SE Audiotechnik B-LINE User manual

www.se-audiotechnik.de
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MANUAL
B-LINE
LOW FREQUENCIES CONTROL

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THANK YOU FOR CHOOSING
®.
We are happy to be the solution for your sound reinforcement and professional sound needs.
The system you purchased is the sum of 20 years of experience as a loudspeaker manufacturer,
and more than 40 years as a speaker designer. It is the sum of German precision and Chinese
e󽘂ciency, which ensures a high-quality product that will last you for the long-term.
Please, take the time to carefully read this manual and follow its instructions. It will allow you to get the
most out of your product under safe operating conditions and suggest some care instructions leading
to long-term endurance. Keep this manual in a safe place for further reference!
If you 󽘀nd any mistakes or have further questions or suggestions, please contact us at
[e-mail].
For more information about SE AUDIOTECHNIK® products, visit our website www.se-audiotechnik.de.
There you will also 󽘀nd the latest updates to manuals, 󽘀rmware and technical documents for additional
support.
© Copyright by SE AUDIOTECHNIK® 2021. All rights reserved.
The content of this document is subject to change without prior
notice to improve reliability, function, design or otherwise.

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IMPORTANT SAFETY INSTRUCTIONS 6
PACKAGE CONTENTS 9
INTRODUCTION 10
Intended use 11
B-LINE PRODUCTS 12
B15 / B 18 / B 21 Passive Subwoofers 12
B 15A Self-powered Subwoofer 13
B-Line Accessories 16
Wiring 17
LCD PLATE AMPLIFIER 18
Overview Screen 18
Menu 20
DSP Settings 21
System Settings 28
Factory Presets 31
APPLICATIONS 32
Stacking System 32
Subwoofer Arrays 34
RECOMMENDED DSP SETTINGS 42
SPECIFICATIONS 43
B 15 / B 18 / B 21 Subwoofers 43
B 15A 47
MANUFACTURER'S DECLARATIONS 49
LIST OF CONTENTS

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IMPORTANT SAFETY INSTRUCTIONS
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IMPORTANT SAFETY INSTRUCTIONS
The products included in this manual have been engineered and manufactured to ensure your personal
safety. However, IMPROPER USE CAN RESULT IN POTENTIAL ELECTRICAL SHOCK, FIRE HAZARD AND
OTHER HEALTH RISKS. Always follow the basic precautions listed here to avoid the possibility of serious
injury or even death from electrical shock, short-circuiting, damages, 󽘀re or other hazards. These precauti-
ons include, but are not limited to, the following items in this chapter.
CAUTION
RISK OF ELECTRONIC SHOCK
DO NOT OPEN
ELECTRICAL SAFETY PRECAUTIONS
DO NOT EXPOSE ANY OF THIS EQUIPMENT TO RAIN OR MOISTURE, DRIPPING OR
SPLASHING LIQUIDS. OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHOULD
NOT BE PLACED ON THIS APPARATUS.
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT ATTEMPT TO OPEN ANY PART OF THE
UNIT. THERE ARE NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
EQUIPMENT INCLUDED IN THIS MANUAL REQUIRE AC POWER SUPPLY. TO COMPLETELY
DISCONNECT THEM FROM THE AC MAINS, DISCONNECT THE POWER SUPPLY CORD
PLUG FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER SUPPLY CORD
SHALL REMAIN READILY OPERABLE.
NOISE EXPOSURE PRECAUTIONS
PRODUCTS DESCRIBED IN THIS MANUAL CAN RADIATE HIGH SOUND PRESSURE
LEVELS (SPL) THAT CAN LEAD TO IRREVERSIBLE HEARING DAMAGE.
SE AUDIOTECHNIK® RECOMMENDS TO RESPECT THE TIMES OF EXPOSURE TO HIGH SPL.
Noise level (dBA) 85 94 97 112 127
Max. recommended exposure time
per 24 hours 8 hrs. 1 hr. 30 min. 56 sec. 1 sec.
Noise exposure recommendations according to US National Institute for Occupational Safety and Health (NIOSH).
GRAPHICAL SYMBOLS IN THE PRODUCT
The lightning bolt triangle is used
to alert the user to the risk of
electric shock.
Symbol indicating that the equipment
is for indoor use only.
The exclamation point triangle is
used to alert the user to important
operating or maintenance
procedures and instructions.
Symbol for conformity with
Directive 2002/96/EC and
Directive 2003/108/EC of the
European Parliament, on waste
electrical and electronic equipment
(WEEE).
The CE mark indicates the conformity
with the relevant EU directives for
safety, health and environmental
protection. See the Manufacturer's
Declaration section.
The RCM mark indicates the conformity
with the relevant Australian and New
Zealand requirements for electrical
safety, EMC, EME and telecommuni-
cations compliance.
The CCC mark indicates the
conformity with the relevant
Chinese directives for safety, health
and environmental protection.
GRAPHICAL SYMBOLS IN THIS MANUAL
Symbol for important safety
information related with the
risk of electric shock.
Symbol for important concepts
and information for a better
understanding of the functioning
of the product.
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.

