8/22
9/22
ver. 2021/20/02
DOP_1110_A
ver. 2021/20/02
Technical manual - StepArray series
Technical manual - StepArray series
4. Test before powering up
Before powering up an installation, it is good practice to ensure that the column
cable is properly connected to the column. Therefore, the electrical resistance
of each channel of the column must be controlled at the end of the cable
connected to the amplifier side. The measured electrical resistances values
must correspond to the values below.
Channel
1
2
3
4
5
6
SA100P
6,6Ω
6,6Ω
6,6Ω
-
-
-
SA180P
6,6Ω
6,6Ω
6,6Ω
-
-
-
SA250P
6,6Ω
6,6Ω
6,6Ω
4,4Ω
4,4Ω
4,4Ω
SA400P
6,6Ω
6,6Ω
6,6Ω
6,6Ω
6,6Ω
6,6Ω
SA180S
6,6Ω
6,6Ω
6,6Ω
-
-
-
SA250S
3,3Ω
6,6Ω
6,6Ω
4,4Ω
4,4Ω
3,3Ω
Warning : When measuring the electrical resistance, the cable re-
sistance must be taken into account (about 1,3Ω for 100 meters of
1,5mm² ; 0,7Ω for 100 meters of 2,5mm²)
5. NUT control software
The NUT control software is used to tune the filtering and directivity parameters
of StepArray columns, it is available as free download on Active Audio’s web
site:
http://www.activeaudio.fr/en/public-address-sound-reinforcement/digital-si-
gnal-processor-nut
6. Troubleshooting
Symptom
Possible cause
Solution
The power LED of the
NUT processor is not ON
A fuse burned
Replace inside the NUT
processor (1A delayed
fuse)
The sound is not ho-
mogeneous or distorted
Amplifier to column
connection is incorrect
Make sure columns are
properly connected, as
described in section 3.3
Input signal level is too
high
Reduce input signal level
(Max signal input is ±8V
rms as described in 7.1
on the following page).
Filtering parameters are
wrong
Reduce the gain (Mixer
Block). Correct the
equalization.
There is a wiring pro-
blem.
Make sure the wiring is
correct (see 3.3 on the
preceding page).
The parameters of the
StepArray block are
wrong
Check that the parame-
ters in the StepArray
block of NUT control are
correct.
The column model of
the StepArray block in
NUT control doesn’t
match the real column
model.
Correct the column mo-
del in the StepArray
block.
