Bedienungsanleitung Alesis MultiMix 12R (Seite 36 von 62) (Englisch)

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Operating Instructions

Multimix 12R Reference Manual 25

OPERATING

INSTRUCTIONS

Before turning the mixer on, "zero out'

the controls

To avoid surprises while you're setting up a new system, set all

controls to their "zeroed out" positions as follows before proceeding:

1. Make all connections to the Multimix 12R, as described in the

previous chapter.

2. Bring all channel faders and the [MASTER] fader down to

minimum.

3. Set all [TRIM] controls to minimum (full counterclockwise).

4. Set all [AUX 1], [AUX 2], STEREO AUX RETURN,

[PHONES/MONITOR] controls to minimum (full

counterclockwise).

5. Set all [HIGH] and [LOW] EQ, [PAN], and [BAL] controls to "12

o'clock".

Operating Instructions

Setting input trim levels

✪ Proper setting of the [TRIM] controls is crucial to low-noise, distortion-

free operation. If the trim is set too high, there will be distortion even

if the channel faders are low. If the trim is set too low and the channel

faders are raised to get the signal loud enough, you will be amplifying

the noise of the mixer.

Instead of doing this, get as much gain as possible as close to the signal

source as possible. If you've plugged a synthesizer or other line-level

source into the Multimix 12R, set its output volume to maximum. If a

microphone is the source, the Multimix 12R's [TRIM] control will

determine the gain of the system.

✪ The goal is to get the signal as loud as possible as early as possible

in the signal path, without causing clipping (distortion) anywhere in

the path or in the sound system.

PEAK LED method

Each channel of the Multimix 12R has its own [PEAK] indicator, which

will light when the signal level rises to within 6 dB of clipping. In

situations where the maximum signal-to-noise ratio is required (such

as digital recording), use the PEAK LED as a guide for setting the

[TRIM] control.

✪ When the PEAK LED is flashing, it does NOT necessarily mean that

distortion has occurred. There is usually some headroom left if the PEAK

LED is flashing momentarily on the loudest peaks.

1. With the sound source active, and the channel fader down to

minimum, raise the [TRIM] control until the PEAK LED flashes

occasionally on the loudest transients.

2. If desired, lower the [TRIM] control slightly until the flashing stops.

Note for extremely high level line inputs in stereo channels: If the

[TRIM] setting is set below unity (12 o'clock position) on a stereo

channel, it is possible for the first input stage to clip without the

PEAK LED coming on. If distortion is still heard after lowering the

trim to its minimum setting, it means the source is extremely high

(+22 dBu or higher). In this case you must lower the output level of

the source, use an external pad, or repatch to a LINE IN on

channels 1-8 (which can take up to +32 dBu levels before clipping).

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