HK Audio FirNet Quick guide - Handbuch (Seite 7)

7
17 AES/EBU IN Digital Audio Input
Connect signal sources with digital outputs to these three-pin female
XLR sockets. Pin assignments are pin 1 = ground, pin 2 = signal, and pin
3 = signal. The FIRNET controller accepts sampling rates of
48 kHz and 96 kHz, which may be selected via a menu option.
Input-Output Signal Routing
The analog INPUT A – that is, the left channel of the digital AES/EBU
signal - delivers the signal to OUTPUT A and OUTPUT B. OUTPUT C and
OUTPUT D receive their signal from analog INPUT B, that is, the right
channel of the digital AES/EBU signal. You can reroute signals in the
LIPAN software’s Admin window.
18 AES/EBU OUT Digital Audio Output
The signal patched into the AES/EBU input can be routed through in
digital format to other devices via this three-pin male XLR port. Pin
assignments are pin 1 = ground, pins 2 and 3 = signal. The FIRNET
amplifi es the incoming digital audio signal to preserve signal quality. If a
FIRNET controller drops out, the signal is routed directly from the digital
AES/EBU IN to the digital AES/EBU OUT via a parallel circuit.
To select the digital input, go to the Admin menu (press ADMIN once),
choose the menu option Input Options (press 1x
S), and then press
ENTER to confi rm:
Menu option - ADMIN/Input Options/ Input Source
Synchronization Ports for Analog Audio Signals:
If you wish to address several FIRNET controllers via their analog inputs,
you can use digital AES/EBU IN inputs and AES/EBU OUT outputs
to synchronize these controllers to ensure the audio signal remains
coherent.
To do this, connect the fi rst FIRNET controller’s digital AES/EBU OUT
to the second FIRNET’s digital AES/EBU IN. Then connect the second
FIRNET controller’s digital AES/EBU OUT to the third FIRNET’s digital
AES/EBU IN, and so forth.
Leave the fi rst FIRNET’s digital AES/EBU IN and the last FIRNET’s digi-
tal AES/EBU OUT unoccupied. The fi rst FIRNET is the master, providing
the clock for the other slaved controllers, so access this FIRNET’s menu
function to select the internal clock. Confi gure the other controllers so
they accept synchronization commands via the AES/EBU signal and
select their analog inputs for the audio signal using the appropriate
menu options.
Note: The Sync LED on subsequent controllers in the network light up to
confirm they are synchronized.
19 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 audio 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 >128 dB (A) input
dynamic range.
Note: You must manually set analog levels to
18 dBu after a firmware update.
20 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 >125 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: Adjust the following settings to ensure the FIRNET operates
properly with the given power amps:
When using FP10000Q amps:
Gain LAB: + 26 dBu
Max D/A Level FIRNET (Admin view): + 18 dBu
When using VX 2400 amps:
Gain VX: + 35 dBu
Max A/D level FIRNET (Admin view): +6 dBu
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