dB TECHNOLOGIES AC26N - Manual (Page 12)

a) INPUT AND OUTPUT CHANNELS
The input and output connectors are identified by the same
information provided on the screen printing located on the device
rear side.
With digital input signals, the indications A and B concern the
input.
By rotating the knob FUNCTION SELECTOR [2], input channels,
output channels and general muting indications are cyclically
scrolled (d); the selected channel is highlighted.
b) BAR COMPRESSION LEVEL / CHANNEL MUTING
SIGNAL COMPRESSION
Signal compression is displayed by the vertical scrolling (top to
down) of the right bar
MUTE
Each channel can be individually muted.
Select the channel and press the Push Enter knob [2] to confirm
the change of status.
The indication of the channel will be replaced by the letter M and
the bar will be completely highlighted.
To restore normal operation, repeat the actions described above.
c) SIGNAL LEVEL BAR
The level indication for each channel is provided by scrolling the
left bar.
d) GENERAL MUTING
It is possible to mute all the inputs and outputs simultaneously.
Rotate the knob FUNCTION SELECTOR, select the letter M and
press the Push Enter knob.
To restore normal operation, repeat the actions described above.
The general mute has the highest priority with respect to the
muting of individual channels
e) CONTROL MODE
It shows how the AC26N is used and/or to which devices it is connected.
Local = stand-alone usage
No connection to an external device
NET = directly connected to dedicated RDnet network and to computer
USB = directly connected to another computer via USB cable
f) SETTING STATUS INDICATION
This indication shows if the loaded program was amended in one or more
parameters with respect to the last saving operation.
= original program
= program with modified parameters
g) SET PROGRAM
The number shows the program that is loaded and used by the system, with
reference to the saving position. Refer to the “Preset” menu for further details.
!!
A A A A
A A
3 3
A A M M
0dB
22dBu
-20dB
-60dBu
MENU DESCRIPTION - CH. JOB
This window allows to view the configuration of each individual channel
Ch. ob
X-Over
Option
Ch. ob
X-Over
Option
Meters
Preset
Matrix
Meters
Preset
Matrix
A : 13.5mS
B : +6.50dB 0.0mS
1 : -10.00dB 3.5mS
2 : +0.00dB 0.0mS
+0.00dB A : 13.5mS
B : +6.50dB 0.0mS
1 : -10.00dB 3.5mS
2 : +0.00dB 0.0mS
+0.00dB
a b c d e f g
a) INPUT AND OUTPUT CHANNELS
The input and output connectors are identified by the same information provided on
the screen printing located on the device rear side.
b) SIGNAL LEVEL
It shows the signal gain The increased signal intensity is expressed in decibels (dB).
Such parameter can be selected in the range from -80.00 dB to +20.00 dB in steps
of 0.01 dB.
An increase of 6 dB is approximately equal to doubling - in a linear scale - the signal
voltage level
If the gain exceeds 0 dB the signal is amplified, while if the gain is lower than 0 dB
the signal is attenuated.
c) SIGNAL DELAY
The reproduced audio signal may be delayed to perform an acoustic alignment.
This compensates for the different positions of the speakers during the installation
and the sound reproduction; it is expressed in ms. The parameter can be selected in
the range from 0.0 ms to 72.9 ms in steps of 0.1 ms.
The following formula can be used to align an audio signal:
Delay = (GAPx1000)/344
Delay = ms (in milliseconds)
GAP = distance between speaker and reference point (in meters)
Speed of sound = 344 m/s
E
n
g
lis
h
22
E
n
g
lis
h
21
d) MUTE
Each channel can be individually muted. The same command
can be activated in the Meters Menu.
NOTE: The general mute has the highest priority with respect to
the muting of individual channels.
e) Phase
It performs a phase rotation of 180° with respect to the input
signal.
Such phase rotation allows the optimization, in special way for
low frequencies in complex installations.
M M
f) EQUALIZATION
This control opens the menu controlling the single channel equalization. It is mainly
used to correct one or more frequencies that must be reduced or increased.