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48
BLOCK DIAGRAM
+
–
+
–
CH.1 100
VDC
+
–
CH.1 115
VDC
+
–
CH.2 115
VDC
TO
R
OID
AL P
OWER
TRANSFORMER
LAMP
FUSE
MA
CKIE DESIGNS
M•2600
BL
OCK DIA
GRAM
9/21/1998
LOW CUT
FIL
TER
CR
OSSOVER
INVER
TER
(FOR BRIDGED MONO
OPERA
TION)
FREQ
CH.1 GAIN
CH.2 GAIN
60-90-120Hz
THR
U–L
OW–HIGH
LIMIT–OFF
-L
OW OUT
P
OWER
SWIT
CH
IN-R
USH
LIMIT
30 VDC
+15 VDC
-15 VDC
22 V
A
C
+
–
CH.2 100
VDC
TRANSFORMER
THERMAL
LINE INPUT
(1/4" TR
S)
LINE INPUT
(XLR
-FEMALE)
THR
U OUTPUT
(XLR
-MALE)
S
TEREO-MONO-BRIDGED
S
TEREO-MONO-BRIDGED
S
TEREO-MONO-BRIDGED
LIMITER
CONTR
OL
CH–1
CH–2
LO
W
HIGH
LOW CUT
FIL
TER
CR
OSSOVER
FREQ
SHOR
T 2
IN-R
USH CONTR
OL
THR
U–L
OW–HIGH
LIMIT–OFF
-L
OW OUT
LIMIT–OFF
-L
OW OUT
LINE INPUT
(1/4" TR
S)
LINE INPUT
(XLR
-FEMALE)
THR
U OUTPUT
(XLR
-MALE)
60-90-120Hz
LO
W
HIGH
SHOR
T 1
(THE SHOR
T LEDS ARE
JOINED IN BRIDGED MODE)
LIMITER
CH
ANNEL 1
P
OWER
AMPLIFIER
FUSE
OUTPUT
RELA
Y
–100VDC
–115VDC
22V
A
C
FUSE
+100VDC
+15VDC
+15VDC
+115VDC
METER
DRIVE
OL
–3
–6
–9
–20
SIG
PR
O
TECT
SHOR
T
SHOR
T 1
CH 1
SIG
CH 1
SIG
CH 2
SIG
CH. 1
SPEAKER
OUT
CH. 2
SPEAKER
OUT
CH. 1
SPEAK
ON
CH. 2
SPEAK
ON
BRIDGED
MONO
SPEAK
ON
PR
O
TECTION CIR
CUITR
Y
MUTE
DC OFFSET
PR
O
TECT
SHOR
T
OUTPUT S
TA
GE CURRENT
OUTPUT S
TA
GE
VO
LT
A
G
E
TRANSIENT SO
A FL
T
S
TEAD
Y S
TA
TE SO
A FL
T
OUTPUT DISSIP
A
TION
LOW V
O
LT
A
GE
DETECT
IN-R
USH CONTR
OL
CH.1 DISSIP
A
TION
MUTE
LIMITER
CH
ANNEL 2
P
OWER
AMPLIFIER
FUSE
OUTPUT
RELA
Y
–100VDC
–115VDC
22V
A
C
FUSE
+100VDC
+15VDC
+15VDC
+115VDC
METER
DRIVE
OL –3 –6 –9 –20 SIG
PR
O
TECT
SHOR
T
CH 2
SIG
PR
O
TECTION CIR
CUITR
Y
MUTE
DC OFFSET
PR
O
TECT
SHOR
T
OUTPUT S
TA
GE CURRENT
OUTPUT S
TA
GE
VO
LT
A
G
E
TRANSIENT SO
A FL
T
S
TEAD
Y S
TA
TE SO
A FL
T
OUTPUT DISSIP
A
TION
LOW V
O
LT
A
GE
DETECT
IN-R
USH CONTR
OL
CH.2 DISSIP
A
TION
MUTE
+30VDC
-30VDC
HO
T LED
COLD LED
CH.1 MUTE
CH.2 MUTE
80
0
C MUTE
52
0
C UN-MUTE
80
0
C MUTE
52
0
C UN-MUTE
CH 1
TEMP
SENSOR
CH 2
TEMP
SENSOR
OVER TEMPERA
TURE
DETECT
OR
TRANSFORMER
THERMAL SWIT
CH
VARIABLE SPEED F
AN CONTR
OLLER
45
0
C – 65
0
C SPEED CONTR
OL CH.1
45
0
C – 65
0
C SPEED CONTR
OL CH.2
FAN IDLE/V
ARIABLE CH.1 P
OWER DETECT
OR
FAN IDLE/V
ARIABLE CH.2 P
OWER DETECT
OR
CH.1 DISSIP
A
TION
CH.2 DISSIP
A
TION
FA
N
Σ
1-
1+
1-
1+
-
+
-
+
1-
1+
SHOR
T 2
(THE CH
ANNELS ARE
SUMMED IN MONO OR BRIDGED MODE)