HK Audio CAD 208 - Handbuch (Seite 21)

21
Leave the first FIRNET’s digital AES/EBU IN and the last FIRNET’s digital AES/
EBU OUT unoccupied. The first FIRNET is the master, providing the clock for
the other slaved controllers, so access this FIRNET’s menu function to select
the internal clock. Configure the other controllers so they accept synchroniza-
tion 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 con-
firm they are synchronized.
19 INPUT A, INPUT B Analog Audio Inputs
Connect signal sources with analog outputs to these three-pin female XLR so-
ckets. Pin assignments are pin 1 = ground, pin 2 = signal (+),
pin 3 = signal (-). These electronically balanced ports’ input impedance is 9 k-
ohms. An electronic filter 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 confirm 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.
Adjust the FIRNET’s analog output signal’s maximum level (Max. Output) to
match the downstream power amp.
Heads up: Correct limiter settings ensure the FIRNET operates safely with the
various power amplifiers that drive HK AUDIO loudspeakers. To this end, ad-
just Max. Output Level settings as follows:
Gain (L.A.B. FP10000Q): + 26 dBu
Voltage Peak Limiter: 150 V, Soft Mode
Max Output (Firnet): + 18 dBu
Settings for HK AUDIO VX 2400 amps:
Gain VX 2400: + 35 dBu
Max Output ( Firnet): + 6 dBu
Important note:: The FIRNET’s limiter cannot effectively attenuate signals when
set to other dBu levels, so connected speakers may be damaged or destroyed.
Menu Options
A General Survey of Menu Options:
Mute Output A/B/C/D
These control keys serve to mute individual outputs. Simply press and hold the
Admin key while pressing key 1 to 4 to select and mute an output.
A General Survey of Control Keys:
Start Menu - Viewing Current Settings
The device begins booting as soon as it is -connected to the mains supply and
powered up. The display first reads TEST, and then a < symbol wanders across
the display. At the end of the boot sequence, the display indicates the current
firmware for about two seconds.
Then the controller’s start menu shows the -following parameters:
Fig. 33: FirNet™ – Rear
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