Handleiding Alesis MultiMix 12R (pagina 39 van 62) (Engels)

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Operating Instructions

Multimix 12R Reference Manual 29

Proper gain staging of other equipment

The total noise performance of your system depends on proper gain

control of all the elements. A "noisy mixer" is usually a quiet mixer in a

system whose gain structure is incorrect. As a good starting point, set

most volume level controls of other equipment at 3/4 or 75% of full.

This will decrease the possibility of overload distortion and keep the

amount of background noise to a minimum.

Turn down amplifier levels: In particular, don't set the input controls

of a power amplifier "wide open" if you have to run the faders of the

mixer in the bottom half of the travel (and the meter of the Multimix

12R well below the "0" mark) to keep the system from being too loud

or feeding back. It's better to run the mixer at its normal level, and

turn down the amplifier's controls for the desired level. By turning the

amplifier's own volume controls down, you turn down the residual

noise of everything that precedes it in the signal chain, resulting in a

quieter, more controllable system.

However, if the mixer output is too loud, and the input stage of the

amplifier being used is an active circuit (instead of a passive voltage

divider type), it is possible to clip the preamp stage of the amplifier and

cause nasty distortion even if the amp level is low. Use good

judgment and consult the manual for your amplifier for more

information.

Distortion caused by EQ: If a large amount of EQ is used, it may

become necessary to decrease either the trim control, or the channel

fader, or both. The EQ is capable of adding quite a bit of gain and is a

frequent cause of overload distortion problems. The PEAK LEDs

monitor the signal after the EQ circuit, both pre and post fader.

Operating Instructions

AUX System: Effects Send/Receive

The AUX 2 buss of the Multimix 12R is a post-fader send. Usually, you

will connect AUX 2 to the input of an effect device. Using a post-fader

send means that when you fade a channel out, its effects will fade out

also.

Using the aux send allows each channel to have its own level control

feeding the aux output (and eventually the input of the effect device).

You can make a mix of any channels you want to go to the effects by

using the individual channels’ aux send levels.

But sending signal to the effect device is only half the story. To be

heard, the output of the effect device must be returned to the mixer

and turned up in the mix before you can hear it. You have two

options for returning the effected signal to the mix:

• connecting to the STEREO AUX RETURN jack, or

• connecting to the channel LINE IN or STEREO LINE IN jacks.

Connecting to channel inputs gives you the added bonus of panning

and EQ on the effects, and the ability to send a “wet” or effected mix to

AUX 1 for monitoring.

Wet/dry mix: No matter where you connect the output of the effect

unit into the mixer, you are in control of the “wet/dry” balance

between the mixer’s channel inputs (the uneffected or “dry” signal),

and the effect returns coming from the effect device (the “wet” signal).

The output of the effect device should only contain effected signal, and

not have any uneffected or "dry" signal mixed with it (since the dry

signal is already at the mixer). Consult the manual for the effect

device to find out how to set the effect so that only effected ("wet")

signal is returned to the Multimix 12R.

How to Set Aux Send and Return Levels

You must set correct levels on the mixer's individual Aux Sends and

STEREO AUX RETURN and the effect device's own controls to get

good, clean, quiet results.

✪ Improper level setting is the most common cause of noise and distortion

problems.

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