The Array Compensation section precisely
corrects for the low-mid frequency buildup
typical of all line and curvilinear arrays,
with the proper response characteristic
calculated automatically by selecting the
type of M Series loudspeaker and number
of cabinets in the array. For atmospheric
compensation, the LD-3 provides front-
panel controls for entry of the temperature
(0° to 45° C), relative humidity (10% to 100%)
and a three-way switch for altitude (0 to
800 meters, 800 to 2200 meters and above
2200 meters). A pocket thermohygrometer
is supplied. Correction on all parameters is
accurate to within 1 dB up to 16 kHz.
Each of the two input channels has three
independent full-range output sections
to control branches within the array or
ancillary delay and fill systems, plus a
dedicated subwoofer output. Each output
section includes gain trim, illuminated
Mute switches, Signal/Clip indicators,
The LD-3 compensating line driver is
specifically designed for fast, accurate
optimization of sound reinforcement
systems based on line and curvilinear
arrays of Meyer Sound’s self-powered M
Series. Using an on-board RISC micro-
controller, the LD-3 automatically calculates
optimal system response by taking into
account the M Series loudspeaker type,
array size, required throw distance, and
the atmospheric variables of temperature,
humidity and altitude.
Housed in a 2U rack-mount cabinet, the
LD-3 is a digitally controlled analog system
combining the wide dynamic range of
advanced analog filters with the precise
repeatability and computer connectivity of
digital control, while exhibiting no latency.
The LD-3’s two-channel master input
section provides intuitive, rotary knob
controls for quick entry of key variables.
Specifically designed for fast, accurate
optimization of M Series line or curvilinear
arrays
Robust drive electronics maintain signal
integrity over long cable runs
Atmospheric compensation assures
consistent system performance regardless
of temperature, humidity or altitude
features & benefits
Precise compensation for low-mid buildup
(inherent in all line or curvilinear arrays)
helps ensure ultra-flat frequency response
Premium quality analog filters for wide
dynamic range and no latency
Digital control allows for precise and
repeatable calibration with automatic
calculation of the optimum correction
filter values
LD-3 : Compensating Line Driver
DATASHE E T
Insert switches, and a dedicated Distance
control to optimize response of different
sub-sections within the array for defined
coverage areas up to 150 meters away.
The dedicated subwoofer output section
includes a polarity switch and Low-Pass
Filter along with the gain trim, Signal/Clip
indicator, Insert switch and Mute switches.
The LD-3 provides a complement of three
Sends and four Returns to allow insertion
of external signal processing devices
such as parametric equalizers or digital
delay units. The Send outputs are derived
from three points prior to atmospheric
correction in the signal path: full-range
pre-array compensation, full-range
post-array compensation, and post-array
compensation/post High-Pass Filter. This
provides maximum flexibility in configuring
systems using mixed M Series arrays, or for
employing other non-arrayed Meyer Sound
loudspeakers as delays or fills.
ELECTRO N ICS
Three main outputs for each channel allow
separate atmospheric high-frequency
correction for three branches within the
array
Dedicated subwoofer output section
Insert Sends and Returns on XLR
connectors allow flexible signal routing and
insertion of outboard signal processing
Power
15V
+
-
Temperature
F C
35 2
45 7
55 13
65 18
75 24
85 29
95 35
105 41
115 46
(F-32 )/1.8= C ft(0.3048)=m
Distance
ft m
10 3
70 21
130 40
190 58
250
76
310 94
370 113
430 131
490 149
-6
-3
0
+3
+6
-3
-6
-12
0
+3
+6
Signal Clip
Sub A
Sub
φ
Signal Clip
HPF H z
x-ove r
Low
pass
filte r
LPF H z
160
80
Off
HPF H z
160
80
Off
Master Input A
Sub B
Signal ClipSignal Clip
x-ove r
Low
pass
filte r
LPF H z
+3
-6
-3
0
+6
-3
-6
-12
0
+3
+6
-6
+6
-6
+6
-6
+6
-6
+6
-6
+6
-6
+6
0
50
20
10
30
70
90
11
0
150
Mute
Insert
Signal Clip
Max Correct
Attn dB
Dista nce m
Mute
Insert
Signal Clip
Max Correct
Max Correct
Max Correct
Max Correct
Max Correct
Attn dB
Dista nce m
Mute
Insert
Signal Clip
Attn dB
Dista nce m
Mute
Insert
Signal Clip
Attn dB
Dista nce m
Mute
Insert
Signal Clip
Attn dB
Dista nce m
Mute
Insert
Signal Clip
Attn dB
Dista nce m
-3
0
+3
0
50
20
10
30
70
90
11
0
150
-3
0
+3
0
50
20
10
30
70
90
110
150
-3
0
+3
0
50
20
10
30
70
90
11
0
150
-3
0
+3
0
50
20
10
30
70
90
11
0
150
-3
0
+3
0
50
20
10
30
70
90
11
0
150
-3
0
+3
Channel 3A
Channel 3B
Channel 2A
Channel 2B
Channel 1A
Channel 1B
>800
0
Altitude m
0
10
15
20
25
35
30
40
45
5
10
30
40
15
50
75
100
20
Pro gra m
Loa ded
2
4
6
8
10
12
13
14
16
18
20
22
24
1
M1D
M2D
M3D
MIL
O
Remote
Array Correction
Atmospheric
Correction
LD-3 Line Driver
Enter
Relative Humidity %
Temperature
∞
C
Array Size
Master Input B
Mute
Attn dB
Mute
Attn dB
80
55
Off
80
55
Off
Mute
Insert
Attn dB
Chann el
A1 -A 3
x-ove r
High
pass
filte
r
Chann el
B1 -B 3
x-ove r
High
pass
filte
r
Mute
Insert
Attn dB
Sub φ
>2200
210-250V~
105-125V~
AC Voltage Range
sData
CAUTIONS:
SET VOLTAGE BEFORE APPLYING POWER.
RISK OF FIRE REPLACE
WITH T250mA - 250V FUSE
10 5-125/2 10 -250V~
50 -60 Hz 25W MAX
Insert / Return
Insert / Return
Input / Output
Input / Output
Send
Send
Full Range
Pre-Array
Full Range
Post-Array
Post-Array
Post-HPF
Sub Input
Pre-x-over
CH 2CH 1 CH 3
CH 1 CH 3Sub CH 2
Input
Pre-Atmospheric Correction / Post-HPF
A A
BB
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
(32 pages)
(12 pages)
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