Bedienungsanleitung Alesis MultiMix 12R (Seite 41 von 62) (Englisch)

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Operating Instructions

Multimix 12R Reference Manual 31

By having the correct level at every point in the send/return chain,

you avoid distortion by overloading and avoid noise. The most common

mistake with effect units is to have too low a level at the send or input, then

crank up the output of the processor or the Aux return to get the effects level

desired. This amplifies the noise and wastes headroom. Here is a

procedure that will give good results with most standard equipment:

1. Set your mixer's input levels correctly, following the instructions

earlier in this chapter.

2. Turn up the channels' [AUX 2] sends to the nominal level (marked

by a heavy dot at the “2:00” position).

3. Play the source.

4. Turn up the input level control of the effect device until you see its

meter or signal LED turn red on peaks; then reduce it slightly until

the red doesn't flash. The ideal input level, for optimum noise

performance, is just below clipping. But if other instruments will be

added to the mix later, or levels are unpredictable (as in a live

show), leave yourself additional headroom by turning the input

level down a bit more.

5. The output level of the effect device should be set at or near its

maximum in most cases, unless distortion occurs.

6. Turn up the [STEREO AUX RETURN] level until you get the desired

level of effect in the mix. The one control in the chain that may

need to be set to a low level is the Aux Return (or channel) on the

mixer. Here is where you should increase or decrease the overall

effect level in the mix, for best low-noise performance. If you want

"just a hint" of reverb, don't turn down the Aux 2 send; turn down

the Aux Return. Leave the input levels of the effect device where

they were set in step 4, unless you see the device's overload

indicator flash.

Operating Instructions

Using the meter

The meter of the Multimix 12R is a fast peak type that reads in decibels,

normally displaying the level of the [MAIN OUT] jacks. When the

meter reads "0", the main outputs are at the nominal level: the phono

jacks at -10 dBV (.316 volts) and the 1/4" jacks at +4 dBu (1.24 volts)

balanced, or -2 dBu unbalanced.

Use this reference level to calibrate your system. The input controls of

analog recorders should be set so that “0” on the mixer's meters

equals “0 VU” on the recorder's meters. Digital recorders use a

different reference; for example, an ADAT connected to the Multimix

12R's outputs will read "-15 dB" at nominal output, if you connect to

the proper input jacks (balanced to balanced, or unbalanced to

unbalanced).

The meter follows the [MSTR/TAPE] switch, but not the

PHONES/MONITOR level control. Whatever you hear in the

headphone output, the master output (up position) or the 2-track tape

input (down position) is what the meter is reading.

Output distortion

The Multimix 12R has plenty of headroom, but eventually every

electronic device reaches its limit. At +18 dB over nominal level, the

top LED of the meter labeled PK will light; at this point there is 6 dB of

headroom before the master electronics will clip. Final clipping is

reached at 24 dB over nominal "0" on the meter; this represents a level

of +28 dBu at the MAIN OUT jacks if balanced, +22 dBu if unbalanced,

and +14 dBV at the MAIN OUT -10 dBV phono jacks. Even if no

channel PEAK LEDs are on, with extreme settings of the faders it may

be possible to overdrive the output to this level.

✪ As long as the meter of the Multimix 12R is below its top LED, and the PEAK

LEDs of all channels are off, the mixer should not be causing distortion. If

you hear distortion, check other devices in the signal chain for overload, and

make sure the STEREO channels' PEAK LEDs do not come on when their

TRIM is set to 12 o'clock.

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Alesis MultiMix 12R Seite 41

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