EQ-231/Graphic Equalizer

EQ-231/Graphic Equalizer

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:

120ohms Unbalanced:

60ohms

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

600 Cecil Street, Buchanan, MI 49107

616/695-6831, 616/695-1304 Fax

ELECTRONICS–Graphic Equalizer

©EVI Audio 1999 • Litho in U.S.A.

Part Number 532251 — 9937

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Electro-Voice EQ-231 General Specifications Conditions, Noise at Unity Gain, Front-Panel Controls, Each Channel, Colors
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EQ-231 specifications

The Electro-Voice EQ-231 is a professional 31-band graphic equalizer designed to provide precise control over sound quality in various audio environments. This versatile piece of equipment is particularly suited for live sound reinforcement, studio recording, and permanent installation applications. With its impressive range of features and advanced technologies, the EQ-231 offers both audiophiles and professionals a robust tool to achieve optimal audio performance.

One of the standout features of the EQ-231 is its 31 bands of 1/3-octave equalization, covering the frequency range from 20 Hz to 20 kHz. This extensive band configuration allows for meticulous adjustments to frequency response, enabling users to tailor the sound to specific environments or preferences. Each band is equipped with a central LED indicator, providing real-time visual feedback that enhances usability, especially during live performances.

The EQ-231 utilizes a high-quality, low-noise design that minimizes signal degradation. This results in cleaner sound reproduction while ensuring that the audio maintains its integrity through multiple processing stages. The unit also incorporates a switchable 12 dB/octave high-pass filter, which helps eliminate unwanted low-frequency rumble and protects speakers from damage during high-volume performances.

One of the defining characteristics of the EQ-231 is its superior build quality. The rugged metal chassis is designed to withstand the rigors of touring and live use, making it an ideal choice for professionals who require equipment that can endure the demands of the road. Additionally, the front panel features easy-to-read graphics and a user-friendly layout, allowing for quick adjustments without disrupting the performance.

In terms of connectivity, the EQ-231 offers balanced XLR and TRS inputs and outputs, ensuring compatibility with a wide range of audio equipment. This flexibility makes it suitable for integration into various audio systems, from small venues to large concert halls.

Overall, the Electro-Voice EQ-231 is a powerful graphic equalizer that combines advanced technologies and practical features. Its precision, durability, and user-friendly design make it an essential tool for sound engineers and musicians alike, allowing for seamless control and enhancement of audio quality in any setting. Whether for live sound, recording, or installation, the EQ-231 stands out as a reliable choice that meets the demands of the professional audio industry.
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