PreSonus FireBox - Manual (Page 26)

6 TECHNICAL
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6 . 1 T R O U B L E S H O O T I N G
Please note that many technical issues can arise when converting a standard
computer into a DAW (Digital Audio Workstation). PreSonus will only provide support
for issues that directly relate to the FIREBOX interface. It may be necessary to contact
the manufacturer of the computer, operating system and/or software to obtain
additional technical support. PreSonus does not provide support for issues in regards
to operating systems, additional hardware or software. Please check our website,
www.presonus.com regularly for software information and updates, firmware updates,
and technical support. Also, technical assistance may be received by calling
PreSonus at 225-216-7887 between the hours of 10 am and 8 PM Central Time.
Pops and Clicks
The light on the front right panel of the FIREBOX is a clock (sync) indicator. It lets you
know if your unit is receiving word clock correctly. Word clock is the manner by which
digital devices sync frame rates. Proper word clock sync prevents digital devices from
having pops, clicks, or distortion in the audio signal (due to mismatched digital audio
transmission). If the symbol is solid blue, this indicates that your unit is in sync with the
computer or a S/PDIF device that is plugged into the S/PDIF input on the back of the
unit. If the light is solid red, this indicates that the FIREBOX does not have sync from
the computer and that the unit might not be connected properly. If the unit is flashing
red and blue, the unit is not receiving external sync. This would be caused by the clock
source in the FIREBOX control panel being set to S/PDIF with no S/PDIF sync source
coming in. Here are the three different light modes broken down once again:
Blue – solid sync
Red – sync not present.
Flashing Red and Blue – external sync not present
Pops and clicks can also occur with high CPU loads (ie; running a large number
of plug-ins, etc) at low latency. Windows XP – try increasing your latency settings
in the FIREBOX’s hardware control panel.