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PLM Series Operation Manual rev 1.1.3
9. Front Panel Interface
dB. This parameter may be adjusted by pressing the associated soft button to highlight the current sensitiv-
ity/offset value, and using the rotary encoder.
All input selection and sensitivity parameters may also be adjusted from the Lake Controller software.
9.13.3.2 Iso-Float
This option is selected by pressing soft button 4
(Iso-Float)
from Menu
è
Input Cfg.
The PLM’s analog inputs utilize Iso-Float transformerless electronic balancing circuitry. This provides electri-
cal isolation from an analog source comparable to that achieved with transformer-based designs. However,
pin 1 of the XLR input connector may be connected to ground within the PLM if desired. This option is
selected by using the rotary encoder to toggle between
Floating
and
Grounded
. It may be necessary
under some circumstances to alter this setting to resolve ground loop problems when using analog inputs.
The Iso-Float setting may also be adjusted from the Lake Controller software.
9.13.3.3 AES/EBU input termination
This option is selected by pressing soft button 8
(AES Term)
from Menu
g
Input Cfg.
For fault-free operation when using AES/EBU digital audio as an input source, inputs must be correctly
terminated with the characteristic impedance of 110 ohm. Whether a particular unit in an set of multiple
PLMs should have its AES/EBU input terminated will be determined by the method used to distribute the
AES/EBU signals.
If the PLM is at the end of a distribution line, its setting should be
Terminated
. Otherwise, it should be
Unterminated
. If an AES/EBU distribution amplifier (DA) is being used to distribute the digital audio signals,
with one DA output per PLM, then all terminations should be on. However, if the AES/EBU link connectors
are being used to “daisy-chain” the PLM inputs together, then only the “last” PLM in the chain should have
its termination set on.
Once the Menu
è
Input Cfg
è
Aes Term page is displayed, the rotary encoder can be used to change
the termination setting from
Unterminated
to
Terminated
.
9.13.4 Attenuation submenu
This submenu is selected by pressing soft button 4, labeled
Attenuation
from the menu top page.
Please see the warning regarding using AES/EBU
signals at section 6.2.1.
