Loudspeaker Crossover Configuration Overview; Files And Presets - Lab.gruppen Lake LM 26 Operation Manual

Digital audio loudspeaker processor

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Signal Flow and Lake Processing

The key benefit of this feature is the ability to connect and control crossovers, levels and EQ across multiple

hardware devices simultaneously from the Lake Controller. For example, one device may be driving sub and

low-frequency speakers, while another device controls mid-range and hi-frequency drivers. Using a single

adjustment the crossover points between the two devices can be changed simultaneously.

Please refer to the Lake Controller Operation Manual for further information regarding Super Modules.

5.4

Loudspeaker Crossover Configuration Overview

The Lake Processing system within LM 26 devices may be configured with up to two inputs and up to

six Module outputs. Each set of processing elements is referred to as a Module and can be configured as

crossovers, full-bandwidth auxiliary outputs, or a combination of the two. The relationship between inputs

and outputs is defined via the Lake Controller or via the front panel I/O CONFIG Menu.

The Lake Processing system provides two distinct categories of crossovers:

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Infinite Impulse Response filters (IIR) such as the classic Bessel, Butterworth or Linkwitz-Riley types;

these are available with slopes ranging from 6 dB/octave to 48 dB/octave.

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Finite Impulse Response filters (FIR) providing zero phase shift with steep transition slopes at the

crossover frequencies. These are also referred to as Linear Phase Crossovers.

Further details on these types of crossovers and information on configuring various module types can be

found in the Lake Controller Operation Manual.

5.5

The Lake system provides various methods for storing and recalling Module, Frame, or system-wide data. A

overview is provided below; for further information please refer to the Lake Controller Operation Manual.

5.5.1

Module, System and Sub-System Configuration Files

Module, System and Sub-System Configuration files are stored on the Lake Controller PC, and data is

passed across the network when recalling or storing these type of files.

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A Module file is the smallest set of data that can be stored and recalled; it contains crossover, gain,

delay, and limiter information for an individual loudspeaker. A Module file may be recalled into other

Lake devices. It is not possible to store a Module File directly on the hardware device.

▸

A System or Sub-System Configuration File contains a set of Module file information in addition to

Frame related information such as I/O routing, along with Group control information.

LM 26 Operation Manual rev 1.1.8

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