Viking Electronics E111 instruction manual General Description, Features

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 each filter is continuously variable from 1.5 to 8. Its signal to noise ratio is over 120dB making the E 111 and E 112 one of the quietest equalizers on the market.

The active bandpass/bandreject filters of the E 111 and E 112 are designed for minimum phase shift, and feature smooth slide controls with center detents for easy and accurate adjustment. The filters are summed in parallel for reliability, so that the failure of one filter does not interrupt operation of the others.

In addition, high-pass and low-pass filters are provided on the front panel. The high-pass filter has a slope of 12 dB per octave and its cutoff frequency is 40Hz, while the low-pass filter has a 12 dB per octave slope and its cutoff frequency is 12kHz.

An input level control on the E 111 or E 112 gives 12 dB of adjustment to allow a wide variety of input sources. An LED indicator illuminates when either the input or the output comes within 6 dB of clipping. In addition to the usual EQ in/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 smoked plastic security cover is included with the E 111 or E 112 to guard against accidental disturbance, or intentional tampering when used in fixed installations.

Inputs and outputs are transformer-isolated and balanced, with both XLR and 1/4" stereo phone jacks. Ground lift switches are provided at both inputs and outputs to reduce hum and prevent ground loops.

The E 111 and E 112 can be mounted in a standard 19" rack and occupy 5-1/4" of vertical space. The rugged front panel is made of 1/8" (3mm) cast aluminum, backed with a 1/8" (3mm) steel liner for added durability.

Features

1.10 filters per channel on ISO 1/1 octave center frequencies from 31.5Hz to 16kHz.

2.12dB boost or cut at each center frequency, continuously variable.

3.Continuously variable center frequency control at each frequency over a one octave range.

4.Continuously variable "Q" control at each frequency from 1.5 to 8.

5.Signal to noise ratio greater than 120dB.

6.High quality, low phase-shift active filters.

7.Precision calibrated, noiseless slide controls with center detent.

8.Equalizer In/Out switch.

9.High- and low-pass filters.

10.LED peak indicator to detect clipping at input or output levels.

11Variable input level control to accept variety of input sources.

12.Automatic EQ bypass circuitry.

13.Transformer-isolated balanced inputs and outputs with XLR connectors and phone jacks.

14.Ground lift switches on input and output.

15.Smoked, plastic security cover is included.

16.Heavy aluminum die-cast front panel, stand- ard 19" rack mountable.

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