User guide

30
Signal Flow and Lake® Processing
PLM Series Operation Manual rev 1.2.3
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 these types of crossovers and information on conguring various module types can be
found in the Lake Controller Operation Manual.
6.5 Files and Presets
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.
6.5.1 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. 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 as I/O routing, along with Group control information.
6.5.2 Frame and System Presets
This device allows the complete processor conguration to be stored as a Frame Preset on the hardware
unit itself. Presets can be recalled via the front panel (please refer to section 7.11.7) or via the Lake Controller
software (please refer to the Lake Controller Operation Manual).
A maximum of 100 Frame Presets can be stored on this device. The data within a Frame Preset includes the
congurations of both Modules in the Frame, including all levels, crossover, EQ, input mixer, output routing,
and all other Module, Frame and Group parameters. As Frame Presets are stored in the device, complete
processor congurations may be recalled without the need to connect the device to a PC.
Using the System Presets function in the Lake Controller, entire system congurations can be stored and
recalled across a network of LM 26, PLM, Mesa Quad EQ, Contour Pro 26, and Dolby Lake Processors. This
enables fast retrieval and switching of entire system congurations as minimal data is being sent between
the Controller and Processors.