Electro voice eq 231 owners manual

Page 1

GENERAL SPECIFICATIONS
Conditions:

1. 0 dBu - 0775 volts rms.

2. 120 volt ac line input voltage maintained

for all tests unless noted.

3. 0 dBm - 1 mW into 600 ohms.
Frequency Response at Unity Gain.
High-Pass Filter Disengaged
(see Flgure 4):

20 Hz - 20,000 Hz :1 dB
Total Harmonic Distortion at Unity Gain,
20 - 20,000 Hz, 0 dBu Output:

<0.01%

Noise at Unity Gain:

<-97 dBm Alweighted
Front-Panel Controls. Each Channel:

31 center-detant boost/cut slide controls;

level control with center detent; low-cut

select switch; range select switch; EQ-on
switch
LED Indicators. Each Channel:

Peak output level; 6- or 12-dB range and

E0 on
Chassis Construction:

Painted steel
Colors:

Gray front panel with white nomenclature;

black top. sides. rear and bottom.
Mounting:

Standard 19-in. rack, 3.46 in. high. 924 in.

deep behind mount
Supplied Accessories:

Power cord: one package of mounting

screws; one package of rubber feet: one

decal and fuse lor 230-V ac operation;
owners manual and service information
Operating Environment:
Up to 50° C (122° F)
Power Requirements:
110 or 220 V ac. 50/60 Hz,18 watts

Overall Dimensions (see Figure 1):
88 mm (3.46 in.) high;
483 mm (19.0 in.) wide:
235 mm (9.24 in.) deep
Net Weight:
4.0 kg (8.8 lb)

INPUT SPECIFICATIONS
Type:
Electronically balanced
Impedance,
Unbalanced:
22,000 ohms
Balanced:
44,000 ohms
Maximum Input Level at Unity Gain:
+20 dBu (7.75 V rms)
Connectors,
Type:
Parallel female 3-pin XLR-type and lt-in.
phone jack TRS. balanced or unbalanced
XLR-type Connector Format
(IEC Standard 268):
Pin 1 shield;
Pin 2 high;
Pin 3 low

OUTPUT SPECIFICATIONS
Type:
Electronically balanced XLR-type:
unbalanced Winch
Impedance,
Balanced:
120 ohms
Unbalanced:
60 ohms
Maximum Output Level:
+20 dBu

EIecIroTl/oicei

0 MARK IV company

Ell-231

Graph c Equalizer

FILTER SPECIFICATIONS
Type:
Variable-Q active tiller set
Center Frequencies (31 bands on ISO cne-
third-octave centers Itor each channel):
20, 25, 32. 40. 50. 63. 80. 100. 125. lSO.
200. 250. 315. 400. 500, 630, 800. 1,000.
1,250. 1.600. 2,000. 2,500. 3,150. 4.000.
5.000, 6.300. 8.000. 10.000, 12.500,
16.000 and 20,000 Hz
Maximum Boost/Cut
12 dB
lnirasonic Low-Cut Filter.
Corner Frequency (3 :13 down):
43 Hz
Slope:
18 dB per octave

DESCRIPTION

The Electra-Voice E0231 is a boost-and-cut
steteola-octave graphic equalizer whose
primary use is for tuning the overall frequency
response of a sound reinforcement system,
both to increase gain-beforevfeedback and to
compensate tor the deficiencies in the
acoustic environment and the sound system.

FEATURES

The variable-Q active iilter sets used in the
E0231 allow effective equalization with law
problematic side effects. As Figure 1
illustrates, the filter characteristics vary with
the amount of boost or cut used. At low
control settings, the filter Q is very wide. As
the control is boosted or cut. the filter 0
narrows so that there is minimum interaction
between adjacent frequency bands.

Each oi the 31 ls-octave filters per channel
provides 12 dB cl boost or cut at ISO
frequencies 20 through 20,000 Hz (see