Loudspeaker Processor Configuration - Lab.gruppen PLM series Operation Manual

8. Signal Flow and Processing
The sophisticated output section monitors faults and generates warnings when appropriate; warnings
are displayed on the front panel of the PLM and also sent as messages over the control network. These
indications allow the operator to adjust system settings if necessary. In the rare event that maximum ratings
are grossly exceeded, the PLM will shut down until the condition has been rectified or the incorrect setting
has been readjusted. Sensing circuits also transmit local output power stage temperature, processor card
temperature, and PSU temperature to the appropriate protection circuits. Refer to section 7.3 – Amplifier and
Load Protection Systems for more details.
Table 8.1 lists PLM Series analog input sensitivity in dBu and Vrms for various Amp Gain settings and
maximum/minimum ISVPL settings. Analog input headroom is set at 26 dBu (see section 9.12.3.1).
ISVPL SETTING
GAIN SETTING (dB)
+44
+41
+38
+35
+32
+29
+26
+22
Table 8.1: Analog input sensitivity in dBu and Vrms

8.2 Loudspeaker Processor Configuration

The PLM includes a dedicated Lake Processing system configured with two inputs and six outputs. 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 can be defined
by the user via the Lake Processing software package. The simplest configuration (the default) is that each
input feeds its own Module, including a 2-Aux output configuration.
Figure 8.2a: Lake Processing screenshot showing
module and signal flow of a 2-way crossover
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PLM Series Operation Manual rev 1.1.3
INPUT SENSITIVITY
193 V 153 V
dBu Vrms dBu
+0.9 0.86 -1.1 0.68
+3.9 1.22 +1.9 0.96
+6.9 1.72 +4.9 1.36
+9.9 2.43 +7.9 1.92
+12.9 3.43 +10.9 2.71
+15.9 4.84 +13.9 3.84
+18.9 6.84 +16.9 5.42
+22.9 10.84 +20.9 8.59
17.8 V
Vrms dBu Vrms
-19.8 0,08
-16.8 0.11
-13.8 0.16
-10.8 0.22
-7.8 0.32
-4.8 0.45
-1.8 0.63
+2.2 1.00
Figure 8.2b: Module screenshot showing signal flow
of a 3-way crossover plus 1 aux.