FIRNET Controller 1.0
Menu option - Sample Rate/Digital Clock Sync
6 INPUT A, INPUT B Analog Audio Inputs
Connect signal sources with analog outputs to these
three-pin female XLR sockets. Pin assignments are
pin 1 = ground, pin 2 = signal (+), pin 3 = signal
(-). These electronically balanced ports’ input
impedance is 9 k-ohms. An electronic fi lter protects
them against HF interference.
A menu option lets you adjust input sensitivity in
four steps (6 dBu, 12 dBu, 18 dBu, 24 dBu) to match
the FIRNET controller’s input to the connected au-
dio device’s analog output. Proper matching vastly
improves the signal-to-noise ratio at the FIRNET
controller’s analog input.
To match levels, go to the Admin menu (press
ADMIN once), choose the menu option Analog
Levels (press down arrow thrice), and then confi rm
by pressing ENTER.
Menu option - ADMIN/Analog Levels
The FIRNET uses stacked AD converters to achieve
>130 dB (A) input dynamic range.
Note: You must manually set analog levels to
18 dBu after a firmware update (see section 7,
Analog Signal Outputs).
7 OUTPUT A to OUTPUT D Analog Audio Outputs
Use these three-pin XLR male sockets to route
output signals to power amps. Pin assignments
are pin 1 = ground, pin 2 = signal (+), and pin 3 =
signal (-). These electronically balanced connectors’
output impedance is 35 ohms. The DA converters’
output dynamic range is >124 dB (A). A menu
option lets you adjust the maximum output level in
four steps (6 dBu, 12 dBu, 18 dBu, 24 dBu) to match
the levels of the FIRNET controller’s output and the
connected power amp’s analog input.
Note: When driving HK AUDIO speakers with
a combination of FIRNET controller and LAB
FP10000Q power amps, set the maximum output
level (Max. Output) to 18 dBu. The FIRNET’s limiter
cannot effectively attenuate signals when set to
other dBu levels, so connected speakers may be
damaged or destroyed.
The following adjustments must be made to ensure
limiters work properly in combination with the LAB
group FP10000 power amp:
• Voltage Peak Limiter (VPL): 150 V in Soft mode
• FP10000Q gain: 26 dB
Adjust the FIRNET’s maximum output level to:
18 dBu!
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