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PACKAGE CONTENTS
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IMPORTANT SAFETY INSTRUCTIONS
1. Keep these instructions.
2. Read these instructions.
3. Follow thoroughly all instructions.
4. Read all warnings.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth. Disconnect the device from the AC outlet before cleaning.
Do not use paint thinners, solvents, cleaning 󽘁uids, or chemical-impregnated wiping cloths.
7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including ampli󽘀ers) that produce heat.
9. Do not defeat the safety purpose of the grounding-type plug. A grounding-type plug has two blades
and a third grounding prong. The third prong is provided for your safety. If the provided plug does
not 󽘀t into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the apparatus.
11. Unplug this apparatus during lightning storms or when unused for long periods of time.
12. Use the mains plug to disconnect the apparatus from the mains.
13. Keep away from objects which may be impaired by an external magnetic 󽘀eld. To avoid the
damage of equipment such as computers, video monitors and magnetic data carriers, they
should be located at least 1 meter away.
14. Only use safety pins, attachments, accessories and adapters speci󽘀ed and/or provided by the
manufacturer.
15. Refer all servicing to quali󽘀ed service personnel. This is required when the product has been
damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
16. Do not insert your 󽘀ngers, hands or any other foreign objects into any gaps or openings of the
device.
17. When this product reaches its end of life, take it to a collection point designated by local authorities.
The separate collection and recycling of your product at the time of disposal will help conserve
natural resources and ensure that it is recycled in a manner that protects human health and
environment.
PACKAGE CONTENTS
The packaging of the B 15, B 18 and B 21 passive subwoofers include:
- 1 B 15, B 18 or B 21 unit
- 1 B-Line user manual
- 1 QC PASS card
- 1 Warranty card
The packaging of the B 15A self-powered subwoofer include:
- 1 B 15A unit
- 1 AC power cord with powerCON® connector
- 1 B-Line user manual
- 1 QC PASS card
- 1 Warranty card
Please inspect your product packaging before unboxing it. If it has been damaged during shipping,
unbox the product and check for any visual damage before using it. Notify the shipping company
immediately and contact your SE AUDIOTECHNIK® dealer or support centre for help and assistance.
Finally, save the shipping carton as evidence for the possible claim, which can be requested only by you.
We also recommend you to keep all the packing materials and contents for any further transportation.

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INTRODUCTION
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INTRODUCTION
The B-Line is composed of four powerful subwoofers with a broad range of sizes and capabilities.
They were designed specially to optimise size and low-frequency behaviour, without sacri󽘀cing high
acoustical output.
These subwoofers comprise a sophisticated adaptive port that optimises the air󽘁ow and improves their
response. This technology, developed through exhaustive research, enables a lower cut-o󽗿 frequency
while having smaller volume. This translates into deeper and dynamic bass from a compact enclosure.
In addition, the set of accessories specially designed for the B-Line, makes their setup and transportation
easier, safer and more comfortable.
The B-Line includes the following products:
- B 15: Passive compact subwoofer with 15" driver.
- B 15A: Self-powered version of the B 15 subwoofer with integrated DSP.
- B 18: Passive compact subwoofer with 18" driver.
- B 21: Passive compact subwoofer with 21" driver.
INTENDED USE
These general-purpose subwoofers were conceived to extend the range of sound systems to the lowest
frequencies. Their capabilities allow to create full-range line array systems from small to big setups,
both for permanent installations or portable applications. They can be paired not only with other
SE AUDIOTECHNIK's® products, but also with systems from other brands.
Intended to be used as ground-based subwoofers, they were designed to easily deploy cardioid and
end-󽘀re subwoofer setups, with features as front and rear connections, stable rubber feet, and top
recesses for stacking.
Please, read thoroughly the Applications section for further information about setups, deployment and
possibilities of the B-Line products. In addition, please refer to the M-Line and L-Line user manual for
more details about the right combination of the products of these lines. These manuals can be readily
downloaded from our website www.se-audiotechnik.de.
Figure 1. B-Line products.
B 15 B 15A B 18 B 21

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1 Input / Link 1 - 2. Audio signal inputs and links through speakON® NL4 connectors.
They are connected in parallel between them and with the two front connectors.
With the NL4 topology of these two Input / Link connections, it is possible to handle two
signals over the 1+/1- and 2+/2- poles. Depending on the application, it can be the same signal
traveling over both.
2 Output Ch. 2. Audio signal output through speakON® NL4 connector to pass the signal present in
the 2+/2- poles of the Input / Link 1 and 2, and the front connectors. This signal outputs through
the 1+/1- poles.
In example, this output can be used to deliver full-range signal to the top units in the system,
simplifying the wiring between the ampli󽘀er and the speakers. Find more about this in the
Applications section.
B 15A SELF-POWERED SUBWOOFER
The B 15A is the self-powered version of the B 15 subwoofer. It consists in a single 15" driver in a vented
box, powered by an updated 800 W Class-D ampli󽘀er. Same as B-Line passive models, its improved port
design smooths the air󽘁ow and maximises system capability.
Integrated DSP-presets allow to load di󽗿erent system setups to be used with di󽗿erent SE AUDIOTECHNIK®
products. In addition, the Directivity function enables end-󽘀re or cardioid setups and thus, control the
sound radiation in the low frequencies.
Finally, its e󽘂cient design and compact size guarantees safe and versatile placement even in outdoor
environments, where an additional rain-protection cover can be used to protect the ampli󽘀er panel
from light rainfall.
Features
- High SPL with deep bass and reduced enclosure size
- DSP-Presets for easy subwoofer arrays setup
- Built-in DSP and 800 W of class-D ampli󽘀cation
- Simple to use LCD screen and rotary encoder controller
- Improved feet for increased slip resistance
- Robust and comfortable side handles
- Wide range of supported applications
- Available in black and white colours
Figure 2. Rear panel of the B 21 passive subwoofers. B 15 and B 18 subwoofers have the same panel.
B-LINE PRODUCTS
B 15 / B 18 / B 21 PASSIVE SUBWOOFERS
The B 15, B 18 and B 21 subwoofers are the powerful passive models of the B-Line. These comprise single
15", 18" and 21" drivers respectively, mounted in a vented box. In addition to the speakON® connectors
on the back, these passive models include two additional located on the front. This guarantees wiring
󽘁exibility and ease of use, reducing setup time even in large con󽘀gurations.
Features
- Sophisticated asymmetric port for smooth and laminar 󽘁ow
- Compact enclosure with deeper bass response
- Optimised to use with other SE AUDIOTECHNIK® products
- Frontal connections available for 󽘁exible connectivity
- Intelligent design for a fast and simple setup
- Improved feet for increased slip resistance
- Robust and comfortable side handles
- Wide range of supported applications
REAR PANEL
1 1 2

