Operation Manual

6. Signal Flow and Lake® Processing
PLM+ SERIES Operation Manual rev 3.0.4
31
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.
6.6. 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.
6.6.1. Module, System and Sub-System Configuration 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 (see Figure 6.1).
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 (see Figure 6.1).
6.6.2. 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 7.11.7) or via the Lake Controller software or Preset Manager utility;
presets can be stored using the Lake Controller software or Preset Manager utility.
A maximum of 100 Frame Presets can be stored on this device. The data within a Frame Preset includes the
congurations of all Modules in the Frame, including levels, crossover, EQ, input mixer, routing, and all other
parameters. As Frame Presets are stored in the hardware device, recall is available without using 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, PLM and PLM+ Series devices. This enables fast retrieval and switching of entire system
congurations as minimal data is being sent between the Controller and Processors.
7. Front Panel Interface
32
PLM+ SERIES Operation Manual rev 3.0.4
7. Front Panel Interface
An overview of the front panel interface is provided in section 4.1. This chapter describes each cluster of controls
as shown in the diagram below.
3
1 2 4
5
6
7 8 9 12
11
10 2 1
7.1. Overview
The front panel interface is framed by two sturdy cast aluminium handles
1
and metal grill protecting the air intake
and dust lters
2
. The majority of PLM+ functions can be controlled and/or monitored via the frontpanel LCD
display screen
3
, power button
4
, function buttons
5 6 7
12
8 9
and rotary encoder
11
.
7.1.1. Operating Modes
The front panel has two basic modes: Meter Mode and Menu Mode.
• Meter Mode provides the following views: Home view, Amplier Meters view / LoadPilot view, Temperature
Meters view, Input Meters view and Module Meters view. To navigate through these views, press the METER
button or turn the rotary encoder button. Please refer to section 7.10 for further information on Meter Mode.
• Menu Mode provides various menus for viewing and editing parameters and is selected by pressing the MENU
button. Select the required submenu by pressing the associated button.
7.1.2. Warning, Fault and Mute Indications
Fault or warning conditions are indicated via the LEDs embedded in the dynamic function buttons; a simultaneous
description is shown adjacent to the button, on the LCD. The LEDs to the left of the LCD indicate problems with
the PLM+ or its inputs, while those to the right indicate problems with the power output channels.
Please note that the same LEDs also indicate the mute status of inputs (left) and outputs (right). Further information
on faults and warnings can be found in section 9.1.
7. Front Panel Interface
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PLM+ SERIES Operation Manual rev 3.0.4