Owner's Manual

3
STEREO ACTIVE SPEAKER CONFIGURATION
*
INPUT Switch set to LINE
MIXER
LS720P
STEREO PASSIVE SPEAKER CONFIGURATION
*
INPUT Switch set to SPKR
PWR
AMP
LS720P #1 LS720P #2
*
INPUT Switch set to LINE
MIXER
STEREO ACTIVE SPEAKER CONFIGURATION
LS720P #1 LS720P #2
BLOCK-DIAG-LS720P-00-1v0.ai
CLIP DETECT
CIRCUIT
REF IN
INPUT
DIFF AMP
INTEGRATED
ERROR AMP
RAMP
GENERATOR
GND AT
OUTPUT
U9. Q8, U10
LEVEL SHIFT
U6
GATE DRIVE
BUFFERS
1
2
3
-120
U7
R47
WOOFER
WOOFER
OUTPUT
TRANSISTORS
OUTPUT
FILTER
MODEL TYPE:YS1055
EQ
LP
HP
EQ
HP
LIMITER
LED
RMS
LIMITER
POWER
SUPPLY
CLASS-D
AMPLIFIER
(WOOFER)
*CLASS-D AMPLIFIER (WOOFER)
*BLOCK DIAGRAM
LOCATED BELOW
NOTE: Shorting R47 will eliminate
feedback and audio signal allowing
troubleshooting of Level Shift, drivers
and output devices
SILENT ON/OFF
VIA Q19
SLOW DETECT
FAST DETECT
LP
LP VARIABLE
LP
LP VARIABLE
LEVEL
1
3
2
1
3
2
1
3
2
2
3
1
LINE / SPKR
Bl oc k Di ag ra m fo r
LS 7 20P
D E S I G N E D & M A N U FA
C T U R E D B Y Y O R K V I L L E S O U N D