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REAR PANEL 1 Indicator LEDs:
- Protect: Lights red if the ampli󽘀er has short-circuited or overheated, which will be muted
automatically. Upon reaching normal operating conditions, the device reverts to normal operating
mode after a few seconds.
- Limit: Lights red when the limiter starts working. If the limiter LED lights up permanently or for
longer periods, the gain level should be reduced. Failure to do so may result in a distorted sound.
- Signal: Lights green as soon as an audio signal is present. The input signal monitoring is performed
before the Main Level controller.
- Power: Lights green once the system is properly connected to the mains power and switched on.
2 Alphanumeric LCD for DSP display.
3 Rear panel heatsink.
4 Mounting points for rain cover accessory.
5 Power In. PowerCON® type-A mains power socket. The B 15A subwoofer is intended for two operating
voltage ranges: 100-120 and 200-240 VAC. The electrical conversion is done automatically.
6 Power Out. PowerCON® type-B mains power output to link power between several units in
the system.
The recommended maximum quantity of units to be connected in series is 4 units for
200-240 VAC mains, and 2 for 100-120 VAC.
7 Master control. Rotary encoder with push button for DSP control.
8 Line In. Balanced line-level input with female Neutrik® XLR-3 connector to connect input signal.
Maximum input level is +20 dBu.
For an optimal signal-to-noise ratio, it is recommended to input signals with a level of at
least 0 dBu.
9 Line Out. Balanced and bu󽗿ered line-level output with male Neutrik® XLR-3 connector.
It can be used to link other speakers or components of the system.
10 Power. Switch to turn the unit on and o󽗿.
To avoid clicks and pops, turn on your PA system last and turn it o󽗿 󽘀rst before other connected
devices. Additionally, after turning the unit o󽗿, wait for more than 󽘀ve seconds before turning it
on again.
Figure 3. B 15A rear panel.
4
410
4
4
4
10
8
9
4
1
3
2
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5
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WIRING
B 15 / B 18 / B 21 PASSIVE SUBWOOFERS
For B-Line passive subwoofers, audio signals are input and/or passed through a speakON® NL4 connector.
These wires should be connected as shown below:
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.
B 15A SELF-POWERED SUBWOOFER
B 15A subwoofer use powerCON® connectors for the mains power input and link. Figure 6 shows how to
plug-in and connect these wires.
Additionally, it uses XLR-3 connectors to input and loop audio signals. They follow the next plug-in and
con󽘀guration scheme:
B-LINE ACCESSORIES
Di󽗿erent accessories are available to enhance the possibilities of the B-Line products. Some of them have
been designed exclusively to use these subwoofers with SE AUDIOTECHNIK's® line array units, like M-F3A
PRO and L 35 from the M-Line and the L-Line.
B 15 SFi M B 15 SFi L 35 B 18 SFi M B 18 SFi L 35
B 15 TD B 18 TD B 21 TD SPS20
B 15 TC B 18 TC B 21 TC P801DL RC
B 15 FC B 18 FC B 21 FC
- B 15 / B 18 SFi M: Frame for ground stacking M-Line line array units on B 15 or B 18 subwoofers.
- B 15 / B 18 SFi L 35: Frame for ground stacking L 35 line array units on B 15 or B 18 subwoofers.
- B 15 / B 18 / B 21 TD: Detachable dolly board for safe transportation.
- B 15 / B 18 / B 21 TC: Padded slip cover for storage.
- B 15 / B 18 / B 21 FC: Flight case for one subwoofer.
- SPS20: Pole mount with M20 thread and adjustable height.
- P801DL RC: Ampli󽘀er rain cover to protect the power ampli󽘀er of the B 15A.
Further information about the stacking frames and the right combination with M-Line and L-Line products
can be found in the respective user manual of these lines. Those manuals can be readily downloaded from
our website www.se-audiotechnik.de.
Figure 4. B-Line accessories.
Figure 5. SpeakON® NL4 plug-in and link cable connection.
speakON NL4 speakON 1 speakON 2
Connection Wiring Scheme
2
1
1+ 1+
2+ 2+
1- 1-
2- 2-
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
Figure 6. PowerCON® plug-in and link cable connection.
powerCON IN powerCON 1
L
L
N
N
powerCON OUT powerCON 1
Connection Wiring Scheme
L
N
2
1
Figure 7. XLR-3 plug-in and cable connection.

