AlesisM-EQ 230
DUAL 1/3 OCTAVE PRECISION EQUALIZATION SYSTEM
USERS MANUAL
Alesis M-EQ 230
DUAL 1/3 OCTAVE PRECISION EQUALIZATION SYSTEM
INTRODUCTION
The Alesis MEQ-230 is a two channel, 30 band/channel, 1/3rd 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
•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
Applications
•Feedback control in sound systems
•Feedback control in stage monitor systems
•Timbre contour of musical instruments
•Room voicing
•Special sound effects
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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 not bypassed.
EQ IN LED
The EQ In LED lights when the EQ is in use. The LED will go out when a channel is 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 M-EQ 230. This LED lights at approximately -20dB and should be frequently lit during normal use.
POWER LED
The POWER button turns the unit on or off.
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 M-EQ 230 for both left and right channels. Both 1/4" and RCA phono jacks are provided.
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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 A lesis M-EQ 230 has high impedance inputs that are ideally suited for use either with instruments or line level signals. Although microphones can be connected directly into the M-EQ 230, it is recommended that for quietest operation they be connected to a mixing console first and then connected to the M- EQ 230 as described in Figure 1.
STEREO OPERATION
For stereo operation of the M-EQ 230, connect the left and right line outputs of the device to be equalized into the left and right inputs of the M-EQ 230. See Figure 1
FIGURE 1
M-EQ 230 STEREO OPERATION
Alesis 1622
MIXING
CONSOLE
MAIN OUT |
MAIN OUT |
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LEFT |
RIGHT |
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LEFT |
RIGHT |
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INPUT |
INPUT |
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M-EQ |
230 |
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LEFT |
RIGHT |
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OUTPUT |
OUTPUT |
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LEFT INPUT |
RIGHT INPUT |
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STEREO |
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POWER AMP |
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