d & b audiotechnik J-SUB User manual

JJ-SUB
Manual 2.1 en

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General information
J-SUB Manual
Version: 2.1 en, 09/2015, D2982.EN .02
Copyright © 2015 by d&b audiotechnik GmbH; all rights
reserved.
Keep this manual with the product or in a safe place
so that it is available for future reference.
When reselling this product, hand over this manual to the new
owner.
If you supply d&b products, please draw the attention of your
customers to this manual. Enclose the relevant manuals with the
systems. If you require additional manuals for this purpose, you
can order them from d&b.
d&b audiotechnik GmbH
Eugen-Adolff-Strasse 134, D-71522 Backnang, Germany
T [phone], F [phone]
[email protected], www.dbaudio.com

1. Safety precautions........................................................... 4
1.1. Information regarding the use of loudspeakers.................... 4
2. J-SUB loudspeaker.......................................................... 5
2.1. Product description.................................................................. 5
2.2. Connections............................................................................. 6
2.3. Operation................................................................................ 6
2.3.1. Controller settings................................................................ 7
2.4. Technical specifications.......................................................... 8
3. Manufacturer's declarations....................................... 9
3.1. EU conformity of loudspeakers (CE symbol)......................... 9
3.1.1. WEEE Declaration (Disposal)............................................. 9
Contents
d&b J-SUB Manual 2.1 en 3

1.1. Information regarding the use of loudspeakers
Potential risk of personal injury
Never stand in the immediate vicinity of loudspeakers driven at a
high level. Professional loudspeaker systems are capable of
causing a sound pressure level detrimental to human health.
Seemingly non-critical sound levels (from approx. 95 dB SPL) can
cause hearing damage if people are exposed to it over a long
period.
In order to prevent accidents when deploying loudspeakers on the
ground or when flown, please take note of the following:
– When setting up the loudspeakers or loudspeaker stands,
make sure they are standing on a firm surface. If you place
several systems on top of one another, use straps to secure
them against movement.
– Only use accessories which have been tested and approved
by d&b for assembly and mobile deployment. Pay attention to
the correct application and maximum load capacity of the
accessories as detailed in our specific "Mounting instructions"
or in our "Flying system and Rigging manuals".
– Ensure that all additional hardware, fixings and fasteners used
for installation or mobile deployment are of an appropriate
size and load safety factor. Pay attention to the manufacturers'
instructions and to the relevant safety guidelines.
– Regularly check the loudspeaker housings and accessories for
visible signs of wear and tear, and replace them when
necessary.
– Regularly check all load bearing bolts in the mounting devices.
Potential risk of material damage
Loudspeakers produce a static magnetic field even if they are not
connected or are not in use. Therefore make sure when erecting
and transporting loudspeakers that they are nowhere near
equipment and objects which may be impaired or damaged by an
external magnetic field. Generally speaking, a distance of 0.5 m
(1.5 ft) from magnetic data carriers (floppy disks, audio and video
tapes, bank cards, etc.) is sufficient; a distance of more than 1 m
(3 ft) may be necessary with computer and video monitors.
1. Safety precautions
d&b J-SUB Manual 2.1 en4

2.1. Product description
The J-SUB is the cardioid subwoofer for the J-Series. It can be used
to supplement J8 and J12 cabinets in various combinations, either
flown or ground stacked. When the J Flying Frame is used J-SUB
cabinets can be flown in columns of up to 16 cabinets or inserted
on top of a J8/J12 line array column.
The J-SUB cabinet is an actively driven 2-way bass-reflex design
housing three long excursion neodymium 18“ drivers, two drivers
face to the front while one driver radiates to the rear of the cabinet.
Front and rear drivers are driven by separate amplifier channels
and operate in independent bass reflex chambers. Through its
cardioid dispersion pattern this setup avoids unwanted energy
behind the system and greatly reduces the reverberant field at low
frequencies providing highest accuracy in low frequency
reproduction.
Its frequency response extends from 32 Hz to 100 Hz.
The cabinet is constructed from marine plywood and has an impact
and weather protected PCP (Polyurea Cabinet Protection) finish.
The front and rear of the loudspeaker cabinet are protected by a
rigid metal grill. Each side panel incorporates four handles and
mounted on the rear panel are four heavy duty wheels.
J-Series rigging components and arrays
Cabinets are mechanically connected using the rigging strands at
both sides of the cabinet front and a central strand at the rear of
the cabinet. All necessary rigging components are mounted to the
cabinet and folded or slid out when needed.
A detailed description of the J-Series rigging components is given
in the J-Series Rigging manual which is provided with the J Flying
frame.
A detailed description of planning and designing J arrays is given
in the technical information "TI 385 d&b Line array design,
ArrayCalc" which is also provided with the J Flying frame.
The d&b ArrayCalc simulation software can be downloaded from
the d&b website at www.dbaudio.com.
2. J-SUB loudspeaker
d&b J-SUB Manual 2.1 en 5

