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EPM12
Инструкция по эксплуатации Страница: 22

Soundcraft EPM12 [22/36] Using your epm console

USING YOUR EPM CONSOLE

The final output from your sound system can only ever be as good as the weakest link in

the chain, and especially important is the quality of the source signal because this is the

starting point of the chain. Just as you need to become familiar with the control functions

of your mixer, so you must recognise the importance of correct choice of inputs,

microphone placement and input channel settings. However, no amount of careful setting

up can take account of the spontaneity and unpredictability of live performance. The

mixer must be set up to provide “spare” control range to compensate for changing

microphone position and the absorption effect of a large audience (different acoustic

characteristics from soundcheck to show).

MICROPHONE PLACEMENT

Careful microphone placement and the choice of a suitable type of microphone for the

job is one of the essentials of successful sound reinforcement. The diagrams on the left

show the different pick-up patterns for the most common types of microphone. Cardioid

microphones are most sensitive to sound coming from in front, and hypercardioid

microphones offer even greater directivity, with a small amount of pickup behind the

microphone. These types are ideal for recording vocalists or instruments, where rejection

of unwanted sounds and elimination of feedback is important. The aim should be to

place the microphone as close as physically possible to the source, to cut out unwanted

surrounding sounds, allow a lower gain setting on the mixer and avoid feedback. Also a

well chosen and well placed microphone should not need any appreciable equalisation.

There are no exact rules - let your ears be the judge. In the end, the position that gives

the desired effect is the correct position!

INITIAL SETUP

Once you have connected up your system (see the sections on connection and wiring

earlier in this manual for guidance) you are ready to set initial positions for the controls

on your mixer.

Set up individual input channel as follows:

• Connect your sources (microphone, keyboard etc.) to the required inputs.

WARNING: Phantom powered mics should be connected before the +48V is

switched on. Ensure the PA system is OFF when switching phantom power on

or off.

• Set Master faders at 0, input faders at 0, and set power amplifier levels to about

70%.

• Provide a typical performance level signal and press the PFL button on the first

channel, monitoring the level on the bargraph meters.

• Adjust the input gain until the meter display is in the amber section, with occasional

peaks to the first red LED at a typical maximum source level. This allows sufficient

headroom to accommodate peaks and establishes the maximum level for normal

operation (but see note below).

• Repeat this procedure on other channels as required. As more channels are

added to the mix, the meters may move into the red section. Adjust the overall

level using the Master Faders if necessary.

• Listen carefully for the characteristic sound of “feedback”. If you cannot achieve

satisfactory input level setting without feedback, check microphone and speaker

placement and repeat the exercise. If feedback persists, it may be necessary to

use a Graphic Equaliser to reduce the system response at particular resonant

frequencies.

Soundcraft EPM12 [22/36] Using your epm console

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