Nilfisk ALTO Stereo Equalizer EQU User Manual

User's Manual  
15/31 Band Graphic Equalizer  
EQU Series  
+18  
0dB  
-
+18  
0dB  
-
R
Version 1.0 April 2002  
English  
 
Preface  
Dear Customer:  
Thanks for choosing LTO Graphic Equalizer and thanks for choosing one of the results of LTO AUDIO  
TEAM job and researches.  
For our LTO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say...our  
obsession!  
We have been designing professional audio products for a long time in cooperation with some of the major  
brands in the world in the audio field.  
The LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our  
R&D Centres in Italy, Netherlands, United Kingdom and Taiwan. The core of our digital audio products is a  
sophisticated DSP (Digital sound processor) and a large range of state of the art algorithms which have been  
developed by our Software Team for the last 7 years.  
Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming  
the quality of our job, we would like to share with you our work and our dreams, pay attention to your suggestions  
and your comments.  
Following this idea we create our products and we will create the new ones! From our side, we guarantee you  
and we will guarantee you also in future the best quality, and the best fruits of our continuous researches  
and the best prices.  
Our LTO Graphic Equalizer is the result of many hours of listening and tests involving common people, area  
experts, musicians and technicians.  
The results of this effort is a high-end Graphic Equalizer which will provide a permanent precise equalization to  
the musician, performer, studio engineer and sound contractor .  
Nothing else to add, but that we would like to thank all the people that made the LTO Graphic Equalizer a  
reality available to our customers, thank our designers and all LTO staff, there to make possible the realization  
of products containing our idea of music and sound and there to support you, our customers, in the best way,  
conscious that you are our best richness.  
Thank you very much.  
LTO AUDIO TEAM  
2
 
TABLE OF CONTENT  
1. INTRODUCTION ..........................................................................................................................4  
2. FEATURE LIST ............................................................................................................................4  
3. CONTROL ELEMENTS.................................................................................................................4  
3.1 The Front Panel  
3.2 The Rear Panel  
4. INSTALLATION & CONNECTION ..................................................................................................8  
4.1 Mains Connection  
4.2 Audio Connection  
- Wiring Configuration  
- In Line Connection  
- Insert Points Connection  
4.3 Rack Mounting  
5. APPLICATION..............................................................................................................................10  
5.1 The Sound Frequency  
5.2 Equalizer In Sound Reinforcement Systems  
-Line Instrument  
-Mixing Console  
6. TECHNICAL SPECIFICATIONS ....................................................................................................12  
7. WARRANTY ................................................................................................................................13  
3
 
