Meyer Sound LD-1A User Manual

LD-1A Line Driver
Power
15V
+
-
Mute
CH 1
Sub φ
DS-2
& Sub
Crossover
DS-2 φ
Mute
Mute
Mute
Array
EQ
Lo Cut
CH 2
DS-2
& Sub
Crossover
Mute
Mute Mute Mute
Signal Mute-Clip
CH 5
Mute Mute Mute
Signal Mute-Clip
CH 8
Mute
Signal Mute-Clip
CH 6
Signal Mute-Clip
CH 7
Signal Mute-Clip
CH 4
Signal Mute-Clip
CH 3
Out In
Sub DS-2 & Sub
Active Mute
0 180
Signal Mute-ClipSignal Mute-Clip
Master
φ Polarity
Mute
Crossover
Array EQ
-12
-6
-3
0
+3
+6
-9
DS-2
Mid-Hi
Sub
Out In
Lo Cut
Array
EQ
Lo Cut
Master
Mid-Hi
Array
EQ
Lo Cut
Master
Array
EQ
Lo Cut
Master
Array
EQ
Lo Cut
Master
Array
EQ
Lo Cut
Master
Array
EQ
Lo Cut
Master
Array
EQ
Lo Cut
Master
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
Sub φ
Mute
Sub
-12
-6
-3
0
+3
+6
-9
-12
-6
-3
0
+3
+6
-9
Mute
DS-2
φ
DS-2
-12
-6
-3
0
+3
+6
-9
LD-1A Front Panel
Input
Mid-Hi Out
DS-2 Out Sub Out Loop
Channel 3
Input Output
180-250V ~
90-125V ~
AC Voltage Ranges
CAUTION:
Set voltage before
applying power.
Channel 1
Channel 2
Channel 4
Channel 5
Input Output
Channel 6
Channel 7
Input Output
Channel 8
90-125/180-250 V ~
50-60 Hz 25W MAX
CAUTION: RISK OF FIRE REPLACE WITH
T250mA - 250V FUSE
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
LD-1A Rear Panel
Patents Pending
Operating Instructions
LD-1A
Copyright © 1997
Meyer Sound Laboratories, Inc.
All rights reserved
Part #: 05.037.002.01 Rev B2
Line Driver

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

Summary

Environmental Specifications

LD-1A Signal Flow Diagram

Introduction

Audio Input

Details on the LD-1A's 10 kOhm balanced input impedance and XLR wiring convention for audio sources.

Meyer Speaker Types

Lists Meyer self-powered speakers mentioned in the document, including MSL-4, CQ Series, DS-2P, 650-P, and PSW-2.

AC Power

AC Inlet and Voltage Select Switch

Information on the IEC 320 mains AC inlet and the voltage select switch for 90-125V and 180-250V operation.

AC Fuse

Instructions for replacing the T250mA, 250V time-lag fuse, emphasizing safety precautions.

Main Channels 1 and 2

Mid-Hi Output

DS-2 and Sub Outputs

Auxiliary Channels 3-8

Example Configurations

Speaker Placement and Polarity

Guidance on speaker placement and setting opposite polarities to compensate for propagation delay between speakers.

Measurement and Correction

Recommendations for using SIM System II and CP-10 EQ for system setup, delay, and frequency response correction.

MSL-4 and PSW-2 Configuration

Details on using MSL-4 and PSW-2 for a full-range system, including gain control and frequency response considerations.

MSL-4, DS-2P, and 650-P Configuration

Integrating DS-2P and 650-P with MSL-4 for enhanced LF power and clarity, with specific filter and polarity settings.

PSW-2 Flown with MSL-4; 650-P on the Floor

MSL-4, DS-2P, 650-P with CQ Down-fill

Safety Summary

Specifications