APOGEE ELECTRONICS
8
BIG BEN – User’s Guide
APOGEE ELECTRONICS
9
BIG BEN – User’s Guide
10) WC OUT 6 – Similar to the WC OUT 5 parameter, the frequency of
Word Clock Output 6 may be set to a multiple of the SAMPLE RATE.
Valid settings are determined by the SAMPLE RATE
as depicted in FIGURE 4 below
If the UP button is pressed while powering up the unit, WC outputs 5 & 6
transmit clock signals suitable for DSD devices, as depicted in FIGURE 5
below. WC OUT 5 & 6 default to fsx1 and may not be modied
11) WC OUT/TERMINATION – Correct termination of word clock inputs
is crucial to a stable clock conguration. The 6 WC OUT/TERMINATION
LEDs indicate whether each of Big Ben’s six Word Clock outputs have
been properly terminated at the inputs to which they are connected.
Three states of termination are indicated for each word clock output:
• Red LED on – Input is OVER terminated
• Green LED on – Input is correctly terminated
• No LED on – Input is un-terminated or output is not connected
Navigating the Front Panel - continued
Termination sensing can also be
used to verify the integrity of word
clock cables by following these
steps (Big Ben must be locked to perform
this test):
1) Connect one end of the cable
being tested to one of Big Ben’s
word clock outputs, and leave
the other end unconnected - the
corresponding Termination Sensing
LEDs should remain unlit; if the red
LED lights, then the cable’s shield is
shorted to it’s center conductor.
2) Now connect a 75 ohm termination
plug to the unconnected end of the
cable - the corresponding green
Termination Sensing LED should
light; if no LEDs light, then either
the shield or center conductor has
become open. If the red LED lights
again, then either the connector has
shorted or a 50 ohm termination
plug is connected.
192/176.4 96/88.2 48/44.1
fs x 256 x x valid
fs x 4 x x valid
fs x2 x valid valid
fs x1 valid valid valid
fs/2 valid valid x
fs/4 valid x x
WC OUT
5&6 value
Big Ben SAMPLE RATE
FIGURE 4
FIGURE 5
192/96/48 kHz 176.4/88.2/44.1kHz
WC OUT 5 (Fs x64 at 44.1/48kHz) 3.072 MHz 2.8224 MHz
WC OUT 6 (Fs x128 at 44.1/48kHz) 6.144 MHz 5.6448 MHz
10 11
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