1. INTRODUCTION  
Thank you very much for expressing your confidence in LTO products by purchasing our EQU Series Graphic  
Equalizers. With the EQU Series you have acquired an extremely musical and flexible Graphic Equalizer.  
The high-end EQU Series are based on many years of experience and are designed to provide a permanent precise  
equalization to the musician, performer, studio engineer and sound contractor. The EQU Series 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 - Graphic Mono 31 Band Equalizer  
EQU215 - Graphic Stereo 15 Band Equalizer  
EQU2215 - Graphic Stereo 15 Band Equalizer  
EQU131VU - Graphic Mono 31 Band Equalizer / VU Meter*1  
EQU231VU- Graphic Stereo 31 Band Equalizer / VU Meter*2  
EQU231LED - Graphic Stereo 31 Band Equalizer / LED Display*2  
EQU231TWIN - Graphic Stereo 31Band Equalizer /LED Display*2  
2. FEATURE LIST  
Easy to Operate Front Panel Controls  
Constant Q circuitry with a 3% center frequency accuracy  
Control range 6dB / 12dB 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  
Intended for installation in standard 19" rack space  
Manufactured Under ISO9001 Certified management system  
3. CONTROL ELEMENTS  
3.1 The Front Panel  
EQU131 Front Panel  
31 Band Graphic Equalizer  
+12 +6  
0
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
R
ON  
EQU131  
OFF  
-12 -6  
40Hz  
16 KHz  
CLIP  
6
12  
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  
LEVEL  
POWER  
1
2
3
4
5 76 9 8 10  
4 1213  
EQU215 Front Panel  
3
4 1213  
3
Dual 15 Band Graphic Equalizer  
Channel One  
HI-PASS LOW-PASS  
Channel Two  
HI-PASS LOW-PASS  
40Hz  
16KHz  
12  
40Hz  
16KHz  
12  
+12 +6  
0
+18  
0dB  
-
+12 +6  
0
+18  
0dB  
-
R
40Hz  
16KHz  
40Hz  
16KHz  
ON  
EQU215  
6
6
OFF  
-12 -6  
-12 -6  
BY-PASS  
CLIP  
BY-PASS  
CLIP  
BYPASS RANGE  
BYPASS RANGE  
25  
40  
63  
100  
160  
250 400  
630  
1K  
1.6K 2.5K 4K  
6.3K 10K 16K  
LEVEL  
25  
40  
63  
100 160  
250  
400  
630  
1K 1.6K 2.5K  
4K 6.3K 10K 16K  
LEVEL  
POWER  
1
1
2
6
8
57  
2
6
8
57 10  
EQU2215 Front Panel  
13  
13  
12  
12  
Dual 15 Band Graphic Equalizer  
Channel One  
Channel Two  
+12 +6  
+18  
+14  
+10  
0dB  
+12 +6  
+18  
+14  
+10  
0dB  
3
R
0
0
HI-PASS LOW-PASS  
HI-PASS LOW-PASS  
EQU2215  
-
8
-
8
40Hz  
16KHz  
12  
40Hz  
16KHz  
12  
-12  
-12  
-
40Hz  
16KHz  
40Hz  
16KHz  
ON  
6
6
OFF  
-
0
-12 -6  
-12 -6  
BY-PASS  
CLIP  
BY-PASS  
CLIP  
BYPASS RANGE  
BYPASS RANGE  
25  
40  
63  
100  
160  
250 400  
630  
1K  
1.6K 2.5K 4K  
6.3K 10K 16K  
LEVEL  
25  
40  
63  
100 160  
250  
400  
630  
1K 1.6K 2.5K  
4K 6.3K 10K 16K  
LEVEL  
POWER  
1
7
1
2
6
8
5
4
7
2
6
8
5
10  
 
EQU131VU Front Panel  
11  
31 Band Graphic Equalizer  
+12 +6  
+17  
+13  
+ 9  
0dB  
- 9  
R
LTO  
POWER OUTPUT  
R
0
EQU131VU  
HI-PASS LOW-PASS  
BY-PASS RANGE  
-13  
-
ON  
-12 -6  
OFF  
40Hz  
16 KHz  
CLIP  
6
12  
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  
LEVEL  
POWER  
2
3 12413 57  
3
9 8 10  
4 1213  
1
EQU231VU Front Panel  
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  
LEVEL  
HI-PASS LOW-PASS  
40Hz  
16KHz  
12  
+12 +6  
+17  
0dB  
-
40Hz  
16KHz  
0
R
6
LTO  
POWER OUTPUT  
-12 -6  
BY-PASS  
CLIP  
BYPASS RANGE  
HI-PASS LOW-PASS  
R
Channel One  
Channel Two  
31 Band Graphic Equalizer  
EQU231VU  
40Hz  
16KHz  
12  
+12 +6  
0
+17  
0dB  
-
40Hz  
16KHz  
R
ON  
LTO  
POWER OUTPUT  
6
OFF  
-12 -6  
BY-PASS  
CLIP  
BYPASS RANGE  
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  
LEVEL  
POWER  
1
6
8
57 10  
2
11  
EQU231LED Front Panel  
14  
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  
LEVEL  
+12 +6  
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
0
-12 -6  
R
Channel One  
Channel Two  
40Hz  
16 KHz  
CLIP  
6
12  
Dual 31 Band Graphic Equalizer  
EQU231LED  
+12 +6  
0
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
ON  
OFF  
-12 -6  
40Hz  
16 KHz  
CLIP  
6
12  
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  
LEVEL  
POWER  
1
2
3 12413 57  
14  
9 8 10  
EQU231TWIN Front Panel  
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  
LEVEL  
+12 +6  
+17  
+13  
+ 9  
0dB  
- 9  
0
HI-PASS LOW-PASS  
BY-PASS RANGE  
-13  
-
-12 -6  
40Hz  
16 KHz  
CLIP  
6
12  
R
Channel One  
Channel Two  
Dual 31 Band Graphic Equalizer  
EQU231TWIN  
+12 +6  
+17  
+13  
+ 9  
0dB  
- 9  
0
HI-PASS LOW-PASS  
BY-PASS RANGE  
-13  
-
ON  
OFF  
40Hz  
16 KHz  
CLIP  
6
12  
-12 -6  
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  
LEVEL  
POWER  
1
2
3 12413 57  
9 8 10  
1. Filter level controls  
Each one of these linear potentiometers will boost or attenuate (either 6dB or 12dB) the selected  
frequency at a preset bandwidth.  
When all the sliders are in the centre position, the output of the equalizer is flat response.  
5
 
