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Operating Instruction Manual
TOA PROFESSIONAL GRAPHIC EQUALIZER
Model E 111, E 112
E 111
E 112
TOA ELECTRIC CO, LTD.
KOBE, JAPAN
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Contents Precautions ................................................ 1 General Description ........................................ 2 Features ................................................... 2 Specifications ............................................. 3 Appearance ................................................ 3 Performance Graphs ....................................... 4 Front Panel ................................................ 5 Rear Panel ..........................................
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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. The center frequency of each filter is continuously variable over a range of one octave and the "Q" of
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Specifications Frequency Response Input Impedance ±ldB, 20Hz to 20kHz 10k ohms Total Harmonic Distortion Output Impedance Less than 0.2% at 1kHz, all sliders at 0 600 ohms position, rated output High Pass Filter Equalization Center Frequencies 40Hz, 12dB/octave From 31.5Hz to 16kHz Low Pass Filter peaking type 12kHz, 12dB/octave 31.5Hz (22Hz to 44Hz) Hum and Noise 63Hz (44Hz to 88Hz) -103dB* (EQ IN, all sliders at 0 position, A 125Hz (88Hz to 176Hz) curve by IHF) 250Hz (176Hz to 350Hz) Protect 5
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Performance Graphs FREQUENCY RESPONSE (Each slider is set at a max position) FREQUENCY RESPONSE (ex. 1kHz slider) FREQUENCY FREQUENCY CENTER FREQUENCY CONTROL BANDWIDTH CONTROL (ex. 1kHz slider) (ex. 1kHz slider) FREQUENCY FREQUENCY — 4 —
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Front Panel E 111 E 112 Equalizer LED indicator Allows adjustment of frequency response by using the EQ s l i d e r s , bandwidth controls a nd Centre frequency controls while the LED remains lit. The frequency response is flat regardless of the position of the EQ sliders when the LED is extinguished. Select either of the frequency modes with the equalizer switch Peak LED indicator Lights when the output exceeds 6dB before a clipping level is reached. For minimum noise, adjust the input contr
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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. By again pushing the switch, the power LED can be extinguished, permitting the input fed to the rear- mounted input connector or jack to be
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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. An increase in noise from ground loops
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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. This can be accomplished by removing cord-hangers on the rear panel, and screws that hold the rear panel to chassis, and
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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. If the overall gain is again gradually increased, feedback w
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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. (They are refe
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TOA ELECTRIC CO, LTD. KOBE, JAPAN Printed in Japan 133-02-688-3