2.2. Connections
The cabinet is fitted with a single NLT4 F connector. It uses the pin
assignments 1+/1– for the front drivers. Pins 2+/2– drive the rear
driver.
The cabinets can be supplied with EP5 or NL8 connectors as an
option.
Pin equivalents of the connector options are listed in the table
below.
LF +
Front
LF –
Front
LF +
Rear
LF –
Rear
SenseDrive
(SD)
NLT4 F 1+ 1– 2+ 2– n.a.
EP5 1 2 3 4 5
NL8 1+ 1– 4+ 4– 3–
d&b SenseDrive
The SenseDrive feature within D12 amplifiers enables electrical
compensation for the properties of the loudspeaker cable used.
SenseDrive requires an additional sense wire. SenseDrive is
therefore only available with EP5 connectors and 5-wire cabling
for applicable loudspeakers.
Note: To enable SenseDrive for the front drivers the
loudspeaker cabinet has to be connected to output A.
d&b LoadMatch
Starting with the D80 amplifier platform, the LoadMatch function
enables the amplifier to electrically compensate for the properties
of the loudspeaker cable used without the need for an additional
sense wire. For applicable loudspeakers, LoadMatch is therefore
independent of the connector type used.
2.3. Operation
NOTICE!
Only operate d&b loudspeakers with a correctly configured d&b
amplifier, otherwise there is a risk of damaging the loudspeaker
components.
Application Setup
Cabinets per
pair of amplifier
channels
J-SUB J-SUB 1
For applicable d&b amplifiers, the controller setup is available in
2-Way Active mode. Each pair of amplifier output channels drives
a single J-SUB cabinet.
2
Se nse D ri ve
3
4
5
NLT4 F and EP5 connector wiring
INPUT A OUT A
2-Way
SenseDrive
OUT B
2-Way
AMP B
AMP A
D12 Input/Output routing 2-Way Active mode
d&b J-SUB Manual 2.1 en6

In its standard mode the J-SUB can be used as subwoofer for
applicable d&b loudspeaker systems operated in CUT mode. In
this mode the two channels of the system are tuned to create a
cardioid dispersion pattern thus providing maximum rejection to the
rear. It can be used in flown or stacked combinations with a
minimum distance of 60 cm (2 ft) between adjacent columns of
cabinets.
2.3.1. Controller settings
For acoustic adjustment the INFRA and HCD function can be
selected.
INFRA circuit
If the INFRA circuit is selected, the upper operating frequency of
the system is reduced from 100 Hz to 70 Hz. The J-SUB can now
be used to supplement applicable d&b loudspeaker systems
operated in full range mode.
HCD circuit
Cardioid polar pattern
Hypercardioid polar pattern
Selecting HCD (Hypercardioid) optimizes the tuning of front and
rear channels for a maximum rejection at the left and right sides
behind the cabinet providing a hypercardioid dispersion pattern.
This characteristic is particularly useful for a setup with subwoofers
stacked at the left and right sides of a stage providing minimum
interference onstage.
HCD mode can be used either freely radiating or in front of walls.
The minimum distance to rear walls is provided by the wheels on
the cabinet back. Even in HCD mode adjacent columns of J-SUBs
have to be at least 60 cm (2 ft) apart.
d&b J-SUB Manual 2.1 en 7

2.4. Technical specifications
J-SUB system data
Frequency response (–5 dB standard) 32 Hz - 100 Hz
Frequency response (–5 dB INFRA Hz mode) 70 Hz - 100 Hz
Max. sound pressure (1 m, free field)
with D12/30D 138 dB
with D80 139 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
J-SUB loudspeaker
Nominal impedance Front/Rear 4/8 ohms
Power handling capacity Front (RMS/peak 10 ms) 800/3200 W
Power handling capacity Rear (RMS/peak 10 ms) 400/1600 W
Components 3 x 18" driver
Connections 1 x NLT4 F
optional 1 x EP5or NL8
Pin assignment
NLT4 F/M: 1+: Front+/ 1–: Front– / 2+: Rear+/ 2–: Rear–
EP5: 1: Front+/2: Front–/ 3: Rear+/4: Rear–/ 5: SD Front
NL8: 1+: Front+/1–: Front–/ 4+: Rear+/4–: Rear–/ 3–: SD Front
Weight 106 kg (234 lb)
J-SUB cabinet dimensions in mm [inch]
J-SUB frequency response, standard and INFRA Hz mode
d&b J-SUB Manual 2.1 en8

3.1. EU conformity of loudspeakers (CE symbol)
This declaration applies to:
d&b J-SUB loudspeaker, Z0660
manufactured by d&b audiotechnik GmbH.
All production versions of these types are included, provided they
correspond to the original technical version and have not been
subject to any later design or electromechanical modifications.
We herewith declare that said products are in conformity with the
provisions of the respective EC directives including all applicable
amendments.
A detailed declaration is available on request and can be ordered
from d&b or downloaded from the d&b website at
www.dbaudio.com.
3.1.1. WEEE Declaration (Disposal)
Electrical and electronic equipment must be disposed of separately
from normal waste at the end of its operational lifetime.
Please dispose of this product according to the respective national
regulations or contractual agreements. If there are any further
questions concerning the disposal of this product, please contact
d&b audiotechnik.
3. Manufacturer's declarations
d&b J-SUB Manual 2.1 en 9

D2982.EN .02, 09/2015 © d&b audiotechnik GmbH
www.dbaudio.com