2. Level control  
This control sets the input signal level to the equalizer. Its "0dB" position is unity gain (no boost or attenuation).  
If the clip LED(5) is light continuously, turndown this control until it only flickers occasionally.  
3. High pass filter  
This button electronically inserts a filter into the signal path, which cuts the low frequencies at 40Hz (12dB  
per octave). The LED (12) indicator lights 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 16KHz (12dB  
per octave). The LED (13) indicator lights when the button is pressed and this filter is serving in the circuit.  
5. Clip LED  
This LED will light when any section of the equalizer is within 5 dB of clipping. Occasional flickering 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.  
6. Bypass switch  
This switch inserts or removes the equalizer channel path. If bypass, the bypass LED(7) will be  
illuminated to indicate it is in bypass mode. When bypassed, the input signal is routed directly to the  
output jacks. When power loss, the unit automatic bypassed.  
7. Bypass LED  
When this LED lights, it is in bypass mode.  
8. Range switch  
This button switches the gain range of the filter potentiometer between 6dB and 12dB.  
9. Filter range indicator  
When the 6dB range is selected, green LED will light. When the 12dB range is selected, red LED will  
light.  
10. Power switch  
This is used to switch the equalizer on and off. The appliance would be turned on when the power switch  
to be set to the on-position, and it would be turned off when the switch be set to the off-position.  
11. VU meter  
This VU meter is used to indicate the output level.  
12. High pass LED  
When the High pass filter(40Hz/12dB) is in active, this LED will light.  
13. Low pass LED  
When the Low pass filter(16KHz/12dB) is in active, this LED will light.  
14. Output level meter  
This output level meter is used to indicate the output level.  
3.2 The Rear Panel  
EQU131 Rear Panel  
19  
PUSH  
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
OUT  
IN  
OUT  
IN  
Rheinland  
Production inspected  
MODEL  
SERIAL  
NEW TIDE  
3
2
1
LIFT  
GND  
C
US  
OUT  
IN  
UNBALANCED  
BALANCED  
20  
18  
17  
16  
15  
EQU215 Rear Panel  
19  
PUSH  
PUSH  
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
Channel Two  
IN  
OUT  
Channel One  
IN  
OUT  
OUT  
OUT  
NEW TIDE  
3
NEW TIDE  
3
C
US  
2
1
2
1
Rheinland  
Production inspected  
LIFT  
GND  
OUT  
IN  
OUT  
IN  
UNBALANCED  
BALANCED  
UNBALANCED  
BALANCED  
20  
18  
17  
16  
15  
17  
16  
15  
6
 