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LCD PLATE AMPLIFIER
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LCD PLATE AMPLIFIER
The B 15A subwoofer is equipped with a built-in 48 kHz/24 bit DSP processor that provides controlled
signal processing and limiting. This DSP core receives audio signals through dual-range inputs which
improve the SNR, and is easy to manipulate thanks to the rotary control encoder with push button,
and the 4x20 symbol alpha-numeric LCD screen.
This section details the features of the DSP 󽘀rmware, whose adjustable parameters and features include
5 EQ bands, delay, polarity, selection low-pass 󽘀lters and directivity control. In addition, a variety of factory
presets is available to easily setup subwoofer arrays and full-range systems with di󽗿erent products, both
from SE AUDIOTECHNIK's® or other brands.
Some key cursors, symbols and considerations used throughout the menu structure are:
- The 󽘀rst line of each screen is the speci󽘀c name or title of the given screen.
- The cursor ">" marks the current point of action.
- When editing preset names, the cursor "←" indicates deleting function.
- The symbol "*" highlights the selection of a given preset or setting. It indicates also that the edition of
a given parameter is enabled.
- The symbol "L" indicates the lock state of the ampli󽘀er and thus, that the editing of any parameter is
not allowed. This symbol appears only when this is activated, and only in the Overview screen.
Figure 8 details the di󽗿erent menus and functions of the DSP 󽘀rmware, detailed in the following
subsections. Conversely, 󽘀gures 13 and 27 show respectively the functions included in the DSP
Settings and System Settings.
OVERVIEW SCREEN
The Overview screen is the one shown by default on the ampli󽘀er LCD, during normal operation (Figure 9).
It details the next information:
OVERVIEW
IN:
OUT:
GR:
-10
-02
12
>>>>>>>>
>>>>>>>>>>>
654321dB
Figure 9. Overview screen.
- The 󽘀rst row shows the title of the screen and if applicable, the “"L" letter in the top right-corner,
informing the lock state of the ampli󽘀er.
- The second row shows the letters "IN:", followed by a numerical input level meter. The meter shows
the current input level value in dBFS, with minimum "-90" for low or no signal. The ">>>" symbols
show the signal strength relative to the clipping point at 0 dBFS. The readout is replaced with text
"INPUT CLIPPING!" if the signal reaches or exceeds 0 dBFS. In such case, the screen backlight is
󽘁ashing to call the attention of the user.
- The third row shows the letters "OUT:" which are followed by the output level meter. This meter
shows current output level relative to the maximum ampli󽘀er output. If the channel is muted, the level
display meters are replaced with the text "MUTED".
- The fourth row shows the gain reduction in dB "GR:" applied to the signal when the limiter threshold
is reached. When the value increases, new levels appear from right to left, according with the amount
of reduction applied.
Figure 10. Turning the encoder in Overview screen allows to change output gain.
Out Gain: -6.0 dB
Change: -3.0 dB
OUT:-08 >>>>>>>>>>>
GR: 6 5 4 3 2 1dB
OVERVIEW
MENU
DSP SETTINGS SYSTEM SETTINGS
Push Push 3sTurn & Push
Mute/Unmute Current Con󽘀gurationOutput Level
Turn
Figure 8. DSP 󽘀rmware functions and menus.

