d & b audiotechnik J-INFRA User manual

JJ-INFRA
Manual 2.2 en

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General information
J-INFRA Manual
Version: 2.2 en, 03/2016, D2984.EN .02
Copyright © 2016 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-INFRA 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-INFRA Manual 2.2 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-INFRA Manual 2.2 en4

2.1. Product description
The J-INFRA is the cardioid infra subwoofer for the J-Series. It can
be used to supplement J-Series systems consisting of J8, J12 and
J-SUB cabinets in various combinations. It extends the frequency
response of a J-Series system down to 27 Hz
J-INFRA cabinets can be used ground stacked in a conventional
L/R setup as well as arranged in a subwoofer array. One J-INFRA
cabinet provides additional very low frequency energy for two
J-SUBs.
The J-INFRA cabinet is an actively driven 2-way bass-reflex design
housing three long excursion neodymium 21“ 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. J-INFRA cabinets have to be arrayed with a minimum
distance of 60 cm (2 ft) between adjacent cabinets.
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. Two
runners extend from the rear to the front panel of the cabinet
protecting the bottom panel against scratching.
Two correspondingly shaped recesses are incorporated in the top
panel of each cabinet to accept these runners and prevent cabinet
movement when stacking J-INFRAs. The cabinet front is fitted with
four catches for securing the optional transport lid E7920.
2. J-INFRA loudspeaker
d&b J-INFRA Manual 2.2 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.
Applicable d&b amplifiers:
D80/D12/30D.
Application Setup Cabinets per
pair of amplifier
channels
J-INFRA J-INFRA 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-INFRA cabinet.
2
Se n se D ri v e
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-INFRA Manual 2.2 en6

The two channels are tuned to create a cardioid dispersion pattern
thus providing maximum rejection to the rear.
2.3.1. Controller settings
When J-INFRA cabinets are placed close to J-SUB cabinets the
standard mode is selected.
For acoustic adjustment the 70 Hz and HCD function can be
selected.
70 circuit
When J-INFRA cabinets are located remotely from J-SUB cabinets
there is less coupling between the systems. Selecting the 70 Hz
circuit compensates for this effect by extending the upper
frequency limit to 70 Hz.
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-INFRA Manual 2.2 en 7

2.4. Technical specifications
J-INFRA system data
Frequency response (–5 dB standard) 27 Hz - 60 Hz
Frequency response (–5 dB 70 Hz mode) 27 Hz - 70 Hz
Max. sound pressure (1 m, free field)
with D12/30D 141 dB
with D80 144 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
J-INFRA loudspeaker
Nominal impedance Front/Rear 3/6 ohms
Power handling capacity Front (RMS/peak 10 ms) 1200/4800 W
Power handling capacity Rear (RMS/peak 10 ms) 600/1200 W
Components 3 x 21" 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 152 kg (335 lb)
J-INFRA cabinet dimensions in mm [inch]
J-INFRA frequency response, standard and 70 Hz mode
d&b J-INFRA Manual 2.2 en8

3.1. EU conformity of loudspeakers (CE symbol)
This declaration applies to:
d&b J-INFRA loudspeaker, Z1000
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-INFRA Manual 2.2 en 9

D2984.EN .02, 03/2016 © d&b audiotechnik GmbH
www.dbaudio.com