SE Audiotechnik IC 32 User guide

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www.se-audiotechnik.de
APPLICATION GUIDE
L 35 & IA 402D

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INTRODUCTION
SE AUDIOTECHNIK® is constantly looking the best ways to provide the products, tools and resources to
provide competent and satisfactory solutions for a wide range of PA applications. Among these e󽗿orts,
special attention is given to the proper pairing of products from di󽗿erent lines, o󽗿ering better and more
complete systems to our customers.
With this in mind and from 󽘀rmware version 20200826, the IA 402D ampli󽘀ers include additional presets
to use with L 35 or L 35 R line array systems, as well as their respective 󽘁yable subwoofers.
Furthermore, both B 15A and S 112i PRO subwoofers have also one preset to use speci󽘀cally with
L 35 loudspeakers. Therefore, both of them can be used as ground-based low-frequency extensions
to broaden the working range of L 35 line arrays.
This application guide gives then further insights about the use and con󽘀guration of systems comprising
the mentioned loudspeakers and subwoofers.
Please, refer to the dedicated user manual for further information of each product:
- S 112i PRO subwoofer and IA 402D ampli󽘀er: I-Line User Manual
- L 35/R and L 35 FS/R: L-Line User Manual – Loudspeakers
- B 15A subwoofer: B-Line User Manual
These can be can be openly downloaded from our website www.se-audiotechnik.de.

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WIRING
The IA 402D ampli󽘀ers use 4-pin Phoenix terminals and speakON® NL4 and connectors to output audio
signals, being the later the most recommended option. Equally, L-Line loudspeakers use speakON® NL4
connectors to input and pass ampli󽘀ed audio signals. These wires should be connected as shown below:
speakON NL4 speakON 1 speakON 2
Connection Wiring Scheme
2
1
1+ 1+
2+ 2+
1- 1-
2- 2-
As detailed in the L-Line User Manual – Loudspeakers, L 35/R units include on the rear a switch to select the
source of the input signal from the NL4 connector, namely pins 1+/1- or 2+/2-. The signal chosen is the one
delivered to the transducers.
With a single NL4 cable, it is possible to send independent signals to L 35 FS and/or L 35 units in
the same array. Then, the input switch on each unit allows to select the pins carrying the signal
it must reproduce.
Finally, IA 402D ampli󽘀ers can input and link audio signals through XLR-3 connectors. They follow the next
plug-in and con󽘀guration scheme:
XLR-3 IN
Click Click 2 21 1
3 3
XLR-3 OUT
Connection
XLR-3 Female
Shield
Cold
Hot
XLR-3 Male
Wiring Scheme
It is recommended to use cables with at least 18 AWG conductor size. For long cable lengths, the maximum
conductor size is 14 AWG. Those wires must be assembled by a quali󽘀ed technician.
Figure 1. SpeakON® NL4 plug-in and link cable connection.
Figure 2. XLR-3 plug-in and cable connection.
CONVENTIONS IN THIS GUIDE
Symbol to alert the user about
important operating or maintenance
instructions.
Symbol for practical tips and ideas
useful to ensure the correct use of the
product and improve its operation.
In addition, the term L 35/R refers to both versions of L 35: L 35 indoor or L 35 R outdoor version.
Correspondingly, L 35 FS/R indicates the indoor and outdoor versions of the 󽘁ysubs.