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From the Overview screen, the following options can be executed with the Master Control rotary encoder:
1. Turn left or right to adjust the output level (Figure 10). The output gain and the relative change in dB
are shown. The output level is always recalled and is not a󽗿ected by any reset function.
2. Turn one step and push to quickly mute or unmute the ampli󽘀er output.
3. Push (without turning) to open the Active Preset Info screen and see both the active preset and
the delay currently de󽘀ned (Figure 11). Clicking "Back" will return to the Overview screen.
Letters "CA" after the name of the preset indicate that the cardioid directivity function is enabled.
End-󽘀re function is denoted as "EF" and normal radiation shows no additional letters.
4. Press and hold 3 seconds to enter the MENU.
Figure 11. Active Presets View.
ACTIVE PRESET INFO
MF3AP : Default CA
USER DELAY:
0.64 ms > BACK
MENU
To enter the MENU of the ampli󽘀er, press and hold the Master Control rotary knob for 3 seconds. A menu
as the one shown in Figure 12 will appear on the screen.
Figure 12. Main Menu.
MENU
> DSP Settings
System Settings
Exit
Two submenus can be accessed from this point:
- DSP Settings: signal processing settings such as presets, 󽘀lters, EQ, delay are con󽘀gured here.
- System Settings: power ampli󽘀er operation settings are con󽘀gured here.
Clicking "Exit" will return to the Overview screen.
DSP SETTINGS
DSP Settings menu is shown in Figure 13.
DSP Settings
> Back
Preset Libary
Lowpass Filter
Directivity
Phase Inversion
EQ 1
EQ 2
EQ 3
EQ 4
EQ 5
Bypass User EQ
Delay
Reset User Params
Input Sensitivity
Exit
Figure 13. DSP Settings menu.
DSP SETTINGS > PRESET LIBRARY
Preset Library menu allows to load and save DSP processing presets. These are divided in two basic types:
- Factory presets: these are the default con󽘀guration for each SE AUDIOTECHNIK's® speaker intended to
be used with your subwoofer, and contain the information about factory pre-de󽘀ned 󽘀lter and limiter
settings.
They are marked with an "F" letter at the right side of the preset name and their details can be found
in the in the Factory Presets subsection.
- User presets: the 8 possible custom con󽘀gurations the user can de󽘀ne, taking the factory presets as
starting point and saving additional adjustments, as:
- User High-pass 󽘀lter settings
- User Low-pass 󽘀lter settings
- User EQ settings
- User Delay settings
- User Phase Inversion (Polarity) settings
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As mentioned, the current loaded preset is marked with the "*" symbol.
PRESET LIBARY
Back
> MF3A
MF3A-P
GENERAL
EMPTY: USER 1
EMPTY: USER 2
FO
F
F
U
U
Figure 14. Preset Library menu.
The names of the presets are organised in such a way that the 󽘀rst symbols will always refer the
loudspeaker model for which the preset has been made. This way, the user knows what factory p
reset was the origin of the custom user preset.
DSP SETTINGS > PRESET LIBRARY > PRESET LOADING
To load a preset, scroll to the chosen one and click the rotary controller. A dialogue is displayed on the
screen to either load preset, save preset or go back. By pressing "Load Preset", the preset is loaded in the
DSP and the message "Load Done" is displayed shortly on the screen.
To return to the Preset Library, choose "Back" and click the rotary controller.
Figure 15. Loading factory preset.
FACTORY PRESET
MF3A : Default
Back
> Load Preset
DSP SETTINGS > PRESET LIBRARY > PRESET SAVING
To save a preset, choose one of the existing or empty user preset locations and click the rotary encoder.
A dialogue similar to factory preset loading is displayed on the screen but in this case, an additional option
is available to save the preset. Saving is only available in the user presets.
Figure 16. Saving user preset.
EMPTY: USER 1
Back
Load Preset
Save Preset>
USER PRESET
By clicking on "Save Preset", a dialogue to de󽘀ne the preset name is displayed. By default, the 󽘀rst
characters of the name are the same of the current loaded preset and can these not be changed.
Thus, before setting and saving any user preset, a factory preset needs to be active.
To customize the name of the new preset, the user can edit the last symbols of the default name,
separated by the ":" symbol. To do this:
1. Set the cursor ">"on the name and click the encoder. The "*" symbol appears to indicate that name
edition is enabled.
2. Turn the controller to choose the character desired and 󽘀x it by pressing the button.
Character deletion is performed by choosing the "←" symbol and clicking.
3. Complete the editing of the name by choosing the "space" symbol and then click twice.
To con󽘀rm the preset saving, choose "Save" and click the rotary controller. The message "Save Done"
is shortly displayed on the screen. To return to the Preset Library, choose "Back" in the succeeding two
screens.
> MF3A : _Club__
Back
Save
SAVE USER PRESET
_
Figure 17. Saving user preset.
DSP SETTINGS > PRESET LIBRARY > PRESET INFORMATION
By pressing 3 seconds on the selected preset, a dialog shows up displaying various information about it.
In the latest 󽘀rmware version, the Name, Date, Version and Author are displayed and shall be used to
ensure that the speaker presets are up to date.
Figure 18. Preset information dialog.
> Back
MF3A : DLY Line U
Date: 20170629
Based-On: 0.6
Orig-Author: 02
PRESET INFORMATION

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DSP SETTINGS > LOWPASS FILTER
The DSP of the subwoofer also includes an adjustable Lowpass Filter and this submenu allows to change
its type, slope and cut-o󽗿 frequency, and to bypass it.
Figure 19. Low-pass Filter adjustment.
LOWPASS FILTER
> Back
Bypass: OFF
Freq: 120 Hz
Type: LR 24dB/Oct
The selection of the parameters is performed as explained for the Highpass Filter, and the options are:
- Bypass: On or O󽗿.
- Freq.: with 1 Hz steps, de󽘀nes the cut-o󽗿 frequency (-3 dB). The range available is from 80 Hz to 200 Hz.
- Type: - Butterworth 󽘀lters: BW 6 - 48 dB/Oct.
- Linkwitz-Riley 󽘀lters: LR 12, 24, 36 or 48 dB/Oct.
DSP Settings > Directivity
Turning the control knob in the Directivity menu, allows to select di󽗿erent directivity options, to modify
the radiation of the subwoofers. This function o󽗿ers three options:
- Normal: no process is applied and the subwoofer behaves as an omnidirectional source. For this
mode, no additional information is shown in the Active Preset Info screen.
- Cardioid: it implements speci󽘀c DSP processes to create a cardioid directivity pattern when used
properly in a subwoofer array. In this mode, the letters "CA" appear in the Active Preset Info screen.
- End-Fire: it enables end-󽘀re con󽘀guration by selecting a desired tuning frequency with the "Att. Freq"
parameter. This factor ranges from 40 Hz to 100 Hz, in 1 Hz steps.
By changing the attenuation frequency, the screen shows the distance it must be between the front
grilles of the subwoofers to get the e󽗿ect. Finally, when this mode is implemented, the Active Preset
Info screen shows the letters "EF".
DIRECTIVITY
Back
Type: End-Fire
> Att. Freq: 69 Hz
Sub Dist: 1.24 m
Figure 20. Example of an end-󽘀re setup in the Directivity menu.
Find more about subwoofer arrays in the Applications section.
DSP SETTINGS > PHASE INVERSION
PHASE INVERSION
Back
> Normal +
Inverted
Figure 21. Phase Inversion menu.
The Phase Inversion submenu switches the phase of the signal. In other words, it allows to invert or
"reverse" its polarity. Two settings are available:
- Normal: In phase setting.
- Inverted: The phase/polarity is inverted by introducing a 180° phase shift for all frequencies.
DSP SETTINGS > EQUALIZERS (EQ1 TO EQ5)
For system tuning purposes, 5 user-adjustable equalizers are available with the following parameters:
- Bypass: On (the EQ is bypassed) or O󽗿 (the EQ is active).
- Type: Low Shelf, Parametric or High Shelf.
- Gain: -12 to 12 dB, with 0.1 dB steps.
- Freq: 20 Hz to 1kHz, 1 Hz steps. Sets the center frequency for Parametric 󽘀lters, or the edge frequency
for Shelf 󽘀lters.
- Slope: 0.5 to 2, with steps of 0.1. Only for Shelf 󽘀lters.
- Quality: 0.01 to 16 with steps of 0.01, where higher Quality Factor values mean narrower bandwidth.
Only for Parametric 󽘀lters.
An example of a parametric equalizer with EQ1 in parametric mode is shown below.
Figure 22. Equalizer menu.
EQ1
Back
Bypass: ON
Type: Parametric
> Gain: 6 dB
Freq: 60 Hz
Quality: 1.00
To modify equalizer parameters, follow the same steps detailed in the Lowpass Filter section. Notice that
the equalizers can be individually bypassed, their default setting.

