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Linear Acoustic AERO.ASI User Guide
Chapter 4: Troubleshooting
AERO.ASI is reliable and easy to install. Most problems turn out to be wiring mistakes that apply in-
correct input signals. However, it is a powerful processor with many user-adjustable parameters, some
of which interact. If you cannot find the source of a problem, simplify the signal path. Hard-bypass is
one of AERO.ASI's best troubleshooting features. To instantly remove AERO.ASI from the signal
path, remove AC power from both inlets.
The unit does not power on
1. Check whether the front panel logo is back-illuminated blue and that the fan is turning when
AC power is applied.
The boot process may take up to two minutes. If the unit boots, you are done.
If the fan spins but the unit still does not boot, continue.
2. Remove the AC cords and wait two minutes.
3. Plug both AC cords back in to power the unit on.
AERO.ASI will automatically power back on.
Dialogue causes surrounds to pump
The current preset may be too aggressive, fast, or the Gate and Freeze settings are inappropriate for
the content. Since all processing channels in a program are linked, they all receive the same gain reduc-
tion and expansion. The loudest channel initiates the gain control, so it can seem that the surrounds
are ducked by dialogue. Choose a moderate preset, and then carefully adjust Gate and Freeze so crowd
noise does not increase when dialogue stops.
Output audio clicks and pops
The AES Reference may be missing or at the wrong sample rate; the unit expects to lock to 48 kHz.
AERO.ASI defaults to an internal 48 kHz reference if the external reference is removed or missing.
This allows audio to continue, but with asynchronous inputs and outputs (due to the sample rate con-
verters on each input pair). Make sure to connect a valid reference signal to avoid this issue.
An improper reference signal in equipment located up- or downstream from AERO.ASI can also
cause output noise. Use master bypass to verify that AERO.ASI is not the problem.
Input audio has dropouts
The Dolby Digital AC-3 encoder is probably not properly referenced with respect to the DTV video
encoder/multiplexer. Normally, all gear is referenced to the local plant.
In some cases (i.e., some Tandberg devices), the multiplexer generates a special reference signal that
must be routed back to the Dolby Digital (AC-3) encoder and used as its reference. Consult your DTV
encoder reference manual for more details.
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