MPA685 Owner’s Manual
3/2012
6
+48V
DIRECT
INPUT
MIC INPUT
GAIN
STAGE
BUFFER &
POS/NEG
PEAK
DETECTOR
OVERLOAD
LED
BUFFER
BUFFER
LOW FREQ
RESPONSE
SWITCH
OUTPUT
BUFFER
OUTPUT
LEVEL POT
STEPPED
SWITCH
ATTN
DIRECT
LOOPTHRU
GAIN
STAGE
GAIN
STEPPED
SWITCH
MIC Z
BLOCK DIAGRAM
A block diagram of the MPA685 is shown below.
Some units are also equipped with ¼” balanced phone jacks connected to the input XLR
connector.
