Specifications

9
BLOCK DIAGRAM
SPM412e Block Diagram
1
Level
Control
Logic
Bal
VCA
Limit
Σ
Σ
Σ
Σ
Max
L
R
MAIN
OUTPUT
ZONE
OUTPUT
VCA
Mono/
Stereo
Treble
& Bass
Mic
Mute
Mute
Switch
Matrix
2
3
4
1
REMOTE
+24V
Phantom
Power
Mic/Line
Preamp
Signal
Present
Mute
Logic
IR2 / high
IR3 / low
Threshold
STEREO
LINE
INPUTS
1~4
MIC/LINE
INPUT
GND
R
L
R
L
R
L
-
+
t
signal present
t
mute
Mic
Level
2 3 4
Trim
+10
Main Level
Reference
Meter
-
+
t
-
+
t
-
+
t
Zone
Level
Mic Mic
R
L
30dB
Pad
Channel
Select
Logic
up down mute
Tone
Defeat
Mic
Min
translator