-MKII V2

EQU231TWIN-MKII V2

EQU131VU-MKII V2

EQU131-MKII V2

EQU215-MKII V2

EQU215TWIN-MKII

Dimension

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)

20 mm with positive centre detent

(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

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

110 dB

95V-120VAC-60 Hz

220V-240VAC-50 Hz/60 Hz

2 31 Band: 1/3 octave, ISO spacing:18 W

2 31 Band: 1/3 octave, ISO spacing:18 W

2 31 Band: 1/3 octave, ISO spacing:18 W

1 31 Band: 1/3 octave, ISO spacing:9 W

1 31 Band: 1/3 octave, ISO spacing:9 W

2 15 Band: 2/3 octave, ISO spacing:9 W

2 15 Band: 2/3 octave, ISO spacing:9 W

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)

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.

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SEIKAKU TECHNICAL GROUP LIMITED

NO. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan http://www.altoproaudio.com Tel: 886-4-22313737 email: [email protected] Fax: 886-4-22346757

All rights reserved to ALTO. All features and content might be changed without prior notice. Any photocopy, translation, or reproduction of part of this manual without written permission is forbidden. Copyright c

2007 Seikaku Group

NF01783-1.2