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LMS-A6
LMS-A6 user manual
Page 5
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 crossoversActive crossovers versus passive crossovers
Active 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.
FEATURES
• Maximum sonic performance:
Maximum sonic performance:Maximum sonic performance:
Maximum sonic performance: advanced circuit design for exceptional dynamic range and
sonic quality.
• Interchangeable frequency programming cards:
Interchangeable frequency programming cards: Interchangeable frequency programming cards:
Interchangeable frequency programming cards: set the required crossover frequency and
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 outputA flexible 2 input, 6 output
A flexible 2 input, 6 output multi-mode format featuring a choice of stereo 3-way, stereo 2-
way, mono 4-way plus mono 2-way crossover modes with limiters.
• High performance limiters
High performance limitersHigh performance limiters
High performance limiters are provided, one for each output band. Limiter threshold is set by
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: Electronically balanced inputs and outputs:
Electronically balanced inputs and outputs: ensures a high level of rejection for common
mode rejection signals and gives a professional connection to external equipment.