Allen&Heath PA28 - Manual (Page 33)

PA User Guide 33
System Block Diagram
Connector Types
XLR connector : Pin 2 = hot (+) Pin 3 = cold (-) Pin 1 = GND
TRS input and output connectors : Tip = hot (+) Ring = cold (-) Sleeve = GND
RCA phono : Pin = signal Sleeve = GND
Input Connections
Type Impedance Sensitivity
Mono MIC IN Balanced XLR female 2k ohm -63 to +5dBu
Mono LINE IN Balanced TRS jack >30k ohm -25 to +10dBu
ST1,3 LINE IN L,R Unbalanced RCA phono >10k ohm -10dBu max
ST2,4 LINE IN L,R Unbalanced TRS jack >10k ohm -10dBu max
2-TRK IN L,R Unbalanced RCA phono >10k ohm 0dBu
EXT FX IN L,R Unbalanced TRS jack >10k ohm 0dBu
Output Connections
Type Impedance Level
A, B MAIN OUT Electronically balanced XLR <75 ohm 0dBu
L, R, MONO, Impedance balanced TRS jack <75 ohm 0dBu
A, B SLAVE OUT Impedance balanced TRS jack <75 ohm 0dBu
FB1, FB2, AUX, FX OUT Impedance balanced TRS jack <75 ohm 0dBu
2TRK OUT Unbalanced RCA phono <75 ohm 0dBu
2TRK OUT (SPDIF) RCA phono 75 ohm coax digital
HEADPHONES Tip = L Ring = R 30 to 600 ohm, 100 ohms recommended
Insert Connections
Type Level
Channel, LR Unbalanced TRS tip = send, ring = return 0dBu
PP
FADER
PFL
PEAK
STEREO CHANNEL
FX
AUX
FB2
FB1
LF
ST2/4
R
L
R
L
GAIN
ST1/3
+
+
-
LINE IN
+48V
INSERT
MUTE
PAN
DIR OUT
GAIN
LR
SUM
HF
2 BAND EQUALISER
LF
FADER
PFL
PEAK
FX
AUX
FB2
FB1
MUTE
BAL
SUM + SUM
EXT FX IN
R
L
GAIN
+
SUM
FADER
PFL
PEAK
FB2
FB1
MUTE
+ SUM + SUM
FX MUTE FOOTSWITCH
FX CHANNEL
INTERNAL FX
SELECT 1-16 / OFF
L INSERT
R INSERT +
SUM
MUTE
L
R
R
L
2TRK IN
PRE POST
R
L
ANALOG
ADC
2TRK OUT
SPDIF DIGITAL
+
SUM
MONO OUT
MAIN LR
2TRK
MONO
LEV
HPF
100Hz
SUB
FADER MUTE
AFL
FB1 OUT
FB1
FADER MUTE
AFL
FB2 OUT
FB2
AUX
AUX OUT
FX
FX OUT
PF
L
FX AUX FB
2
FB
1
R L
PHONES
R
L
HEADPHONES
LR / 2TRK
LM HM HF
4 BAND EQUALISER
LF
A
B
LEV
LEV
SIGNAL
PEAK
A
SLAVE OUT
LEV PEAK
SIGNAL
B
A OUT B OUT
FADERS
PFL/AFL
MONITOR
CHAN
PFL
MAIN OUT
2TRK TO LR
BGM
+
SUM
METERS
SEL
FB2 R + L R
FB1 L FB1
SOURCE SELECT
LM HM HF LF
+
-
GAIN
LM HM HF
4 BAND EQUALISER
MONO CHANNEL
100Hz
MIC IN