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EQ-231/Graphic Equalizer
EQ-231/Graphic Equalizer
4
ELECTRONICS–Graphic Equalizer Part Number 532251 — 9937
600 Cecil Street, Buchanan, MI 49107
616/695-6831, 616/695-1304 Fax
©EVI Audio 1999 • Litho in U.S.A.
General Specifications
Conditions:
1. 0 dBu = 0.775 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 Figure 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 A-weighted
Front-Panel Controls, Each Channel:
31 center-detent 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 EQ 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,
9.24 in. deep behind mount
Supplied Accessories:
Power cord; one package of mounting
screws; one package of rubber feet; one
decal and fuse for 230-V ac operation;
owner’s 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
1
/
4
-in. phone jack TRS, balanced or
unbalanced
XLR-type Connector Format (IEC Stan-
dard 268):
Pin 1 shield;
Pin 2 high;
Pin 3 low
Output Specifications
Type:
Electronically balanced XLR-type;
unbalanced
1
/
4
-inch
Impedance,
Balanced:
120 ohms
Unbalanced:
60 ohms
Maximum Output Level:
+20 dBu
Filter Specifications
Type:
Variable-Q active filter set
Center Frequencies (31 bands on ISO one-
third-octave centers for each channel):
20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
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
Infrasonic Low-Cut Filter,
Corner Frequency (3 dB down):
43 Hz
Slope:
18 dB per octave