Modules And Frames; Loudspeaker Processor Overview - Lab.gruppen PLM 20K44 Operation Manual

6.4. Modules and Frames

6.4.1. Overview
A Frame represents one physical Lake Processor device (e.g. PLM 12K44). A maximum of four Modules are
contained within each Frame; these are referred to as Module A, B, C and D. The number of Modules shown in a
given Frame is dependent upon the signal processing configuration of that Frame.
Each Module can be configured as a Classic Crossover (Bessel, Butterworth, Linkwitz-Riley), as a Linear Phase
Crossover, or as multiple full bandwidth Auxiliary Outputs. The default configuration for the PLM+ is 4 x Contour
Classic 1 Way (CL1-Way) Output Modules, providing a total of twelve Module outputs that can be routed to any of
the four power outputs.
Please refer to the Lake Controller Operation Manual for further information.
6.4.2. LoadLibrary™ and Fingerprints
In addition to the standard loudspeaker presets (Module files), the Lake Controller also includes a set of enhanced
Module files specifically for use with the PLM and PLM+ Series.
These supplementary PLM+ Module files, known as the LoadLibrary, incorporate both Lake DSP parameters along
with PLM+ specific data; LoadLibrary Module files include parameter settings for the Amplifier Gain and ISVPL
limiter. Additionally, LoadLibrary loudspeaker types may also include data relating to the electrical characteristics of
a particular loudspeaker.
Electrical characteristic data is used to enable load verification (LoadSmart) to be performed on the PLM+.
This data set is termed a Fingerprint. When a PLM+-specific loudspeaker type is loaded, its Fingerprint load
characteristics are included. These load characteristics are stored in a file with a ".mdl" suffix and are loaded
simultaneously with the module file.

6.5. Loudspeaker Processor Overview

The Lake Processing system within PLM+ Series devices may be configured with up to four processing Modules
containing a total of up to twelve processing Module outputs, that can be routed to any of the four power output
channels.
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 Input Config Menu.
The Lake Processing system provides two distinct categories of crossovers:
• 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.
• 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.
6. Signal Flow and Lake® Processing
PLM+ SERIES Operation Manual rev 1.0.0
Notes
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