Front And Rear Panels; Input Modules - Yamaha MX400 User Manual

2

Front and rear panels

1
A
B
2
20dB
3
–16 –60
GAIN
PEAK
4
SIGNAL
5
80
–15 +15
HIGH
250
5K
MID FREQ
6
–15 +15
MID
–15 +15
LOW
EQ
0 10
P
7
AUX 1
R
E
0 10
AUX 2
0 10
AUX 3
8
0 10
AUX 4
PRE
P
O
S
T
0 10
AUX 5
MX400 User's Guide
Front and rear panels

Input modules

1
A/B switch
This switch selects the signal source of the input module.
Select INPUT A (XLR type) or INPUT B (1/4" phone type).
2
20dB pad switch
This is a 20dB input pad (attenuator) that affects INPUT A and INPUT B.
If the level of the input signal is too high for adjustments to be made using
the GAIN control alone, use the pad to attenuate the signal to an appropriate
level. The pad is on when this switch is pressed in.
3
GAIN control
This controls the gain of the preamp for INPUT A and INPUT B. Gain is
variable to a maximum of 44dB.
The GAIN control is always used in conjunction with the SIGNAL indicator
and the PEAK indicator. Adjust the GAIN control so that the SIGNAL indi-
cator is always lit when an input signal is present, and the PEAK indicator
lights occasionally. If the PEAK indicator lights frequently, lower the GAIN
control to prevent the signal from distorting.The following table shows
usual settings for the GAIN control.
Signal source
Dynamic mic (low level)
Condenser mic (high level)
Audio device, electronic musical in-
strument (low level)
Audio device, electronic musical in-
strument (high level)
4
SIGNAL indicator and PEAK indicator
When the post EQ signal level (nominal level 0dB) reaches –10dB, the SIG-
NAL indicator will light. This indicator indicates that a signal is being input.
When the post EQ signal level reaches 3dB before clipping level, the PEAK
indicator will light. This indicator indicates that the signal has approached
clipping level. Set the signal level based on the status of the PEAK indicator.
For the procedure, see the explanation for
GAIN control position
–60 ~ –50
–16 –60
GAIN
–35
–16 –60
GAIN
–20
–16 –60
GAIN
+4
–16
–60
GAIN
3
GAIN control.
20dB pad switch
off
off
off
on