Ashly MX-406 Manuale operativo - Pagina 4

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Operating Manual -MX-406 Stereo Microphone/Line Mixer

4. FRONT PANEL CONTROLS

4.1 Input Gain

This three position switch sets the operating level

of the microphone and line input preamp. The correspond-

ing switch values -20db, -40dB, and -60dB refer not to

the actual gain, but rather to the expected nominal input

signal strength.

Best signal to noise ratio is obtained with higher

gain settings. It is therefore desirable to set the gain con-

trol as high as possible while still leaving 20dB of head-

room for signal peaks. Line level inputs (1/4" jack) will

likely use a setting of -20dB, while mic inputs generally

require a setting of -40dB for close mic applications, and

-60dB for quieter signals. If a channel's clip LED is blink-

ing, first turn down that channel's level control. If the

clip LED is still flashing, turn down the input gain.

4.2 Clip

Input Clip LEDs are peak sensitive and monitor

all critical points within the input channel. The clip LED

turns on whenever any portion of the audio path within

the input channel reaches a level 3 dB below actual clip-

ping. Clipping in the MX-406 occurs at +20dB.

4.3 Treble/Bass

This concentric knob is used for broad EQ

changes to each input channel. Channel EQ consists of a

high shelf control (treble) at 4KHz, and a 250Hz low shelf

control (bass). EQ boost or cut is ±12dB.

4.4 Aux

The aux send is an additional level control used to

send signal from each input channel to monitors, an effect

unit, or another mix. The aux master output combines all

six channel's aux level signals. The aux control is factory

set to pre-fader, pre-EQ, but can be internally switched to

post-fader, post EQ. To make this change, refer the fol-

lowing procedure to a qualified service technician:

Unplug the unit's AC power cord from the outlet.

Remove the bottom cover which is fastened by seven 6-32

screws. Locate the 3 pin header labeled AUX at the middle

of the back edge of the front portion of the channel cir-

cuit board. Remove the shunt bar from the "Pre" position

indicated on the circuit board legend and place the shunt

on the "Post" position.

4.5 Level and Pan

This concentric knob adjusts the level and stereo

position of each channel. If a channel's level control is

always turned up to 9 or more, try increasing the gain

first. Conversely, if the level control is consistently turned

down to 1 or less, decrease the gain setting first. Re-

member that the gain setting should be set as high as pos-

sible while still allowing 20dB of headroom.

4.6 Stereo Line In

This control adjusts the level of the stereo line

input RCA jack on the back panel, as well as the 3.5mm

stereo line in jack on the front panel. They can be used for

tape, CD/DVD, or MP3 player audio inputs, and can also

be used for a stereo effect return. Both inputs can be used

simultaneously, but there is only one level control. For