EQU2215 Rear Panel  
19  
i
n
l
R
a
V
n
d
U
T
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
o
f
c
N
n
I
o
,
a
Rheinland  
r
US  
Production inspected  
C
t
h
c
i
A
r
e
PUSH  
PUSH  
MODEL  
SERIAL  
Channel Two  
IN  
OUT  
Channel One  
IN  
OUT  
OUT  
IN  
OUT  
IN  
NEW TIDE  
3
NEW TIDE  
3
2
1
2
1
LIFT  
GND  
OUT  
IN  
OUT  
IN  
UNBALANCED  
BALANCED  
UNBALANCED  
BALANCED  
20  
18  
17  
16  
15  
17  
16  
15  
EQU131VU Rear Panel  
19  
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
PUSH  
Rheinland  
Production inspected  
OUT  
IN  
OUT  
IN  
MODEL  
SERIAL  
NEW TIDE  
3
2
1
C
US  
LIFT  
GND  
OUT  
IN  
UNBALANCED  
BALANCED  
20  
18  
17  
16  
15  
EQU231VU/EQU231LED Rear Panel  
19  
PUSH  
Channel One  
IN  
OUT  
OUT  
IN  
NEW TIDE  
3
2
1
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
OUT  
BALANCED  
IN  
UNBALANCED  
Channel Two  
IN  
OUT  
PUSH  
Rheinland  
Production inspected  
MODEL  
SERIAL  
OUT  
IN  
NEW TIDE  
3
2
1
LIFT  
GND  
C
US  
OUT  
BALANCED  
IN  
UNBALANCED  
17  
16  
15  
20  
18  
EQU231TWIN Rear Panel  
19  
PUSH  
Channel One  
IN  
OUT  
OUT  
IN  
NEW TIDE  
3
2
1
RISK OF FIRE-REPLACE  
FUSE AS MARKED  
OUT  
IN  
UNBALANCED  
Channel Two  
IN  
OUT  
BALANCED  
PUSH  
MODEL  
SERIAL  
OUT  
IN  
NEW TIDE  
3
2
1
LIFT  
GND  
OUT  
IN  
UNBALANCED  
BALANCED  
20  
18  
17  
16  
15  
15. XLR input and output connector  
The XLR connector are actively balanced and are used to input/output the signal.  
16. 1/4" TRS phone plug input and output connector  
The 1/4" TRS connector are actively balanced and are used to input/output the signal.  
17. RCA input and output connector  
The RCA connector are unbalanced.  
7
 
NOTE : While you can use any input connector with any output connector, only one set of these con-  
nectors is to be used at one time, detail wiring and connection, please refer to 4.2 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 the  
"lift" position.  
19. Fuse holder / Voltage selector  
This is a dual voltage unit. Before you attempt to connect and operate the unit, please make sure that your  
local voltage matches the voltage on the fuse-holder cover.  
Caution: The fuse protecting the AC supplies circuits of this unit. The fuse can only be changed by  
a qualified technician, in the event of a fault or changing the supply voltage. If the fuse continues to  
blow after replacing, discontinue use of this unit before repaired.  
1 1 0 - 1 2 0 V  
2 2 0 - 2 4 0 V  
220-240V  
110-120V  
THIS IS SET FOR  
110V AC TO 120V  
AC OPERATION  
THIS IS SET FOR  
220V AC TO 240V  
AC OPERATION  
The fuse-holder above the AC connector on the rear of the chassis has 3 triangular markers(please  
refer to the above pictures), with two of these triangles opposing each other, your unit is set to the  
operating voltage printed next to these markers.  
To change, pull fuse-holder out and rotate 180 ,then push in again.  
20. AC Inlet  
This connector is meant for the connection of the supplied main cord.  
Do not insert power cable into unit until voltage has been correctly set. Do not plug power cable into AC  
power until voltage has been correctly set.  
4. INSTALLATION & CONNECTION  
4.1 Mains Connection  
Please ensure that the EQU Series Graphic 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 connection of the EQU Series Graphic Equalizer is made by using the enclosed mains cable and  
a standard IEC receptacle. It meets all of the international safety certification requirements.  
4.2 Audio Connection  
The EQU Series Graphic Equalizer presents with balanced XLR & 1/4" TRS and unbalanced RCA connectors,  
and it can be interfaced by several ways to support a variety of applications without any signal loss. The  
EQU Series Graphic Equalizer can be used on a single instrument by connecting to a mixing console's main  
inserts, or on an entire mix "in-line" between a mixing console's outputs and a power amplifier.  
- Wiring Configuration  
Either the 1/4" TRS phone jack or the XLR connector can be wired in balanced and unbalanced modes, which  
will be determined by the actual application status, please wire your system as the following wiring examples:  
1/4"TRS jack  
Unbalanced Input  
1/4"TRS jack  
Balanced Input  
XLR Unbalanced Input  
XLR Balanced Input  
8
 