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DSP SETTINGS > BYPASS USER EQ
In order compare the response of the subwoofer with and without the applied EQ, this section allows to
bypass all user EQs with a single click.
BYPASS USER EQ
Back
Bypass al l +
Enable al l
Figure 23. Bypass User EQ menu.
Remember that user EQs are bypassed by default and can be activated individually.
DSP SETTINGS > DELAY
The Delay section allows the user to apply a delay to the signal, visualise it in di󽗿erent units and
determine the total delay. This screen has the following three sections:
- User added delay: This is the delay de󽘀ned or added by the user depending on the speci󽘀c needs
of his application.
- Preset delay: Depending on the preset enabled or selected, the system may include an additional
delay. This delay is added by the current preset and for some factory presets, it can be also edited.
- Total DSP delay: Total sum of "User", "Preset" and internal DSP latency. It is not an editable
parameter and is only shown for information and reference.
The "User" and "Preset" delays can be de󽘀ned in three di󽗿erent units, corresponding to the editable
parameters in the 󽘀rst two delay sections:
- Samples: for 48 kHz sampling rate.
- Time: Delay in milliseconds (ms), referred to the 48 kHz sampling rate.
- Distance: Delay in meters (m), referred to c = 343 m/s.
When changing a parameter in any section, all the other parameters are updated with the corresponding
value in their units.
Figure 24. Delay menu.
DELAY
Back
User added delay:
> Bypass: OFF
Samples: 0
Time: 0.00 ms
Distance: 0.00 m
Preset delay:
Bypass: OFF:
Samples: 10
Time: 0.21 ms
Distance: 0.07 m
Total DSP delay:
Samples: 63
Time: 1.31 ms
Distance: 0.45 m
The minimum "User" delay available for the B 15A subwoofer is 1,297 samples, that corresponds to
27 ms and approximately 9.3 meters of propagation delay. Depending on the factory preset selected,
the maximum available is 1,380 samples, equivalent to 28.8 ms and 9.9 meters.
DSP SETTINGS > RESET USER PARAMS
The Reset User Params submenu allows to reset user DSP settings such as:
- High-pass 󽘀lter
- Low-pass 󽘀lter
- Equalizers
- Delay
- Phase Inversion
- Bypass user EQ
The Output Gain, Input Sensitivity and the Preset selected are not a󽗿ected by this function.
Reset User
Parameters?
(DLY, EQ, Filter, PHA))
Back
> Reset
Figure 25. Reset user parameters menu.
By turning the controller the options "Reset" or "Back" will appear. By choosing the 󽘀rst one, the message
"Reset Done" is shortly displayed on the screen. To return to the DSP Settings, choose "Back".

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DSP SETTINGS > INPUT SENSITIVITY
Since the B 15A is an all-purpose subwoofer, its sensitivity can be adjusted by the user in order to match it
properly with the system chosen to use with. The screen shows the di󽗿erent sensitivities available in dBu
or dBV, and their corresponding values in volts.
INPUT SENSITIVITY
> Back
+14 dBu(3.88V)
+4 dBu(1.23V)
0 dBu(1.0V)
0 dBu(0.775V) +
-10 dBV(0.316V
Figure 26. Input sensitivity menu.
SYSTEM SETTINGS
The System Settings is the second submenu of the main MENU. It allows to set di󽗿erent parameters of
the ampli󽘀er and access various system functions.
SYSTEM SETTINGS
Back
> LCD Backlight
LCD Brightness
Reset
SW Information
Lock
Menu Timeouts
Exit
Figure 27. System Settings menu.
SYSTEM SETTINGS > LCD BACKLIGHT
The LCD Backlight submenu con󽘀gures the LCD screen's backlight settings. There are two general
choices:
- Auto O󽗿: Which will turn-o󽗿 the backlight after 6 seconds by default. To set a di󽗿erent value:
1. Set the cursor ">" on this option and click the encoder.
2. Turn the controller to choose a value between 1 and 60 seconds. Pressing the button will 󽘀x this
value and return the screen to the LCD Backlight submenu.
- Always On: Which sets the backlight to be always on.
Figure 28. LCD Backlight menu.
LCD BACKLIGHT
Back
> Auto Off
Always On +
SYSTEM SETTINGS > LCD BRIGHTNESS
The LCD Brightness screen enables to set the brightness of the LCD screen. To 󽘀x a value, follow the same
procedure stated for the LCD Backlight submenu.
LCD BRIGHTNESS
Back
> 9 [0-15]
Figure 29. LCD Brightness menu.
SYSTEM SETTINGS > RESET
The Reset function clears the current selections and sets the factory-default ones for the following settings:
- LCD Backlight settings
- LCD Brightness
- Lock settings
Figure 30. Reset menu.
RESET SYSTEM
SETTINGS?
> No (Back)
Yes

