KEF PSW 2000 - Block Diagram

POWERED SUBWOOFER
14
BLOCK DIAGRAM
RCA
L IN
CURRENT AMPLIFIER
L/F-
POWER SUPPLY
HIZ
AC/DC
L/F+
LOZ IN
PRE-AMP
LOZ
INPUT
U1A
AMP DRIVER
AUTO ON/OFF
Q14,Q15
Q16,Q17,Q18,Q19
OVER CURRENT/
OUT
RCA
R/F IN
R/F-
HIZ
R/F+
LOZ IN
PRE-AMP
LOZ
INPUT
U1B
T1,D11
+
U3A,U4A
VR1A
20KBx2
-
AUTO ON/OFF
BUFFER
U2A
VR2 20KA
LEVEL
RCA
L OUT
HIZ
L/F- L/F+
LOZ OUT
LOZ
OUTPUT
RCA
R/F OUT
HIZ
R/F- R/F+
LOZ OUT
LOZ
OUTPUT
U8B
SW1A
SW-2P2T
AGC
U9,U10,U11
U13
ADJUSTABLE
FILTER
U3B,U4B
VR1B 20KBx2
AUTO ON/OFF
BUFFER
U2B
LED1 2LED
PROTECT
PLY1
MUTING
AUTO
MANLIAL
GREEN/ON RED/OFF
SELECT SW-2P1T
+Vcc -Vcc0V
REGULATOR
U12,U13
(115V/230V)
+15V -15V
INPUT
CROSSOVER FREQUENCY (50Hz-130Hz) (50Hz-130Hz)
IEC1 IEC SOCKET
LN
E
AC 115V/230V
SW3
!!
OFF SET PROTECT
HIGHT PASS FILTER
U6
NOTCH DEPTH
U7
PHASE ADJUST
U8A
VR3
20KBx1
(0-180)