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USE WITH L 35 FS/R
L 35 FS/R allow to extend the low frequency range of L 35 or L 35 R line arrays and for that, IA 402D can
power up to two 󽘁ysubs per channel. As shown before, there are two presets for L 35 FS/R: one to use
indoor with L 35 and, other to use outdoor with L 35 R.
These presets set the optimal crossover frequency between both systems but, in order to de󽘀ne the
balance of the total response, the gain of each way must be set as desired. Values below are a right basis
for further adjustments:
Pieces of L 35 FS Pieces of L 35/R L 35/R Gain L 35/R Preset
1 2 -6 dB 2L35Sat/R
2 2 0 dB 2L35Sat/R
2 4 -6 dB 4L35Sat/R
In all those cases, L 35 FS gain is 0 dB, IA 402D Input Sensitivity is +4 dBu and the preset for each channel
powering L 35 FS 󽘁ysub/s is L 35FS+Sat/R.
Some applications may comprise additional ground-based subwoofers to reproduce frequencies below
the range of L 35 FS/R 󽘁ysubs. A good starting point for that adjustment would be:
Pieces of L 35 FS Pieces of L 35/R L 35 FS/R Gain L 35/R Gain
1 2 0 dB -3 dB
2 2 -3 dB 0 dB
2 4 0 dB -3 dB
Additionally in the IA 402D ampli󽘀er, an Input Sensitivity of +4 dBu must be set and, a delay of 2.1 ms
should be applied to the L 35/R and L 35 FS/R channels, in order to align in time the array and the
additional subwoofer/s. This time alignment should be con󽘀rmed through accurate measurements in-situ.
LIST OF PRESETS
From 󽘀rmware version 20200826, IA 402D ampli󽘀ers include the following presets to work with di󽗿erent
SE AUDIOTECHNIK® products:
Product Preset Name Description Units per channel
IC 32 IC 32 For powering up to four IC 32 columns. 1 - 4
IC 34 IC 34 For powering up to two IC 34 columns. 1 - 2
IC 38 IC 38X For powering IC 38X columns. 1
L 35
2L35Sat For array of up to two L 35 units, used indoor as
"satellite" and with additional subwoofer. 1 - 2
4L35Sat For array of up to four L 35 units, used indoor as
"satellite" and with additional subwoofer. 3 - 4
8L35Sat For array of up to eight L 35 units, used indoor
as "satellite" and with additional subwoofer.
3 – 4
(2 channels needed)
2L35FR For indoor array of up to two L 35 units
full-range, without subwoofer. 1 - 2
4L35FR For indoor array of up to four L 35 units
full-range, without subwoofer. 3 - 4
8L35FR For indoor array of up to eight L 35 units
full-range, without subwoofer.
3 – 4
(2 channels needed)
L 35 R
2L35R For outdoor array of up to two L 35 R units.
Additional subwoofer usage is recommended. 1 - 2
4L35R For outdoor array of up to four L 35 R units.
Additional subwoofer usage is recommended. 3 - 4
8L35R For outdoor array of up to eight L 35 R units.
Additional subwoofer usage is recommended.
3 – 4
(2 channels needed)
L 35 FS L35FS+Sat For up to two L 35 FS used in L 35 line arrays
indoor. 1 - 2
L 35 FS R L35FS+R For up to two L 35 FS R used in L 35 R line arrays
outdoor. 1 - 2
Subwoofer Sub General con󽘀guration to use with other passive
subwoofers. -
General Flat General con󽘀guration to use with other
products or as a base for custom user presets. -
Use each of these presets only with the corresponding product stated.
And do not connect more units to each IA 402D channel than those speci󽘀ed in the table.
Factory presets provide natural sound and even frequency response between products in the
close distance.

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USE WITH S 112i PRO
For some installation applications, the S 112i PRO subwoofer may be more suitable and preferred to
work with L 35 arrays. In those cases, the following quantities, levels and con󽘀gurations can be taken
as a reference:
Number of S 112i PRO Number of L 35/R S 112i PRO Gain L 35/R Preset
1 2 -12 dB 2L35Sat/R
1 4 -6 dB 4L35Sat/R
1 8 0 dB 8L35Sat/R
2 4 -12 dB 4L35Sat/R
2 8 -6 dB 8L35Sat/R
S 112i PRO Parameters
Low-pass 󽘀lter LR24 @ 145 Hz
Phase inversion NO
Input Sensitivity 0 dBV
Preset L 35
IA 402D Parameters
Delay 0.73 ms
Channel gain 0 dB
Input Sensitivity +4 dBu
USE WITH B 15A
Below, the table on the left details recommended gain and quantity values for systems including L 35/R
arrays and B 15A subwoofers. The one on the right, speci󽘀es the parameters for B 15A con󽘀guration. In all
combinations, IA 402D ampli󽘀ers have an Input Sensitivity of +4 dBu and its output level is 0 dB.
B 15A Pieces L 35/R Pieces B 15A Gain L 35/R Preset
1 2 -11 dB 2L35Sat/R
1 4 -5 dB 4L35Sat/R
1 8 0 dB 8L35Sat/R
2 4 -11 dB 4L35Sat/R
2 8 -5 dB 8L35Sat/R
B 15A Parameters
Low-pass 󽘀lter LR24 @ 145 Hz
User delay 0.7 ms
Phase inversion YES
Input Sensitivity +4 dBu
Preset L 35
When L 35 FS/R 󽘁ysubs are included in the L 35/R line array, it is recommended to respect the following
combinations and parameters for B15A:
L 35/R L 35 FS/R B 15A Gain
Pieces Pieces 1 piece 2 pieces
2 1 -12 dB
4 2 -6 dB -12 dB
8 4 0 dB -6 dB
B 15A Parameters
Low-pass 󽘀lter BW24 @ 80 Hz
Phase inversion YES
Input Sensitivity +4 dBu
Preset L 35
In those three cases, the Input Sensitivity of IA 402D ampli󽘀ers is +4 dBu, and the gains for L 35/R and
L 35 FS/R are respectively -3 dB and 0 dB. In addition, a delay of around 2.1 ms must be applied to all
L 35/R and L 35 FS/R channels to align in time the array and the B 15A subwoofer/s. This time alignment
should be con󽘀rmed through accurate measurements in-situ.