- In Line Connection  
For these applications the EQU Series Graphic Equalizer provides 1/4" TRS connectors, XLR connectors  
and RCA connectors to easily interface with most any professional audio device. Follow the configuration  
examples below for your particular connection.  
Balanced  
Tip  
Ring  
Tip  
Ring  
Sleeve  
Sleeve  
TIP RING SLEEVE  
SLEEVE RING TIP  
1
2
1
2
3
3
Tip  
Ring  
1
2
3
Sleeve  
TIP RING SLEEVE  
Unbalanced  
Tip  
Ring  
1
2
3
Sleeve  
TIP RING SLEEVE  
Tip  
1
2
3
Sleeve  
TIP SLEEVE  
1
2
3
Centre  
Screen  
Tip  
Tip  
Sleeve  
Sleeve  
TIP SLEEVE  
SLEEVE TIP  
Tip  
Ring  
Tip  
Ring  
Sleeve  
Sleeve  
SLEEVE RING TIP  
TIP RING SLEEVE  
Tip  
Centre  
Screen  
Sleeve  
TIP SLEEVE  
Tip  
Ring  
Centre  
Sleeve  
Screen  
TIP RING SLEEVE  
1
2
1
2
3
3
- Insert Points Connection  
If you are connecting to a mixing console's main inserts, you may have a single TRS jack for SEND &  
RETURN, in this case, use an insert "Y" cable that configured like the examples below.  
1/4" TRS insert  
Insert Leads  
Tip (Send)  
Sleeve  
Tip  
Ring  
SLEEVE TIP  
Tip (Return)  
Sleeve  
Sleeve  
TIP RING SLEEVE  
SLEEVE TIP  
1
2(Send)  
3
Tip  
Ring  
1
TIP RING SLEEVE  
2(Return)  
3
Sleeve  
Centre(Send)  
Screen  
Tip  
Ring  
Centre(Return)  
Screen  
Sleeve  
TIP RING SLEEVE  
4.3. Rack Mounting  
The most secure mounting is on a universal rack shelf available from various rack manufactures or your  
music dealer. The EQU Series fits into one standard 19" rack unit of space, but the EQU131 and EQU215  
will be 1H height, the EQU231TWIN will be 4H height, while the other four models: EQU2215, EQU131VU,  
EQU231VU and EQU231LED will be 2H height. Please allow at least an additional 4" depth for the connectors  
on the rear panel. Be sure that there is enough air space around the unit for sufficient ventilation and please  
do not place the EQU Series on high temperature devices such as power amplifiers etc. to avoid overheating.  
9
 
5. APPLICATION  
5.1 The Sound Frequency  
In recording studios as well as stage or radio plays, the EQU Series Graphic Equalizer will be your  
valuable sound tool to modify the frequency "contour " of a sound .but first of all , you should clearify the  
typical frequency of each instrument and voice, so that can you obtain nice results in terms of sound  
characterization. The tables on the following pages 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 1.3K1.6K 2K 2.5K 3.1K 4K 5K 6.2K 8K 10K 13K 16K 20K  
Hyman gearing  
range VOCAL  
Soprano  
Contralto  
Baritone  
Bass  
WOODWIND  
Piccolo  
Flute  
Oboe  
Clarinet in B flat or A  
Clarinet in E flat  
Bass Clarinet  
Basset Hom  
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 Hom  
STRINGS  
Violin  
Viola  
Cello  
Double Bass  
Guitar  
KEYBOARDS  
Pianoforte  
Organ  
PERCUSSION  
Celesta  
Timpani  
Xylophone  
FREQUENCY  
25 31 40 50 62 80 100 125 160 200 250 320 400 500 640 800 1K 1.3K1.6K 2K 2.5K 3.1K 4K 5K 6.2K 8K 10K 13K 16K 20K  
10  
 
