Chapter 5: Troubleshooting
The Linear Acoustic AERO.lite is a very stable and reliable unit, and most problems can
be traced back to mis-wiring causing incorrect signals to be applied to the unit, or, more
than likely, mis-configuration. As simple as this unit is to use once installed, it is very
flexible and thus a necessarily complex processor. In an effort to speed troubleshooting,
some common problems and solutions are described below.
5.1 Problems and Possible Causes
5.1.1 Unit Won’t Power On
At the risk of sounding like the start of a horribly long and cliche-ridden technical support
call, check the obvious and make sure the power cord or cords are plugged into a live
AC outlet (it happens).
The next thing to check is the power supply fuse. Remove the power cord and use a
small, flat-blade screwdriver to carefully remove the fuse holder from the IEC inlet
module. The holder carries a spare fuse and extras were included in the packing kit with
the unit. If the fuse is bad and continues to blow, please contact the factory.
5.1.2 Output Audio Clicks and Pops
The most likely culprit of clicks and pops is incorrect reference. The AERO.lite contains
sample rate converters that are active by default and allow digital audio signals of any
sample rate to be accepted. For installations in digital environments, the AERO.lite
digital outputs
should slave to plant timing. This can be accomplished by ensuring that
proper reference is connected and selected: If using the AES outputs, reference should
be set to AES Input or AES Reference, or even SDI. For SDI, reference is automatically
set to SDI. Internal Reference should be reserved for asynchronous use, such as when
using only the analog outputs.
Note that clicks and pops can also originate upstream of the unit. Since AERO.lite will
add gain to the input signal, these noises may become more apparent.
5.1.3 Audio Pumps and Breathes
These artifacts are sometimes audible in less sophisticated processors or when the
attack and release times are not properly adjusted. The factory presets included with
the AERO.lite will not cause pumping or breathing. If you do detect these artifacts, it is
possible that audio is being processed somewhere in the plant by legacy gear that has
not been removed from the signal path. The AERO.lite performs best when it receives
unprocessed audio. If you are using a custom preset in lieu of a factory preset, closely
examine attack time, release time, and gating controls and adjust as necessary to avoid
these artifacts.
5.1.4 Problems with EAS Encoding
EAS encoding equipment should be located after any audio processor, including
AERO.lite. It is critical that processing be minimized for use with current EAS systems.
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