HK Audio FirNet - Page 7

7
17 AES/EBU IN Digita
l
Au
d
io Inpu
t
C
onnect si
g
nal sources with di
g
ital outputs to these three-pin
f
emale
X
LR soc
k
ets. Pin assi
g
nments are pin 1 =
g
roun
d
, pin 2 = si
g
na
l
, an
d
pin
3 = signal. The FIRNET controller accepts sampling rates of
4
8 kHz and 96 kHz, which ma
y
be selected via a menu option.
I
nput-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
O
UTPUT D receive their signal from analog INPUT B, that is, the right
channel o
f
the digital AES/EBU signal. You can reroute signals in the
L
IPAN so
f
tware’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
a
ssignments are pin 1 = groun
d
, pins 2 an
d
3 = signa
l
. T
h
e FIRNET
a
mpli
fi
es the incoming digital audio signal to preserve signal quality. I
f
a
F
IRNET controller drops out, the si
g
nal is routed directly from the di
g
ital
A
ES/EBU IN to the di
g
ital AES/EBU OUT via a parallel circuit.
To select the di
g
ital input,
g
o to the Admin menu (press ADMIN once),
choose the menu option Input Options (press 1x
S
), and then press
E
NTER
to
co
nfi rm:
Menu option -
A
DMIN/Input Options/ Input Source
S
ynchronization Ports
f
or Analo
g
Audio Si
g
nals:
I
f you wish to address several FIRNET controllers via their analog inputs,
y
ou can use
d
igita
l
AES/EBU IN inputs an
d
AES/EBU OUT outputs
to synchronize these controllers to ensure the audio signal remains
co
h
e
r
e
n
t.
To do this, connect the
fi
rst FIRNET controller’s digital AES/EBU OUT
to t
h
e secon
d
FIRNET’s
d
igita
l
AES/EBU IN. T
h
en connect t
h
e secon
d
F
IRNET contro
ll
er’s
d
igita
l
AES/EBU OUT to t
h
e t
h
ir
d
FIRNET’s
d
igita
l
A
ES
/
EBU IN, and so forth.
L
eave 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
t
he clock for the other slaved controllers, so access this FIRNET’s menu
f
unction to select the internal clock. Con
fi
g
ure the other controllers so
th
ey accept sync
h
ronization comman
d
s via t
h
e AES/EBU si
g
na
l
an
d
select their analog inputs for the audio signal using the appropriate
menu o
p
t
i
ons
.
Note: The Sync LED on subsequent controllers in the network light up to
confirm they are synchronized.
19 INPUT A, INPUT B Analog Audio Input
s
C
onnect signal sources with analog outputs to these three-pin
f
emale
X
LR soc
k
ets. Pin assignments are pin 1 = groun
d
, pin 2 = signa
l
(+),
pin 3 = signa
l
(-). T
h
ese e
l
ectronica
ll
y
b
a
l
ance
d
ports’ input impe
d
ance 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
d
Bu, 12
d
Bu, 18
d
Bu, 24
d
Bu) to matc
h
t
h
e FIRNET contro
ll
er’s
i
nput to t
h
e connecte
d
au
d
io
d
evice’s ana
l
og output. Proper matc
h
ing
vast
l
y improves t
h
e si
g
na
l
-to-noise ratio at t
h
e FIRNET contro
ll
er’s
analo
g
input
.
To match levels,
g
o to the Admin menu (press ADMIN once), choose the
menu option Analog Levels (press down arrow thrice), and then confi rm
b
y pressin
g
ENTER
.
Menu option - ADMIN/Analog Level
s
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 Analo
g
Audio Output
s
U
se t
h
ese t
h
ree-pin XLR ma
l
e soc
k
ets to route output signa
l
s to power
amps. Pin assignments are pin 1 = groun
d
, pin 2 = signa
l
(+), an
d
pin 3
= signal (-). These electronically balanced connectors’ output impedance
i
s 35 o
h
ms. T
h
e DA converters’ output
d
ynamic range is >125
d
B (A).
A
menu option lets you adjust the maximum output level in
f
our 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 analo
g
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
English