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OPERATING INSTRUCTIONS

GRAPHIC EQUALIZER

E-1231

Thank you for purchasing TOA's Graphic Equalizer. 
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

1. IMPORTANT SAFETY PRECAUTIONS 

..... 2

2. SAFETY PRECAUTIONS 

........................... 2

3. GENERAL DESCRIPTION 

......................... 4

4. FEATURES 

................................................. 4

5. HANDLING PRECAUTIONS 

...................... 4

6. NOMENCLATURE AND FUNCTIONS

Front ............................................................ 5
Rear ............................................................. 6

7. BLOCK DIAGRAM 

..................................... 7

8. DIMENSIONAL DIAGRAM 

......................... 7

9. SPECIFICATIONS 

...................................... 8

Accessories ................................................. 8

TABLE OF CONTENTS

Summary of Contents for E-1231

Page 1: ...tructions in this manual to ensure long trouble free use of your equipment 1 IMPORTANT SAFETY PRECAUTIONS 2 2 SAFETY PRECAUTIONS 2 3 GENERAL DESCRIPTION 4 4 FEATURES 4 5 HANDLING PRECAUTIONS 4 6 NOMENCLATURE AND FUNCTIONS Front 5 Rear 6 7 BLOCK DIAGRAM 7 8 DIMENSIONAL DIAGRAM 7 9 SPECIFICATIONS 8 Accessories 8 TABLE OF CONTENTS ...

Page 2: ...ns Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or groundi...

Page 3: ... the power supply plug never pull on the cord itself Operating the unit with a damaged power supply cord may cause a fire or electric shock When moving the unit be sure to remove its power supply cord from the wall outlet Moving the unit with the power cord connected to the outlet may cause damage to the power cord resulting in fire or electric shock When removing the power cord be sure to hold it...

Page 4: ...n out switch an automatic EQ bypass function provides complete equalization bypass in the event of loss of AC power and an output muting function suppresses turn on turn off transients A security cover is included with the E 1231 to guard against accidental disturbance or intentional tampering when used in fixed installations The E 1231 can be mounted in a standard 19 rack and occupies 3 1 2 of ve...

Page 5: ...ecords 7 Equalizer sliders These sliders are adjusted to tune or equalized the overall frequency response of a sound system 8 Equalizer indicator LED The indicator LED turns on whenever the equalizer IN OUT switch is IN 9 Equalizer IN OUT switch Equalizer switch puts the input signals either in circuit or out of circuit of the equalizer The OUT position provides flat audio response no matter what ...

Page 6: ... connected to other equipment In such cases cut the loop by removing a short piece which should usually be mounted to the terminal Note This ground is not for protective ground 17 Output screw terminal The output terminal is balanced and 600 ohms in output impedance Place the supplied short piece between E and C to convert to unbalanced type 18 Input screw terminal The input terminal is balanced a...

Page 7: ...H C E FUSE AC MAINS PT PEAK 15 V 15 V 12 V POWER EQ EBA HPF LPF LPF SLOPE FILTER H C E EBA INPUT POWER SUPPLY BA 8 DIMENSIONAL DIAGRAM Unit mm in Rear Front Front without security cover Security cover 466 18 35 482 6 19 300 11 81 317 2 12 48 280 11 02 4 7 10 5 Side 76 2 88 4 3 3 48 ...

Page 8: ...ximum Output Level 20 dB with 600 Ω load Input Impedance 10 kΩ Output Impedance 600 Ω Hum and Noise 94 dB EQ in all sliders at 0 position 20 Hz 20 kHz BPF Indicators A red LED for output and input clipping A green LED for equalizer IN A green LED for power ON A green LED for filter IN Controls Equalizer Sliders 12 dB Input Level Control 12 dB Highpass Filter 12 dB per octave Adjustable Cutoff Freq...

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