3
LD-1A Signal Flow Diagram ................................ 3
Introduction ......................................................... 4
Audio Input ......................................................... 4
AC Power ............................................................. 4
Main Channels 1 and 2 ........................................ 5
Contents
Auxiliary Channels 3-8 ............................................ 6
Example Configurations .......................................... 7
Safety Summary ..................................................... 9
Specifications ....................................................... 10
XLR
3
2
1
Input
10 kW
RF & ESD
FILTER
Common mode:
425 kHz low-pass
Normal mode:
142 kHz low-pass
fc
DIFF
AMP
10 W on
power supply board
80 dB CMRR
Laser Trimmed
SIGNAL
& CLIP
DETECTOR
Master
Level
-12 to +6 dB
MUTE SWITCHES
Master Mute
Switch
DIFFERENTIAL
DRIVER
PWR-ON
PWR-OFF
MUTE
RF
BLOCK
XLR
3
2
1
Mid-Hi
Output
High Current
Earth and Chassis GND
Earth and Chassis GND
Audio GND
160Hz
Q=0.8
-12 dB/oct
Mid-Hi
Level
-12 to +6 dB
Full range
Low-cut
Flat
ArrayEQ
Ð6 dB at
220Hz;
0.6 octave
bandwidth
Channels 1& 2
only
DIFFERENTIAL
DRIVER
PWR-ON
PWR-OFF
MUTE
RF
BLOCK
XLR
3
2
1
DS-2 or
2nd Sub
Output
DS-2 Mute
Switch
High Current
80Hz
Elliptical
DS-2
Level
-12 to +6 dB
Channels 1& 2 only
Full range
Crossover
Earth and Chassis GND
DIFFERENTIAL
DRIVER
PWR-ON
PWR-OFF
MUTE
RF
BLOCK
XLR
3
2
1
Sub
Output
Sub Mute
Switch
High Current
Earth and Chassis GND
Sub
Level
-12 to +6 dB
Full range
Crossover
Polarity
normal
DS-2 & Sub
Crossover
65Hz
Q=0.9
-12 dB/oct
GRN
RED
LED
Mid-Hi Mute
Switch
Polarity
inverted
Polarity
normal
Polarity
inverted
LD-1A Signal Flow Diagram
