ALESIS M-EQ230 - Manual (Page 7)

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.