Alesis MEQ230 User Manual

A

lesis

DUAL 1/3 OCTAVE PRECISION EQUALIZATION SYSTEM

USERS MANUAL

M-EQ 230

A

lesis

DUAL 1/3 OCTAVE PRECISION EQUALIZATION SYSTEM

M-EQ 230

INTRODUCTION

The Alesis
octave graphic equalizer which features a relay based power-up
delay switching circuit to eliminate turn-on transients in sound
systems.

Each channel features 30 bands of 1/3rd octave equalization with
ANSI and ISO standard center frequencies. Each band is
adjusted by a center detented fader with ±12dB of gain available,
and a master fader controls system gain for that channel. Clip and
signal present LEDs, as well as a bypass switch, are also
provided on each channel.

Inputs and outputs for each channel are via both 1/4" and RCA
jacks. The unit can also be rack mounted in only 1 rack space.

FEATURES

MEQ-230

• 2 complete 30 band 1/3 octave equalizers in 1 rack space

• Power up delay circuitry protects speakers by eliminating turn-on
transients

• ±12dB boost or cut per band

• Each channel can be bypassed individually

• Clip and signal present LEDs for each channel

• Inputs and outputs via both 1/4" phone and RCA jacks

is a two channel, 30 band/channel, 1/3rd

Applications

• Feedback control in sound systems

• Feedback control in stage monitor systems

• Timbre contour of musical instruments

• Room voicing

• Special sound effects

2

SECTION 1

DESCRIPTION OF CONTROLS

FRONT PANEL

1/3 OCTAVE BAND FADER

Each 1/3rd octave band is controlled by a center detented fader
which provides a boost or cut of 12dB. There are 30 bands per
channel.

MASTER CHANNEL GAIN FADER

Each channel has a Master Gain Fader which controls the
system's input gain by ±12dB.

CHANNEL BYPASS SWITCH

Each channel's EQ can be individually bypassed by means of the
Channel Bypass Switch. The Master Gain Fader affects program
input level only when the channel is

EQ IN LED

The EQ In LED lights when the EQ is in use. The LED will go out
when a channel is bypassed.

not bypassed.

CLIP INDICATOR

The red CLIP INDICATOR LED indicates the onset of distortion
(+18 dB). This LED should never light during normal use.

SIGNAL PRESENT LED

The green SIGNAL PRESENT LED indicates that a signal is
currently being fed into the
approximately -20dB and should be frequently lit during normal
use.

POWER LED

The POWER button turns the unit on or off.

M-EQ 230.

This LED lights at

BACK PANEL

INPUT JACKS (Left & Right)

Accepts instrument to line level input signals for both left and right
channels. Both 1/4" and RCA phono jacks are provided.

OUTPUT JACKS (Left & Right)

Line level output of the
Both 1/4" and RCA phono jacks are provided.

M-EQ 230

for both left and right channels.

3

POWER JACK

Accepts the +9VAC power from the

M-EQ 230

Power Supply.
This external supply keeps hum, noise, and ground loops to a
minimum.

SECTION 2

SET-UP

INSTRUMENTS, MICROPHONES

The Alesis
ideally suited for use either with instruments or line level signals.
Although microphones can be connected directly into the

230

, it is recommended that for quietest operation they be

connected to a mixing console first and then connected to the

EQ 230

STEREO OPERATION

For stereo operation of the
line outputs of the device to be equalized into the left and right
inputs of the

M-EQ 230

as described in

M-EQ 230.

has high impedance inputs that are

M-EQ

M-

Figure 1

M-EQ 230

See Figure 1

.

, connect the left and right

FIGURE 1

M-EQ 230 STEREO OPERATION

Alesis 1622

MIXING

CONSOLE

MAIN OUT

LEFT

LEFT INPUT

STEREO

POWER AMP

MAIN OUT
RIGHT

LEFT

INPUT

M-EQ 230

LEFT

OUTPUT

RIGHT INPUT

RIGHT
INPUT

RIGHT
OUTPUT

4