Module Submenu; Gain; Delay; Phase Reverse - Lab.gruppen PLM Series Operation Manual

9 FRONT PANEL INTERFACE

9.13.2 Module submenu

This submenu is selected by pressing soft button 2,
named Module from the menu top page.
Menu
Module

Gain

Delay

Polarity
Figure 9.13.2: Module menu view
The options available are as follows:
9.13.2.1 Gain
This option is selected by pressing soft button 2
(Gain) from Menu è Module.
This allows the Module gain to be adjusted at two
different places. Soft function buttons 2 and 3 select
Module A or Module B inputs respectively for gain
adjustment. Soft function buttons 5-8 select Module
outputs 1-4 for gain adjustment. Gain may be adjusted
in 0.1 dB increments from -100 dB to +20 dB, which
is the default gain setting unless another range has
been specified in the Module settings. The Module
gain parameters may also be adjusted from the DLC
PLM Edition software.
The Group Sum value is also displayed (in brackets)
for this parameter for each channel.
9.13.2.2 Delay
This option is selected by pressing soft button 3
(Delay) from Menu è Module.
The audio signal may be delayed (typically for reasons
of driver or delay subsystem alignment) at either the
PLM Module inputs or on individual outputs. Delay
added at the inputs will, of course, affect all outputs
equally, and will be generally be introduced to time-
align arrays of loudspeakers at different locations.
Delaying individual outputs may be desirable to
time-align drivers in the same cabinet or array.
38 PLM Series Operation Manual

Amp Gain

Limiters

Mute
Delay is adjustable in increments of 0.1 mS. Maximum
input delay is 1.8 S, and maximum output delay is 100
mS which is the default delay setting unless another
range has been specified in the Module settings. The
Module delay parameters may also be adjusted from
the Dolby Lake Controller PLM Edition Software.
The Group Sum value is also displayed (in brackets)
for this parameter for each channel.

9.13.2.3 Phase reverse

This option is selected by pressing soft button 4
(Polarity) from Menu è Module.
Audio phase reversal is available at the inputs to
Module A and Module B, and also individually on the
four output channels. The on-screen text displays
"Positive" for normal operation, and "Negative"
when a signal is phase inverted. The input or output
may be selected with the adjacent soft button and
the polarity changed with the rotary encoder. The
Module phase reverse settings may also be adjusted
from the DLC PLM Edition software.
9.13.2.4 Amp Gain
This option is selected by pressing soft button 5
(Amp Gain) from Menu è Module.
This adjusts the gain of the PLM's power output stage
for each output channel. The default gain setting is
35 dB, but this is variable in 0.1 dB increments from
22 dB to 44 dB. Care should be taken in altering
Amp Gain, which should be adjusted in conjunction
with the Gain controls and limiter thresholds (see
section 9.12.2.1).
9.13.2.5 Limiters
This option is selected by pressing soft button 6
(Limiters) from Menu è Module.
Various parameters of the PLM's Inter-Sample
Voltage Peak Limiter (ISVPL) and the Dolby Lake
processing system's LimiterMax can be adjusted in
this submenu. By default, simultaneous adjustment
of most limiter parameters in all four output channels
is selected, though channels may be adjusted
individually if desired. Attack and Release times must
be adjusted individually per channel