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3.1.1.8 DI Source Menu
The DI Source menu allows you to select the active input for the digital input pair. The choices
are AES and S/PDIF. This selector physically switches the input to the digital audio receiver be-
tween the RCA and XLR input connectors.
3.1.1.9 DI SRC Button
The DI SRC button enables and disables the asynchronous sample rate converter (SRC) in the
Series 300 digital audio receiver. When the SRC is engaged when the button is illuminated yel-
low, the digital audio receiver will automatically synchronize the input signal to the Series 300
system clock over a wide range of sample rate ratios.
This allows you to, for example, digitally transfer a sample from a CD player into a 96 k ses-
sion without any clocking problems. If you want to make bit–transparent transfers, you will
need to disengage the SRC and ensure that the Series 300 and the external device are both us-
ing the same digital audio clock via one of the Series 300 synchronization mechanisms.
The Lock indicators show which elements of the Series 300 clocking system are properly
locked. The clocking system must be locked for the unit to behave as expected. If the system
is not locked, audio will play at the wrong rate and will be distorted or noisy. Under normal
circumstances, the system should always be locked, but if you have selected an external clock
source and the clock signal is not present, corrupted or out-of-range, the system may unlock.
There are indicators for the system and the digital input.
3.1.1.10 Analog Output Control
The bottom half of the panel is dedicated to the hardware outputs of the Series 300.
3.1.1.11 Channel Level Meter
This is a peak reading, high-resolution fast PPM meter. It shows the pre–converter level of the
output signal for the associated channel. The peak hold bar indicates the highest level seen on
the channel since the last reset. You can reset the hold by clicking on the meter. All meter data
is generated by the Series 300 hardware.
3.1.1.12 Digital Output Meters
To the right of the Analog Output controls is the Digital Meters section. This group of meters
provides level metering for all of the digital outputs on the Series 300. These meters have the
same response characteristics as the analog output meters, and show you the audio activity on
ADAT output channels 1-8 and digital output channels 1-2, going from left to right. Please note
that when the box is clocking at 2x rates (88.2-96 kHz), the ADAT output uses pairs of optical
channels to transport the audio and only channels 1-4 will show activity, channels 5-8 will not
display signal. Both channels of the stereo digital output remain active at all sample rates.
3.1.1.13 Box Info
The Box Info section of the panel, in the lower right-hand corner of the window, shows you
information about the currently connected and selected Series 300 unit. This section displays
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