Lab.gruppen PLM Series PLM 10000Q Quick Start Manual - Quick Start Tutorial 6
PLM Series Quick Start and Field Reference Guide
15
setting is derived from the LoadLibrary fingerprint
data within the PLM preset. as such, it should not
need to be adjusted further. (adjust in i/o Config,
module pane.)
Attenuator
one adjustment is provided per output channel in
the PLM. this control replaces the traditional knob
found on conventional amplifiers. it should typically
be left at 0 dB during use. (adjust in Lab.gruppen
info, Status tab)
Amp Gain
Corresponds to the gain that you would
have available in a conventional system if
the amplifier section was outside the PLM.
it should retain the same settings as in the mod-
ule file that is loaded. the limiter and output gain
settings in the output stage of the module
were configured with this gain setting and will
not be automatically compensated if changes
are made. this configuration scheme, though unusual,
allows for backwards compatibility with other Dolby
products. (Set in Lab.gruppen info, Control tab.)
6.6 Gain / Level Optimization
Optimum setting of the pLM gain structure
requires particular attention to two matters:
Make sure it can get loud enough.
to do this, the user should ensure that there is suf-
ficient headroom in the signal path to avoid clipping
before you reach the limiters. at the same time, it
must be possible to achieve enough gain through the
PLM to engage the limiters and realize a high average
SPL as a consequence. as an optimal setting, allow
for a headroom of 10 dB or more for all channels. the
simplest way to accomplish this is to increase the input
gain on the module.
Minimize the noise.
as a first step, use a digital input signal (aES or Dante)
when possible. if using analog inputs, ensure that
headroom is not introduced on the input side that
is unused or unreasonably high. if full power is not
required, or at least not a high average power, you may
also lower the gain on the input of the module.
QUICK sTArT TUTOrIAl 6
Figure 6.5: PLM Signal Flow Diagram (Part 2)
Input
Router
1
(Mute)
Input
Router
2
(Mute)
Input
Mixer A
Input
Mixer B
EQ
Delay
EQ
Delay
Crossovers
Output EQ
Output EQ
Output EQ
Output EQ
Output Routing
AMP
Attenuator
Mute
Phase Rev
Attenuator
Mute
Phase Rev
Attenuator
Mute
Phase Rev
LoadSmart
SpeakerSafe
LoadSmart
SpeakerSafe
LoadSmart
SpeakerSafe
LoadSmart
SpeakerSafe
Amp Gain
Amp Gain
Amp Gain
Amp Gain
Attenuator
Mute
Phase Rev
Module:
Gain
Phase Rev
Mute
Analog 1/2
AES 1
AES 2
Dante X
Dante Y
Analog 1/2
AES 1
AES 2
Dante X
Dante Y
AMP
AMP
AMP
ISVPL
ISVPL
ISVPL
ISVPL
LimiterMax
RMS / Peak
LimiterMax
RMS / Peak
LimiterMax
RMS / Peak
LimiterMax
RMS / Peak
Module Output:
Gain/Level
Phase Rev
Mute
Module:
Gain
Phase Rev
Mute
Module Output:
Gain/Level
Phase Rev
Mute
Module Output:
Gain/Level
Phase Rev
Mute
Module Output:
Gain/Level
Phase Rev
Mute
4
1
2
3
1
2
3
5
6