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at about -6 dBFS. In addition to providing the best recording quality, it has the added benefit
that you will operate with 6 dB of headroom before clipping. There is no drawback to optimiz-
ing your levels in this way, and plenty of benefit.
3.1.1.3 Digital Input Meters
To the right of the Analog Input control section is the Digital Input Meter section. This group of
meters provides level metering for all of the digital inputs on the Series 300. These meters have
the same response characteristics as the analog input meters and show you the audio activity
on digital input channels 1-2, going from left to right.
3.1.1.4 System Controls
The System block provides controls that adjust various system level aspects of the Series 300
hardware:
The Clock Source popup menu controls the system clock source used by the hardware for digi-
tal synchronization and driving the converters:
3.1.1.5 Clock Source Menu
Internal: causes the Series 300 to use its internal clock. You must select this if you want to set the sample rate from the Series
300. If any other clock source has been selected, the console will not allow you to change the sample rate since the sample rate
is determined by the external clock source.
WC (44/48): directs the Series 300 to clock off from an external Word Clock source at baseband, 1x rate (e.g. fs = 32-50 kHz)
WC (88/96): directs the Series 300 to clock off of an external Word Clock source at double or 2x rate (e.g. fs = 64-100 kHz)
WCx256 (44/48) directs the Series 300 to clock off of an external 256fs Clock source at 1x rate (e.g. fs = 32-50 kHz)
WCx256 (88/96) directs the Series 300 to clock off of an external 256fs Clock source at double or 2x rate (e.g. fs = 64-100 kHz)
DigIn (44/48) directs the Series 300 to clock off of the selected stereo digital input at 1x rate (e.g. fs = 32-50 kHz). This allows
operation of the digital input without SRC, and from devices that must supply clock.
DigIn (88/96) directs the Series 300 to clock off of the selected stereo digital input at double or 2x rate (e.g. fs = 64-100 kHz).
This allows operation of the digital input without SRC, and from devices that must supply clock.
3.1.1.6 Sample Rate Menu
The Sample Rate menu allows you to select the sample rate when you are using internal clock.
The Series 300 must be running on internal clock for the Sample Rate popup menu to have any
effect. If the Series 300 is referenced to an external clock source, you cannot select the sample
rate since it is determined by the external clock source.
3.1.1.7 WC Out Menu
The WC Out menu allows you to select the output clock signal the Series 300 generates on its
WC Out BNC connector. The available choices are 1x and 256x. The 1x signal is appropriate for
driving devices that accept a Word Clock signal. The 256x signal is appropriate for driving de-
vices that accept 256x or SuperClock signals. Refer to the documentation for the external de-
vice to determine what is the most appropriate clock reference for it.
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