Signal Flow And Processing 8; Signal Flow; Level Adjustments; Mute Points - Lab.gruppen PLM Series Operation Manual

8.1 signal Flow

Figure 8.1 is a graphic presentation of the signal flow
inside a PLM. As is readily apparent, the PLM is an
unusually sophisticated system comprising many
different subsections of both digital and analog
technologies. To realize the full potential of the PLM,
it is important to understand the possibilities and
limitations within the system, with particular regard to
the multiple points for muting as well as adjustment
of gain or attenuation.

8.1.1 Level adjustments

Because of the full integration of the Dolby Lake
processing, the PLM offers five separate points in
the signal chain where signal level can be adjusted.
It is critical to grasp the significance of the various
level adjustments in order to obtain optimum audio
performance. Numbers refer to points in the signal
flow diagram.
Users may adjust the input levels to, and the output
levels from, the Dolby Lake processing system
(MODULE input 3 and MODULE output 4). The
PLM power stage gain 6 may be adjusted as well. All
three adjustments can be made from either the front
panel display or the DLC PLM Edition software.
Figure 8.1: PLM Signal Flow Diagram (Part 2)
4
Module Output:
Gain/Level
LimiterMax
Phase Rev RMS / Peak
Mute
Module Output:
Gain/Level
LimiterMax
RMS / Peak
Phase Rev
Mute
Module Output:
Gain/Level
LimiterMax
Phase Rev RMS / Peak
Mute
Module Output:
Gain/Level
LimiterMax
Phase Rev
RMS / Peak
Mute

sIGNAL FLOW AND PROCEssING 8

The per-channel attenuation 5 can only be made
from the front panel by selecting MENU > MODULE
> ATTENUATION.
Additionally, the physical inputs 1 to the PLM can be
mixed, with level adjustment, prior to entering the
Dolby Lake module. This adjustment is available only
through the DLC PLM Edition software.

8.1.2 Mute points

Unlike traditional amplifiers, the PLM can be muted
at several points in the audio chain. It is important
to understand the location of these mutes and how
to control them.
8.1.3 Power Output section: Limiting and
The Current Peak Limiter (CPL) dynamically limits the
drive to the power stage based on three parameters:
sensed output current level, feedback from the output
stage, and sensed voltage clip from the ISVPL. This
ensures that power output is maintained within the
design limits of the PLM.
The adjustable Inter-Sample Voltage Peak Limiter
(ISVPL) sets the PLM's maximum output voltage
5
Attenuator
Mute ISVPL
Phase Rev
Attenuator
Mute ISVPL
Phase Rev
Attenuator
Mute ISVPL
Phase Rev
Attenuator
Mute ISVPL
Phase Rev
Important additional information on setting
the gain structure within the PLM can be
found in section 12.3.
sensitivity
6
Amp Gain
SpeakerSafe
Amp Gain
SpeakerSafe
Amp Gain
SpeakerSafe
Amp Gain
SpeakerSafe
PLM Series Operation Manual 23
LoadSmart
AMP
LoadSmart
AMP
LoadSmart
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LoadSmart
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