Lab.gruppen PLM Series PLM 10000Q User Manual - 5 Operation
14 Dolby Lake Controller User Manual PLM Edition Addendum
5.3.4 amplifier Clip Level
From the Amplifier Gain and ISVPL values, the
Amplifier Clip level is calculated, and displayed in
the third row of the table for each channel. This figure
represents the digital signal level from the Module
output which will produce clipping or limiting at the
power output channel. If no EQ or additional gain is
applied in the Dolby Lake processing Module, than
this figure also represents the digital input level at
which clipping or limiting will be produced at the
power output channel.
The ‘ALL’ column only shows a value in any
of the rows if the values for the parameter
are identical for all the PLM module output
channels being displayed. The number of
channels displayed depends on the current crossover
configuration.
5.3.5 amplifier Gain and isVpL Level Limits
Designer Mode allows a system designer to set level
limits for Amplifier Gain and ISVPL, and hide these
parameters. This function is accessed from a button
(visible only in Designer Mode) in the lower right
corner of the tab window. The button opens a new
window where minimum and maximum levels may
be set. These limits are stored as factory levels when
a base configuration file is saved. Users loading a
module employing this base configuration can only
adjust these parameters within the specified range.
If the maximum and minimum values are identical,
the value is fixed and it is hidden from view. For more
information on Designer Mode, please refer to the
DLC User manual.
5.4 Load Tab
The Load page is selected by tapping the Load tab in
Module View. LoadSmart loudspeaker verification is
initiated from this tab. LoadSmart generates a test
signal which is applied to the power output stage.
Measurements are taken at the power output stage,
and the results computed for the speaker type, using
data from the LoadLibrary.
The Load tab is disabled if no Fingerprint
data is loaded and when the PLM is in
Standby mode.
The Load tab allows the user to edit the default
cable data in the Fingerprint, including data such as
the physical characteristics of the cable, to permit
calculation of the total cable resistance to each
loudspeaker. The Dolby Lake Controller PLM Edition
application then combines this data with the known
loudspeaker characteristics (Fingerprint) to more
accurately verify the load and to confirm correct
loudspeaker system operation.
5.4.1 Number of cabinets
The number of loudspeaker cabinets connected in
parallel to each channel is entered in the No. of Cabinets
in Parallel field. LoadSmart uses this configured
number as a basis for verification and issuing a pass/
fail verdict. This data may also be entered via the
PLM’s front panel. See the PLM Series Operation
Manual, section 9.12.7.1 for more information.
5.4.2 Cable resistance
The Cable Resistance filed presents the total cable
resistance that is configured for each power output
channel. The Fingerprint contains a default cable type
that is loaded with it. Tapping the Cable Resistance
field opens the Cable Resistance Calculator where
the individual cable parameters can be viewed and
edited. Changes in the Cable Resistance Calculator are
automatically mirrored back to the Cable Resistance
field.
5.4.2.1 Calculator
A Cable Resistance Calculator provides input fields
for cable length, cable gauge, contact resistance
and cable resistivity. The entered data fields give
a calculated result for the total loudspeaker cable
resistance in ohms. This figure is is automatically
loaded into the Total Cable Resistance field for