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SYSTEM SETTINGS > SW INFORMATION
This screen shows the most relevant information about the ampli󽘀er's 󽘀rmware, which can be important
not only for users but also for service technicians.
- MCU: Software version of the Micro Controller Unit.
- FW: Firmware version.
- Model: model of your SE AUDIOTECHNIK® product.
Figure 31. SW Information menu.
SW INFORMATION
Back
> MCU: 0.0.4.2
FW: 20190624
MODEL: S12 PRO
SYSTEM SETTINGS > LOCK
In the Lock menu, the user can set one of the following options for the screen locking function:
- Automatic Lock: This option will lock automatically the ampli󽘀er's screen after 10 seconds by
default. To set a di󽗿erent value, between 2 and 60 seconds, follow the same procedure described for
the LCD Backlight submenu.
- Lock Now: This option will lock the screen instantly. The selected settings for Automatic Lock or
No Lock, are kept.
- No Lock: This is the option set by default. It will disable the automatic lock function and make the
screen always accessible.
LOCK
Back
> Automatic Lock
Lock now
Never Lock
Figure 32.Screen Lock menu.
Remember that when the screen is locked, the "L" letter is shown in the top-right part of the Overview
screen. To unlock the ampli󽘀er, press the controller for 3 seconds until the message "Screen Unlocked!"
is shortly displayed on the screen. This message details the active preset as well.
SYSTEM SETTINGS > MENU TIMEOUTS
In the Menu Timeouts, the preferred behaviour of the main MENU can be con󽘀gured according with the
options:
- On, jumping out: After 󽘀ve minutes of inactivity, the display returns to the Overview screen.
- O󽗿, stay in menu: the display stays in the current menu inde󽘀nitely. This option is selected by default.
Figure 33. Menu Timeouts menu.
MENU TIMEOUTS
> Back
On, jumping out +
Off, stay in menu
FACTORY PRESETS
The B 15A self-powered subwoofer always has to be operated with one of the factory presets from the
Preset Library, which are the basis for the user presets. The presets available are:
Product Preset Name Description
M-F3A PRO MF3AP Default preset for systems comprising M-F3A PRO units.
M-F3A MF3A Default preset for systems comprising M-F3A units.
L 35 L35 Default preset for systems comprising L 35 units.
SMX 12A SMX12 Default preset when using SMX 12A monitor as PA unit.
GENERAL GENERAL General preset for use with other products systems.
If the preset library on your product di󽗿ers from the list shown above, please check your 󽘀rmware version
in the System Settings > SW Information menu and contact your dealer to update it.

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APPLICATIONS
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APPLICATIONS
The B-Line was developed as a family of general purpose subwoofers to provide freedom and versatility
when deploying full-range systems. Thanks to their 󽘁exibility, many di󽗿erent con󽘀gurations can be
implemented, both with other SE AUDIOTECHNIK® and with third-party products.
It is always recommended to simulate the system to use, in order to predict in advance its
behaviour under the expected and needed conditions.
In addition, measurements of the system should be performed once installed, to de󽘀ne
properly the crossover frequency between subwoofers and top units, and optimise the
󽘀nal response in the given environment.
STACKING SYSTEM
B 15A, B 15 and B 18 subwoofers can be safely and easily piled thanks to their two-point stacking system.
It includes the following elements:
- Top holes and bottom rubber feet: included to indicate the correct position, assuring a 󽘀rm grip and
a stable position.
- Side locking points: male lever on the top of the cabinet and the female receptacle on the bottom.
These must be manipulated as shown below:
1. Pull the handle to release the blocking piece.
2. Move the lever upwards to the receptacle of the unit above.
3. Release the handle to close the mechanism. Try to move the lever downwards to verify a close
and safe link.
For the sake of stability and thus safety, maximum three B-Line subwoofers can be stacked
together. Do not exceed these mechanical limits.
Stack
2
1
Snap
3
Figure 34. Linking system for stacks of B 15A, B 15 and B 18 subwoofers.