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1110
Additional frequency adjustment (EQ) for 3x L 35 at splay angles 0°, 2.5°, 5°, 7.5°, 10°
Figure 4. Additional frequency adjustment for splay angles: 3 x L 35 with 0°, 2.5°, 5°, 7. 5° and 10°.
Additional frequency adjustment (EQ) for 4x L 35 at splay angles 0°, 2.5°, 5°, 7.5°, 10°
Figure 5. Additional frequency adjustment for splay angles: 4 x L 35 with 0°, 2.5°, 5°, 7. 5° and 10°.
main
axis
main
axis
main
axis
5° splay
angle
7.5° splay
angle
10° splay
angle
2.5° splay
angle
main
axis
main
axis
Nom. vertical
coverage +10°/-20°
Nom. vertical
coverage +10°/-25°
Nom. vertical
coverage +10°/-30°
No further EQ needed Add. EQ 1:
+1.5 dB, 14.5 kHz, Q 2
Add. EQ 1:
+3 dB, 14 kHz, Q 1.5
Add. EQ 1:
+6 dB, 13 kHz, Q 2
IA 402D IA 402D IA 402D IA 402D IA 402D
L 35 L 35 L 35 L 35 L 35
Add. EQ 1:
+8 dB, 12 kHz, Q 2
Nom. vertical
coverage +10°/-15°
Nom. vertical
coverage +/-10°
main
axis
main
axis
main
axis
5° splay
angle
7.5° splay
angle
10° splay
angle
2.5° splay
angle
main
axis
main
axis
Nom. vertical
coverage +10°/-25°
Nom. vertical
coverage +10°/-32.5°
Nom. vertical
coverage +10°/-40°
No further EQ needed Add. EQ 1:
+3 dB, 13.7 kHz, Q 2.2
Add. EQ 1:
+6 dB, 11.7 kHz, Q 1.5
Add. EQ 1:
+7 dB, 8.7 kHz, Q 1.2
IA 402D IA 402D IA 402D IA 402D IA 402D
L 35 L 35 L 35 L 35 L 35
Add. EQ 1:
+8 dB, 8 kHz, Q 1
Nom. vertical
coverage +10°/-17.5°
Nom. vertical
coverage +/-10°
HF ADJUSTMENT FOR SPLAY ANGLES
In a line array, the splay angles between units can greatly in󽘁uence the response of the system,
especially in the high frequencies. This is mainly due to the decoupling of the di󽗿erent sources:
the greater the splay angles, the more the HF level starts decreasing and from a lower frequency.
In some cases and depending on the application, this may or must be compensated. The graphs below
show the compensation EQs for two, three and four boxes splayed at the di󽗿erent angles available.
These recommended EQs should be applied additionally to the presets and con󽘀gurations
given before for the di󽗿erent combinations of L 35/R and the subwoofers.
Additional frequency adjustment (EQ) for 2x L 35 at splay angles 0°, 2.5°, 5°, 7.5°, 10°
Figure 3. Additional frequency adjustment for splay angles: 2 x L 35 with 0°, 2.5°, 5°, 7. 5° and 10°.
main
axis
main
axis
main
axis
5° splay
angle
7.5° splay
angle
10° splay
angle
2.5° splay
angle
main
axis
main
axis
Nom. vertical
coverage +/-10°
Nom. vertical
coverage +10°/-12.5°
Nom. vertical
coverage +10°/-15°
Nom. vertical
coverage +10°/-17.5°
Nom. vertical
coverage +10°/-20°
No further EQ needed No further EQ needed No further EQ needed Add. EQ 1:
+2 dB, 15 kHz, Q 2
IA 402D IA 402D IA 402D IA 402D IA 402D
L 35 L 35 L 35 L 35 L 35
Add. EQ 1:
+4 dB, 15 kHz, Q 2

Designed in Germany
Version 2021/03
HEAD OFFICE
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42657 Solingen, Germany
[email protected]
ASIA-PACIFIC DEVELOPMENT CENTER
No. 8 Development Zone Road
Huimin Sub-district, Jiashan County, Zhejiang, 314112, P.R. China
[e-mail]
www.se-audiotechnik.de
, all rights reserved. The technical data and the functional product characteristics can be subject to modi󽘀cations.
The photocopying, translation, and all other forms of copying of fragments or of the integrity of this user manual is prohibited.
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EASE® is a registered trademark of AFMG Technologies GmbH.
Neutrik® and powerCON® are registered trademarks of Neutrik AG.