Manual

6. Signal Flow and Lake® Processing
PLM+ SERIES Operation Manual rev 1.0.0
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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 conguration of that Frame.
Each Module can be congured as a Classic Crossover (Bessel, Butterworth, Linkwitz-Riley), as a Linear Phase
Crossover, or as multiple full bandwidth Auxiliary Outputs. The default conguration 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 les), the Lake Controller also includes a set of enhanced
Module les specically for use with the PLM and PLM+ Series.
These supplementary PLM+ Module les, known as the LoadLibrary, incorporate both Lake DSP parameters along
with PLM+ specic data; LoadLibrary Module les include parameter settings for the Amplier 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 verication (LoadSmart) to be performed on the PLM+.
This data set is termed a Fingerprint. When a PLM+-specic loudspeaker type is loaded, its Fingerprint load
characteristics are included. These load characteristics are stored in a le with a “.mdl” sufx and are loaded
simultaneously with the module le.
6.5. Loudspeaker Processor Overview
The Lake Processing system within PLM+ Series devices may be congured 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 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.
Notes