Meyer Sound LD-1A User Manual

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

Meyer Sound LD-1A Specifications

Audio Inputs

input impedance	10 k differential
common mode rejection ratio	> 80 dB
rf filter common mode frequency	425 kHz low-pass

Audio Outputs

output impedance	50 Ohm balanced
maximum voltage with 600 Ohm load	±22.5 Vpk
maximum current	±70 mApk

AC Power

operating voltage	90 - 125 VAC / 180 - 250 VAC
maximum power	25 Watts
fuse	5 x 20 mm, T 250 mA, 250 V, time-lag

Audio Performance

frequency response	< ±0.2 dB 20 Hz - 20 kHz
dynamic range	> 120 dB
noise floor	> -95 dBV A-weighted

Physical

height	3.45 inches
width	16.75 inches
weight	13.5 lb