Operating I n s t r u c t i o n Manual TOA PROFESSIONAL GRAPHIC EQUALIZER Model E 111, E 112 E 111 E 112 TOA ELECTRIC CO,LTD.
Contents Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description The TOA E 111 is a single channel, 1/1 octave active graphic equalizer designed to allow clean, accurate audio equalization for stage, studio, or commercial applications, while the E 112 is a double channel version. The E 111 and E 112 provide 12dB of boost or cut at each of its 10 frequencies per channel, which are centered at ISO 1/1 octave increments from 31.5Hz to 16kHz.
Specifications Frequency Response ±ldB, 20Hz to 20kHz Total Harmonic Distortion Less than 0.2% at 1kHz, all sliders at 0 position, rated output Equalization Center Frequencies From 31.5Hz to 16kHz peaking type 31.5Hz (22Hz to 44Hz) 63Hz (44Hz to 88Hz) 125Hz (88Hz to 176Hz) 250Hz (176Hz to 350Hz) 500Hz (350Hz to 700Hz) 1kHz (700Hz to 1.4kHz) 2kHz (1.4kHz to 2.8kHz) 4kHz (2.8kHz to 5.5kHz) 8kHz (5.
Performance Graphs FREQUENCY RESPONSE (Each slider is set at a max position) FREQUENCY RESPONSE (ex. 1kHz slider) FREQUENCY FREQUENCY CENTER FREQUENCY CONTROL (ex. 1kHz slider) BANDWIDTH CONTROL (ex.
Front Panel E 111 E 112 Equalizer LED indicator Allows a d j u s t m e n t of frequency response by using t h e EQ sliders , bandwidth controls and C e n t r e frequency controls while the LED remains lit. The frequency response is flat regardless of t h e position of the EQ sliders when the LED is extinguished. Select e i t h e r of the frequency modes with t h e equalizer switch Peak LED indicator Lights when the o u t p u t exceeds 6dB before a clipping level is reached.
Front Panel Power LED indicator It is possible to operate the E 111 and E 112 equalizers while the LED remains lit. While the LED is OFF, the signal fed to the rear-mounted input connector or jack is delivered to the output connector or jack as it is. Power switch Pushing this switch causes the power LED to light and puts the equalizer in the operation mode.
Input/Output Connections Mixing Console (RX-7) Power Amplifier P 150D E 112 Speaker System 38-SD×2 Installation Precautions Ground Loops In any audio system, there are numerous ways by which ground loops can be created. For example, they may occur when the E 111/112 are mounted in a rack cabinet, or through AC ground when the E 111/112 are connected with preamps, mixers, etc. These ground loops may cause hum and noise if care is not taken during connection.
Installation Precaution On the road use The E 111/112 are sturdily constructed with an aluminum die-cast front panel that is reinforced by means of an iron plate attached to its back. To ensure that strength is maintained during their transportation from one place to another, however, you should also reinforce each unit from the back of the rack with a special support bracket.
Applications Feedback Prevention When the overall gain of a sound system is increased, feedback will occur at frequencies where the system response has peaks. Suppose the system has an uneven frequency response like that shown in the following diagram. The frequency at which feedback will occur when gain is increased is about 500Hz. In this case, feedback may be prevented by attenuating levels at 500Hz by 5dB to 7dB with the E 111/112.
Applications Equalization for music The Graphic Equalizer is designed not only for use in preventing feedback and equalizing uneven room frequency response to be flat, but also for equalizing frequency response to your tastes and producing favourable sound for you. Fig. 1 shows each frequency band and its corresponding auditory feeling. Fig. 2 and Table 1 show the relation between each musical instrument and its frequency band. They can be of great help in the equalizer operation.
TOA ELECTRIC CO, LTD.
