Alesis M-EQ230 User Manual download pdf (Page 7)

SECTION 3

OPERATION

POWER-UP

When the power is first turned on, the automatic power-up delay

circuit will mute the

M-EQ 230

for 2 seconds. This is to prevent

any possible turn-on transient signal from mixers, power amps, or

outboard equipment from possibly damaging speakers.

TO CONTROL FEEDBACK

1) Place all microphones in the positions where they will

be used. Set mics to approximate levels.

2) Gradually bring up the sound system level until

feedback just begins to occur.

3) Feedback will usually occur at two frequencies in each

room; one low and one high. Determine which

frequency is loudest (or that is feeding back first) by

decreasing each slider until one is found that makes the

feedback disappear

(see Figure 4A)

4) After the feedback frequency is found, gradually

increase the slider until just on the edge of feedback.

5) Now gradually decrease the two adjacent sliders until

the feedback again disappears

(see Figure 4B)

6) Gradually increase the sound system gain until

feedback occurs again.

7) Repeat steps 3, 4, and 5.

PLEASE NOTE:

A) In many cases, room acoustics, uneven frequency response

in speaker components and microphones, excessive gain due

to poor microphone technique, poor placement of speaker

systems, or many open microphones in the sound system will

all contribute to feedback which can only be mildly controlled

but not totally eliminated. If excessive EQ is being used it's

best to try to correct some of the reasons for feedback first

before resorting to EQ.

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Alesis M-EQ230 User Manual Page 7