Bedienungsanleitung Alesis MultiMix 12R (Seite 38 von 62) (Englisch)

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Operating Instructions

Multimix 12R Reference Manual 27

Metering/Unity Gain method

This method gives you more headroom than the peak method, while

maintaining a low noise floor which will be well below the noise of

most PA or live recording environments.

1. With the mic or line level signal flowing through the channel, set

the TRIM to minimum.

2. Set the CHANNEL FADER to 0 (about 2/3 up). Set all other

channel faders to minimum (off).

3. Set the MASTER fader to 0 dB (all the way up).

4. Observe the Multimix 12R's LED Meter. Adjust the [TRIM]knob

until the average signal level on the meter is about 0 dB (highest

green LED), or peaks do not exceed the +10 dB LED (or whatever

maximum your system is designed for). If you ever see the

channel's PEAK LED flash, you are within 6 dB of signal overload.

Turn down the TRIM knob until the PEAK LED stops flashing.

Operating Instructions

Typical Fader and Control Levels

Ideally, after you have set the [TRIM] controls, both the Channel and

Master faders should be run between the -10 dB and 0 dB position

(about 1/2 to 3/4 of the way up the fader travel on the channels, and

3/4 to full on the master) if possible. This position gives the greatest

amount of headroom and low noise. It also allows for any additional

increase or decrease in level that might be required during mixing.

Ultimately, the fader levels are dependent on the requirements of the

mix; these suggestions are only a starting point.

Unity gain points

Unlike many other mixers, the Multimix 12R's [MASTER] fader is

designed for unity gain (0) when the fader is up full, not at 3/4 or 1/2

of the travel. This allows you greater control to use the fader for

smooth, gradual fade-outs. It also discourages inexperienced

operators from using the mixer incorrectly.

The channel faders' unity gain point is at the traditional 3/4 point, with

10 dB of gain at the full-up position.

Trim gain ranges

The amount of gain in the TRIM circuit is shown on the front panel.

On channels 1-8, the LINE input ranges from 10 dB attenuation to 40

dB gain, a range that should cover almost any line signal. The MIC

input ranges from +10 dB to +60 dB gain, since the very low output

voltages of microphones need to be amplified a great deal. The stereo

channels' TRIM controls can be set from -15 dB attenuation to +15 dB

gain. See the Level Diagram near the end of this manual for a graphic

display of the gain structure of the mixer.

Aux Send levels

The nominal or unity gain points of the Aux 1 and Aux 2 controls are

at the “2 o’clock” position. At the full clockwise setting, they have 10

dB of gain. However, in most applications you won’t need that gain, if

the TRIM controls have been set properly. (See “How to Set Aux Send

and Return Levels” later in this chapter for more information.)

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