Turbosound LMS-A6 User Manual

LMS-A6

LOUDSPEAKER

MANAGEMENT SYSTEM

USER’S MANUAL

Turbosound Ltd.

Star Road, Partridge Green

West Sussex RH13 8RY England

Tel: [phone] Fax: [phone]

web: www.turbosound.com

user manual

LMS-A6

CONTENTS

Important Safety Information................................................................................................................. 3

Thanks...................................................................................................................................................... 4

Unpacking the LMS-A6 ........................................................................................................................... 4

Introduction ............................................................................................................................................. 5

Features ................................................................................................................................................... 5

Front Panel Functions ............................................................................................................................. 6

Rear Panel Functions............................................................................................................................... 7

Setting up and operating the LMS-A6.................................................................................................... 8

Internal factory set parameters.......................................................................................................... 8

Crossover frequencies and slopes..................................................................................................... 8

Band Gain............................................................................................................................................ 8

Equalisation......................................................................................................................................... 8

Mains Supply Voltage......................................................................................................................... 8

Connecting inputs and outputs .......................................................................................................... 9

The Power Supply section ...................................................................................................................... 9

Power On Standby Mode.................................................................................................................. 10

Remote standby..................................................................................................................................... 10

Connecting Remote Standby............................................................................................................ 10

Remote Standby Cancel.................................................................................................................... 10

Mono Band 1 ..................................................................................................................................... 10

Level Trims ........................................................................................................................................ 11

Phase Adjustment ............................................................................................................................. 11

Limiter setting and operation............................................................................................................... 11

Limiter Threshold setting ................................................................................................................. 11

Limiter Cancel.................................................................................................................................... 12

Output Level and Limiter Meter ....................................................................................................... 12

Band Mutes........................................................................................................................................ 12

Technical specifications........................................................................................................................ 13

Warranty ................................................................................................................................................ 14

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An example of this equipment has been tested and found to comply with the
following European and international Standards for Electromagnetic
Compatibility and Electrical Safety:

Radiated Emissions (EU): EN55013-1 (1996)
RF Immunity (EU): EN55103-2 (1996) RF Immunity, ESD,

Burst Transient, Surge, Dips &Dwels

Electrical Safety (EU): EN60065 (1993)

IMPORTANT SAFETY INFORMATION

Do not remove Covers. There are no user serviceable parts inside, please refer servicing to
qualified service personnel. This equipment must be earthed.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

DO NOT EXPOSE TO RAIN OR MOISTURE

user manual

LMS-A6

ATTENTION

RISQUE DE CHOC ELECTRIQUE

NE PAS ENLEVER

NE PAS EXPOSER A LA PLUIE NI A L’HUMITE

It should not be necessary to remove any protective earth or signal cable shield connections.

Do not defeat the purpose of the polarized or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding type plug has two blades and a third grounding
prong. The wider blade and the third prong are provided for your safety. When the provided plug
does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

Only use this equipment with an appropriate mains cord.

In the USA the cord should comply with the requirements contained in the Standard for Cord Sets
and Power Supply Cords, UL 817, be marked VW-1, and have an ampacity rating not less than the
marked rating of the apparatus.

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user manual

LMS-A6

THANKS

Thank you for choosing the TURBOSOUND LMS-A6 for your application. Please spare a little time
to digest the contents of this manual, so that you obtain the best possible performance from this
unit.

All TURBOSOUND products are carefully engineered for world class performance and reliability.

If you would like further information about this or any other TURBOSOUND product, please
contact us.

We look forward to helping you in the near future.

UNPACKING THE LMS-A6

After unpacking the unit please check carefully for damage. If damage is found, please notify the
carrier concerned at once. You, the consignee, must instigate any claim. Please retain all
packaging in case of future re-shipment.

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INTRODUCTION

The LMS-A6 is a versatile two input, six output, analogue loudspeaker management system in a
1U rack mount package that is designed for maximum sonic performance. It combines crossover
and limiter functions and is uniquely configurable to custom requirements.

The LMS-A6 can be configured for the following modes of operation: stereo 3-way, stereo 2-way,
mono 4-way, plus mono 2-way. The standard filter provided for the LMS-A6 is a Linkwitz Riley
response based on two second order Butterworth circuits in series. The response is 24dB/octave
slope with a corner frequency where the output of the filter is 6dB down from its pass band level.
The use of these filter realisations has been well documented and provides the best possible
phase and amplitude response for driving loudspeaker systems.

Active crossovers versus passive crossovers

Active crossovers versus passive crossovers

Active crossovers versus passive crossoversActive crossovers versus passive crossovers

Passive crossovers divide the frequency spectrum after the signal has been raised to high power
levels. They are generally bulky, heavy and inefficient. Active crossovers utilise IC’s and
transistors, and divide the frequency spectrum at line level immediately ahead of the amplifiers.
An active crossover does the same job as a passive crossover, but with more precision, flexibility,
efficiency and quality. Crossover frequencies can be readily altered to suit different driver
combinations, the level balance between two or three frequency bands can easily be trimmed, and
line driving, system muting, signal summing, driver equalisation and phase adjustment facilities
can all be incorporated into active crossovers.

user manual

LMS-A6

FEATURES

• Maximum sonic performance:

Maximum sonic performance: advanced circuit design for exceptional dynamic range and

Maximum sonic performance:Maximum sonic performance:
sonic quality.

• Interchangeable frequency programming cards:

Interchangeable frequency programming cards: set the required crossover frequency and

Interchangeable frequency programming cards: Interchangeable frequency programming cards:
slope of your loudspeaker system. These are supplied when the unit is shipped from the
factory.

• A flexible 2 input, 6 output

A flexible 2 input, 6 output multi-mode format featuring a choice of stereo 3-way, stereo 2-

A flexible 2 input, 6 outputA flexible 2 input, 6 output
way, mono 4-way plus mono 2-way crossover modes with limiters.

• High performance limiters

High performance limiters are provided, one for each output band. Limiter threshold is set by

High performance limitersHigh performance limiters
means of 10-position switches located behind a security panel on the rear of the unit.

• Electronically balanced inputs and outputs:

Electronically balanced inputs and outputs: ensures a high level of rejection for common

Electronically balanced inputs and outputs: Electronically balanced inputs and outputs:
mode rejection signals and gives a professional connection to external equipment.

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