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Signal Flow and Lake Processing

PLM Series Quick Start and Field Reference Guide Rev 1.3.5

5.4 Loudspeaker Processor Overview

The Lake Processing system within PLM Series devices may be congured with up to two processing

Modules containing a total of up to six processing Module outputs, although the number of power outputs

will be either two or four depending on the PLM model being used. To make use of the extra processing

channels, multiple hardware devices may be connected together using the Super Module feature as sum-

marized in section 5.3.3.

Each set of processing elements is referred to as a Module and can be congured as crossovers, full-

bandwidth auxiliary outputs, or a combination of the two. The relationship between inputs and outputs is

dened via the Lake Controller or via the front panel Input Cong Menu.

The Lake Processing system provides two distinct categories of crossovers:

▸ Innite Impulse Response lters (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.

▸ Finite Impulse Response lters (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 crossovers and module types is available in the Lake Controller Operation Manual.

5.5 Files and Presets

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

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

5.5.1 Module, System and Sub-System Conguration Files

Module, System and Sub-System Conguration les are stored on the Lake Controller PC, and data is

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

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

delay, and limiter information for an individual loudspeaker (i.e. the data shown in red in the signal ow

diagrams in section 5.1). A Module le 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 Conguration File contains a set of Module le information in addition to

Frame related information such Group data and I/O conguration (i.e. the data shown in blue in the

signal ow diagrams in section 5.1).

5.5.2 Frame and System Presets

The entire processor conguration can be stored as a Frame Preset on this hardware device. Presets can

be recalled via the front panel (refer to section 6.10.6) or via the Lake Controller software or Preset Manager

utility; presets can be stored using the Lake Controller software or Preset Manager utility.

Lab.gruppen PLM Series Quick Start Guide

Other manuals for Lab.gruppen PLM Series