5.2 Equalizer In Sound Reinforcement Systems  
The EQU Series Graphic Equalizers can be used in the sound reinforcement systems to :  
Eliminate unwanted sounds, such as the 60Hz Hum noise.  
Shape the sound by changing the frequency response of the track.  
Special effects like telephone sounds are done by cutting off the low end to 200Hz and the high end  
to 6KHz.  
Allow you to modify the sound of the instrument if put EQU Series Equalizer in line with a musical  
instrument. you can brighten the sound, and body to a thin sounding instrument, or you can give the  
sound a totally different character.  
Fix a track that does not sound quite right, put the EQU Series Equalizer in an effects send and return  
it to the mix bus.  
The following connection is probably most common field of application:  
- Line Instrument  
The EQU 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  
CH1 OUT  
CH2 OUT  
From line instrument  
outputs  
To power amplifier inputs  
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  
LEVEL  
+12 +6  
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
0
-12  
-
6
R
Channel One  
Channel Two  
40Hz  
16 KHz  
CLIP  
6
12  
Dual 31 Band Graphic Equalizer  
EQU231LED  
+12 +6  
0
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
ON  
OFF  
-12  
-
6
40Hz  
16 KHz  
CLIP  
6
12  
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  
LEVEL  
POWER  
- Mixing Console  
The EQU Series Graphic Equalizer can also be used on a single instrument by connecting to a mixing  
console's main inserts, esp for those consoles without built-in equalization circuitry.  
Main Inserts  
CH1 IN  
CH1 OUT  
CH2 IN  
CH2 OUT  
LEVEL  
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  
MIXING CONSOLE  
+12 +6  
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
0
-12  
-
6
R
Channel One  
Channel Two  
40Hz  
16 KHz  
CLIP  
6
12  
Dual 31 Band Graphic Equalizer  
EQU231LED  
+12 +6  
0
+17  
0dB  
-
HI-PASS LOW-PASS  
BY-PASS RANGE  
ON  
-12  
-
6
OFF  
40Hz  
16 KHz  
CLIP  
6
12  
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  
LEVEL  
POWER  
NOTE: Mono/Stereo Application  
a. For mono application, please use the EQU131, EQU131VU mono Graphic Equalizer.  
b. For stereo application, please use the EQU215, EQU2215, EQU231LED, EQU231VU or  
EQU231TWIN stereo Graphic Equalizer, either of the two channels can be used as L/R input  
& output.  
11  
 
6. TECHNICAL SPECIFICATIONS  
Type  
1
2
2
1
2
2
31 Band: 1/3 octave , ISO spacing (1H series)  
15 Band: 2/3 octave , ISO spacing (1H series)  
15 Band: 2/3 octave , ISO spacing (2H series)  
31 Band: 1/3 octave , ISO spacing (2H series)  
31 Band: 1/3 octave , ISO spacing (2H series)  
31 Band: 1/3 octave , ISO spacing (4H series)  
EQU131  
EQU215  
EQU2215  
EQU131VU  
EQU231VU / 231LED  
EQU231TWIN  
Slider travel  
20mm with positive centre detente  
(EQU131/EQU215/EQU231VU/EQU231LED)  
60mm with positive centre detente  
(EQU131VU/EQU2215/EQU231TWIN)  
Range  
6dB or 12dB selectable  
Input connections  
Active balanced XLR and 1/4" TRS  
Unbalanced RCA  
Input impedance  
20k (bal.)  
15k (unbal.)  
Maximum input level  
Output connections  
18dBv  
Active balanced XLR and 1/4" TRS  
Unbalanced RCA  
Output impedance  
Maximum output level  
Load impedance  
High pass filter  
600  
16dBv  
>10K  
40Hz (12dB/oct) fixed-button type .  
16KHz (12dB/oct) fixed-button type  
Low pass filter  
Frequency response  
20Hz to 50KHz at - 3dB  
0.02% (@ 1KHz , all VR at middle position)  
93dB (@ 1KHz )  
THD + N %  
S / N ratio  
Power supply  
110V-120VAC -60Hz  
220V-240VAC -50Hz  
Consumption  
1
2
2
31 band, 1/3 octave, ISO spacing: 7W  
15 band, 2/3 octave, ISO spacing: 9W  
31 band, 1/3 octave, ISO spacing: 12.5W  
EQU131/131VU  
EQU215/2215  
EQU231VU / 231LED/231TWIN  
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) 177.8(H)(19" 8.66" 7") mm (4H series)  
Dimensions  
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 under-  
standing of the sales status, so as to purport a more effective and efficient after-sales warranty service.  
Please fill out all the information carefully and genuinely, miswriting or absence of this card will void your  
warranty service.  
2. RETURN NOTICE  
2.1 In case of return for any warranty service, please make sure that the product is well packed in its original  
shipping carton, and it can protect your unit from any other extra damage.  
2.2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine ,and  
give detail information about your return address and contact telephone number .  
2.3 A brief description of the defect will be appreciated.  
2.4 Please prepay all the costs involved in the return shipping, handling and insurance.  
3. TERMS AND CONDITIONS  
3.1 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  
 

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