Vizio E 131 instruction manual General Description, Features, applications

General Description

The TOA E 131 is a single channel, 1/3 octave active graphic equalizer designed to allow clean, accurate audio equalization for stage, studio, or commercial

applications.

The E 131 provides 12 dB of boost or cut at each of its 28 frequencies, which are centered at ISO 1/3 octave increments from 31.5 Hz to 16 kHz. Its signal to noise ratio is over 120 dB making the E 131 one of the quietest equalizers on the market.

The E 131's active bandpass/bandreject filters 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, continuously variable high-pass filters are provided on the front panel. The high-pass filter has a slope of 18 dB per octave and is variable from 15 Hz to 120 Hz, while the low-pass filter has a 12 dB per octave slope and is variable from 8 kHz to 25 kHz.

An input level control on the E 131 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 131 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 131 can be mounted in a standard 19" rack and occupies 3-1/2" 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

1.28 filters on ISO 1/3 octave center frequencies from 31.5 Hz to 16 kHz.

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

3.Signal to noise ratio greater than 120 dB.

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

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

6.Equalizer In/Out switch.

7.Continuously variable high- and low-pass filters.

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

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

10.Automatic EQ bypass circuitry.

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

12.Ground lift switches on input and output.

13.Smoked, plastic security cover is included.

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

- 2 -