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SUBWOOFER ARRAYS
The wavelength of the frequencies reproduced by any subwoofer, are usually much larger than its physical
dimensions. Due to this, most of them have no control over directivity, and their radiation pattern in the
pass-band is omnidirectional. In order to improve this behaviour and to introduce some directivity in the
intended direction, gradient subwoofer setups are used. In addition, some of their main bene󽘀ts are:
1. Reduced low frequency SPL behind the subwoofers and thus, reduced overall SPL on the stage. This
helps to reduce low frequency bleed in the microphones and may improve the comfort, monitoring
and performing for the musicians.
2. Reduced re󽘁ections indoors for a more homogeneous sound 󽘀eld, as sound is more directed towards
the audience.
3. Reduced energy spill outside of the venue area, reducing noise towards the households and living
areas around.
From their design, the B-Line subwoofers include di󽗿erent features to optimise this phenomenon, getting
the best possible performance out of it. This is also re󽘁ected in the physical deployment of the setups,
reducing time and resources during their placement and wiring.
Two of the main types of gradient subwoofer setups are the "Cardioid" and the "End-Fire", detailed below.
END-FIRE SETUP
In end-󽘀re setups, two or more subwoofers are placed behind each other to introduce between them a
delay, which changes the interaction of the sound in the front and the rear sides, and reduces the level
in the desired direction. The cancellation of the rear sound occurs mainly around the centre or "tuning"
frequency of the setup.
Usually, end-󽘀re setups provide around 15 dB to 25 dB level reduction in the rear and are easy to set up.
Their main drawback however is the space requirement, which may be a problem in some applications.
That is why in most of the cases, the subwoofers are placed ¼ wavelength apart and the additional delay
of ¼ wavelength is introduced electronically.
Figure 35 illustrates an end-󽘀re setup with B 15 or B 15A subwoofers 1.25 m distant. For this distance, an
additional delay of approximately 3.64 ms should be added to the front subwoofer to create the highest
reduction in the rear around 69 Hz, over their main operating band.
In B 15A self-powered subwoofers, the Directivity function of the DSP allows to con󽘀gure this setup easily:
1. For the subwoofer placed in front of the line, enable "End-Fire" mode in the Directivity menu by
selecting the desired centre frequency of attenuation. Below in the screen, observe the distance
calculated for that frequency. This distance must match the real separation of the subwoofers from
grille to grille.
2. For the subwoofer placed rear, select the "Normal" preset in the Directivity menu.
The distance between subwoofers is calculated at reference room temperature 20 °C,
and taking the speed of sound c = 343 m/s.
All the additional processing like level, polarity, delay and EQ, should be done identically to
all subwoofers within the end-󽘀re setup, in order to maintain proper phase relations for
directivity control.
FRONT
(Audience)
1.25 m REAR
(stage)
Figure 35. End-󽘀re setup with two B 15A subwoofers centred at 69 Hz.

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For the passive subwoofers, the needed delay must be applied before in the signal chain, from the mixer,
an external processor or if possible, the ampli󽘀er itself. An advantage in this case, is the connection
󽘁exibility o󽗿ered by the subwoofers with the front connectors they include.
Figures 36 depicts an end-󽘀re made with two stacks of B 18 subwoofers and 󽘀gure 37 its related
connection scheme. Notice how the signal is provided with a single speakON® NL4 cable from the ampli󽘀er
and passed through each pair of subwoofers using link cables, simplifying the deployment of the whole
setup. Keep in mind that all the connections between subwoofers are done over pins 1+/1- of the
speakON® link cables.
FRONT
(Audience)
FRONT
(Audience)
1.7 m
REAR
(stage)
REAR
(stage)
speakON® NL4
from AMP
Figure 36. Front (top) and rear (bottom) views of and End-󽘀re setup of two B 18 stacks, centred at 50 Hz due to the 1.7 m distance between them.
Notice that no cables are seen from the front of the array.
Input/Link 1
Input/Link 2
Output Ch. 2
Input/Link 1
Input/Link 2
Output Ch. 2
Input/Link 1
Input/Link 2
Output Ch. 2
Input/Link 1
Input/Link 2
Output Ch. 2
speakON®
NL 4 cable 1+/1-
1+/1-
1+/1-
1+/1-
2+/2-
2-CHANNEL
AMPLIFIER
REAR SUB # 2 FRONT SUB # 2
REAR SUB # 1 FRONT SUB # 1
Figure 37. Connection scheme for end-󽘀re system shown in 󽘀gure 36.

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CARDIOID SETUP
Cardioid con󽘀gurations follow the same acoustical principles as end-󽘀re setups but deal with shorter
distances between the subwoofers. This can be an advantage in many applications where space is scarce
but, it implies also some compromises regarding front SPL.
A classic cardioid setup is achieved by combining three subwoofers in a ratio of 2:1. This means two
subwoofers facing front or towards the audience, and one subwoofer facing rear or towards the stage.
Figure 38 shows possible arrangements for these arrays.
The amount of rejection in the rear side of the subwoofer setup varies with frequency, and depends
strongly on the chosen arrangement and the acoustic environment. In half-space conditions such as
outdoors, a rear-rejection of 15 to 20 dB can be achieved. Also, the stacked arrangement has proven
to be the most e󽗿ective.
Compared to a single subwoofer usage, the response of a cardioid arrangement exhibits an
increase in the level of the highest frequencies of the subwoofer's range. If desired, and in order
to retrieve a 󽘁at spectrum, a parametric EQ around 85 Hz with a Q3 and gain of at least -3 dB
should be used equally on all the subwoofers of the array.
As explained before, the Directivity function in B 15A self-powered subwoofers highly simpli󽘀es this
process. To do it, just:
1. Select the "Normal" mode in the Directivity menu of the subwoofers facing front.
2. Select the "Cardioid" mode in the Directivity menu of the subwoofer facing rear.
All the additional processing like level, delay and EQ, should be done identically to all
subwoofers within the cardioid setup, in order to maintain proper phase relations for
directivity control.
Conversely, in cardioid setups comprising passive models of the B-Line, the required delay must be
applied before in the signal path. Also, their internal circuitry simpli󽘀es the connections, as shown in
󽘀gures 39 and 40: notice that only one speakON® NL4 cable is needed between the ampli󽘀er and the
subwoofers, where the signal is shared and passed through pins 1+/1- of the speakON® link cables.
In addition, notice that all the connections can be made only from the rear of the arrangement,
improving the appearance of these deployments.
Figure 38. Horizontal and vertically stacked con󽘀gurations for cardioid setups.
FRONT
(Audience)
FRONT
(Audience)
REAR
(stage)
REAR
(stage)