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Linear Acoustic AERO.qc User Guide
6.1.6
Audio Fixed by Re-boot
This can be a very misleading situation. Experience has shown that re-booting can some-
times fix things by interrupting the AES signals thereby causing equipment downstream to
re-lock to the incoming signals. This will sometimes mask the true problem, and a better
method would be to select a minimal processing preset (such as Protection Limit) and ob-
serve the results. Careful and methodical troubleshooting is essential.
6.1.7
Audio Has Artifacts
Sometimes described as "squirrels in the surrounds" this is almost always caused by source
content that has been encoded at too low a rate. For example, some program delivery ser-
vices or server systems may use MPEG 1, Layer 2 audio data reduction to save bandwidth.
When operated at 256kbps or higher per stereo pair, there will be no issues. However,
128kbps or lower can result in coding artifacts that are present in the original stereo and
may be unmasked by upmixing. Note that this content is inferior in quality and will have
similar results without upmixing if consumers matrix decode the signal (which is the de-
fault mode for most home theatre A/V receivers). Our best advice is to take this up with
the program provider or server manufacturer. Today, bandwidth is cheap and there is no
good reason to run lower than 256kbps at a minimum.
- NOTES -
41
Troubleshooting
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