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JBL
Music Mixer
CSMA 280
JBL CSMA 280 User Manual
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26
Appendix B :
Bloc
k Diagram
Figure C CSMA 2120/280/240 Block Diagram
∑
CH2
TO
AMP1
CH8 TO AMP1
CH1
TO
AMP1
CH1 TO AMP2
SW
1
SW
2
CH
2 TO
AMP1
CH2
TO
AM
P2
SW
7
SW
8
CH5
TO
AMP2
CH
5 TO AMP1
CH3 & CH4 Similar to CH
2
CH7 & CH8 Similar to CH
6
In
pu
t Gain
Line
Mi
c
Input
Gain
Li
ne
Mi
c
In
put
Ga
in
Line
Mi
c
Input
Gain
Li
ne
Mi
c
CH
1
CH
2
CH5
CH6
Phanto
m
Po
we
r
Mi
c/Line
[Bal
]
Mi
c/Line
[Bal
]
Mi
c/Line
[Bal
]
Mic/Line
[Bal
]
CH1 PT
T
CH5 PT
T
RC
A
[MONO
SU
M]
RCA
[MON
O
SUM]
Gain
1
Gain
2
SP
I
SP
I
CH1 VO
X
CH5 VO
X
Gain
5
Gain
6
CH6 TO AM
P2
CH6
TO AM
P1
CH1 Priority
CH1
TO
AMP2
CH8
TO
AMP2
CH
5 TO AMP2
(E
xclude)
(SW6
)
∑
CH1 TO AMP2
CH
5 TO AMP2
(Closed as CH
1 Rout
e
to AMP2
)
CH5 Priority
SP
I
SP
I
∑
Attenuation
∑
Attenuation
OR
OR
OR
T
one Co
ntrol
Scal
in
g
Power
AMP1
Output
XFMR
HPF CNTL
+
-
COM
100V
70.7
V
To
ne Co
nt
ro
l
Scal
in
g
Powe
r
AMP2
Output
XFM
R
HPF CNTL
+
-
COM
100V
70.7
V
Preamp Line Out
1
Preamp Line Ou
t
2
VCA
1
VCA
2
(SW5
)
(SW11)
Mast
er
1
Master
2
SP
I
1C
li
p
1
Limiter
Limiter
SP
I
2
Clip
2
Bass
Treble
Ba
ss
Treble
VC
A
VC
A
HP
F
HP
F
25
27
Table of Contents
Default Chapter
2
Table of Contents
2
Important Safety Information
3
Important Safety Instructions
3
Jbl Declaration of Conformity
5
1 Welcome
7
Features
7
Front Control Panels and Indicators
8
Front Panel Controls and Indicators
8
Rear Panel Controls and Connectors - Four Channel
9
Rear Panel Controls and Connectors - Eight Channel
10
Important Safety Instructions
12
2 Setup
12
Unpacking Your Amplifier
12
Installing Your Amplifier
12
Ensuring Proper Cooling
17
Choosing Input Wire and Connectors
17
Output Wiring and Connectors
18
Wiring Your Audio System
19
Connecting to AC Mains
20
Protecting Your Speakers
20
Startup Procedure
20
3 Operation
21
Precautions
21
Input Routing
22
Phantom Power
22
Priority Muting
23
Remote Volume Control
23
Sleep Mode
23
AUX Output
23
4 Troubleshooting
24
Appendix A: Target Performance Specifications
25
Appendix B: Block Diagram
26
Appendix C: Contact Information
28
4
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JBL CSMA 280 Specifications
General
Brand
JBL
Model
CSMA 280
Category
Music Mixer
Language
English
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