Meyer Sound LD-1A Operating Instructions Manual

Operating Instructions

LD-1A

Line Driver

Patents Pending

LD-1A Line Driver

+

15V

-

Power

LD-1A Front Panel

PUSH

Input

PUSH

Mid-Hi Out

LD-1A Rear Panel

CH 1

Mute

Master

0

-3

+3

-6

DS-2

-9
+6

-12

Lo Cut

Array

EQ

Mute

Sub

Mid-Hi

0

-3

+3

-6

-9
+6

-12

Channel 1

DS-2 Out Sub Out Loop

Channel 2

Signal Mute-ClipSignal Mute-Clip

DS-2

φ

Master

Mute

0

-3

+3

-6

-9
+6

-12

DS-2
& Sub
Crossover

Sub

φ

Mute

Mid-Hi

0

-3

+3

-6

-9
+6

-12

CH 2

Mute Mute Mute

0

-3

+3

-6

DS-2

-9
+6

-12

-3

-6

-9

-12

Lo Cut

Array

EQ

Mute

Sub

0

-3

-3

+3

-6

-6

-9

-9
+6

-12

-12

Signal Mute-Clip

φ

DS-2

Master

-6

Mute

0

+3

+6

DS-2
& Sub
Crossover

Sub

φ

Mute

0

+3

+6

PUSH

Input Output

PUSH

-3

-9

-12

CH 3

0

+3

+6

Lo Cut

Array

EQ

Channel 3

Channel 4

CH 4

Signal Mute-Clip

Master

0

-3

-6

-9

-12

Lo Cut

Array

+3

+6

EQ

PUSH

Input Output

PUSH

Mute

Active Mute

φ

Polarity

0

Crossover

Sub DS-2 & Sub

Lo Cut

Out In

Array EQ

Out In

Channel 5

Channel 6

CH 5

Signal Mute-Clip

Master

0

-3

-6

-9

-12

180

CH 6

Signal Mute-Clip

Mute Mute Mute

Master

0

-3

+3

-6

-9

+6

-12

Lo Cut

Array

EQ

Channel 7

PUSH

Input Output

PUSH

Channel 8

Lo Cut

Array

+3

+6

EQ

CH 7

Signal Mute-Clip

Master

-3

-6

-9

-12

CAUTION:

T250mA - 250V FUSE

90-125/180-250 V
50-60 Hz 25W MAX

0

CH 8

Signal Mute-Clip

Master

-3

+3

-6

-9

+6

-12

Lo Cut

Array

EQ

CAUTION:

Set voltage before
applying power.

AC Voltage Ranges

RISK OF FIRE REPLACE WITH

~

0

Mute

Lo Cut

Array

+3

+6

EQ

180-250V

90-125V~

~

Copyright © 1997

Meyer Sound Laboratories, Inc.

All rights reserved

Part #: 05.037.002.01 Rev B2

Symbols Used

UU

LL

CC

UU

LL

®®

LISTED

3K59

COMMERCIAL

AUDIO SYSTEM

These symbols indicate important safety or operating features in this booklet and on the chassis.

!

Dangerous voltages:
risk of electric shock

Pour indiquer les risques

rÈsultant de tensions

dangereuses

Zu die gefahren von

gef‰hrliche spanning zeigen

Para indicar azares provengo

de peligroso voltajes

Important operating

instructions

Pour indequer important

instructions

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Para indicar importante

funcionar y mantenimiento

instrucciones

Declaration of Conformity

According to ISO/IEC Guide and EN 45014

Name: Meyer Sound Laboratories
Address: 2832 San Pablo Avenue

Berkeley, California 94702-2204, USA

conforms to the following Product Specifications:

Frame or chassis

Masse, ch‚ssis

Rahmen oder chassis

Armadura o chassis Tierra proteccionista

Protective earth ground

Terre de protection

Die schutzerde

declares that the product:The Manufacturer:

Product Name: LD-1A
Product Options: All

Safety: EN 60065: 1994
EMC: EN 55022: 1987 - Class A

IEC 801-2: 1984 - 8 kV
IEC 801-3: 1984 - 3 V/m
IEC 801-4: 1984 - 0.5 kV Signal Lines,

The product herewith complies with the requirements
of the Low Voltage Directive 73/23/EEC and the
EMC Directive 89/336/EEC.

1.0 kV Power Lines

Office of Quality Manager

Berkeley, California USA

April 1, 1997

Made by Meyer Sound Laboratories
Berkeley, California USA

European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany

Contact Information

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue
Berkeley, California 94702
Telephone: 510 - 486 - 1166
FAX: 510 - 486 - 8356
E-mail: [e-mail]
www.meyersound.com

Environmental Specifications for

Meyer Sound Electronics Products

Operating temperature: 0 C to +45 C
Non-operating temp: < ñ40 C or > +75 C
Humidity: to 95% at 35 C
Operating altitude: to 4600 m (15,000 ft)
Non-operating altitude: to 6300 m (25,000 ft)

Shock: 30 g 11 msec half-sine

on each of 6 sides

Vibration: 10 ñ 55 Hz (0.010 m

peak-to-peak excursion)

Meyer Sound Germany GmbH

Carl Zeiss Strasse 13
D-56751 Polch, Germany
Telephone: [phone]
FAX: [phone]
Email: [e-mail]

2

Contents

LD-1A Signal Flow Diagram................................ 3

Introduction......................................................... 4

Audio Input ......................................................... 4

AC Power ............................................................. 4

Main Channels 1 and 2 ........................................ 5

LD-1A Signal Flow Diagram

SIGNAL

& CLIP

DETECTOR

Common mode:

Input
10 kW

425 kHz low-pass

Normal mode:
142 kHz low-pass

XLR

3

2

1

fc

RF & ESD
FILTER

80 dB CMRR
Laser Trimmed

DIFF

AMP

Master
Level

-12 to +6 dB

Auxiliary Channels 3-8 ............................................ 6

Example Configurations .. ........................................7

Safety Summary ..................................................... 9

Specifications .......................................................10

GRN
RED

LED

MUTE SWITCHES

Master Mute
Switch

Earth and Chassis GND

power supply board

Full range

Low-cut

160Hz

Q=0.8

-12 dB/oct

Channels 1& 2 only

80Hz
Elliptical

65Hz
Q=0.9

-12 dB/oct

10 W on

Full range

Crossover

DS-2 & Sub
Crossover

Full range

Crossover

Audio GND

Ð6 dB at
220Hz;

0.6 octave
bandwidth

ArrayEQ

DS-2
Level

-12 to +6 dB

Sub
Level

-12 to +6 dB

Flat

DS-2 Mute
Switch

Sub Mute
Switch

Channels 1& 2

Mid-Hi
Level

-12 to +6 dB

only

Mid-Hi Mute
Switch

Polarity
normal

Polarity
inverted

Polarity
normal

Polarity
inverted

High Current

DIFFERENTIAL

DRIVER

High Current

DIFFERENTIAL

DRIVER

High Current

DIFFERENTIAL

DRIVER

PWR-ON

PWR-OFF

MUTE

PWR-ON

PWR-OFF

MUTE

PWR-ON

PWR-OFF

MUTE

XLR

RF

BLOCK

Earth and Chassis GND

RF

BLOCK

Earth and Chassis GND

RF

BLOCK

Earth and Chassis GND

XLR

XLR

3

2

1

3

2

1

3

2

1

DS-2 or
2nd Sub
Output

Sub
Output

Mid-Hi
Output

3