d & b audiotechnik 24S User manual

xS 24S/24S-D
Manual 1.1 en

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General information
24S/24S-D Manual
Version: 1.1 en, 10/2016, D2624.EN .01
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.
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. 24S/24S-D loudspeaker................................................ 5
2.1. Product description.................................................................. 5
2.2. Connections............................................................................. 5
2.3. Operation................................................................................ 7
2.3.1. Controller settings................................................................ 7
2.4. Dispersion characteristics........................................................ 8
2.5. Technical specifications........................................................ 10
3. Manufacturer's declarations..................................... 12
3.1. EU conformity of loudspeakers (CE symbol)....................... 12
3.1.1. WEEE Declaration (Disposal)........................................... 12
Contents
d&b 24S/24S-D Manual 1.1 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 24S/24S-D Manual 1.1 en4

2.1. Product description
The 24S and 24S-D are high performance 2-way loudspeakers
employing two 12" neodymium LF driver in a bass-reflex enclosure
and different HF sections for a wide range of installed sound
applications. Both models are lightweight passive designs using a
1.4" exit neodymium driver and large horns for accurate pattern
control. They provide rotatable dispersion characteristics of (h x v)
75° x 45° (24S) or 110° x 45° (24S-D).
The two 12" LF drivers are positioned in a dipolar arrangement
providing exceptional vertical dispersion control even at lower
frequencies.
Specially designed ports with optimized flow characteristics
provide a considerably improved, efficient low frequency
reproduction.
With a frequency response extending from 55 Hz to above
18 kHz, the cabinets can be used as full range systems or
supplemented by different subwoofers of the xS- or xA-Series.
The enclosures are constructed from marine plywood with an
impact resistant paint finish. The fronts of the cabinets are protected
by a rigid metal grill backed by an acoustically transparent foam.
The cabinets are Ball Impact Resistant according to DIN 18032-3.
Cabinet options
The weather resistant version (WR) is suitable for outdoor use
(IP34, vertical aiming up to +15°). The cabinets have an impact
and weather protected black PCP (Polyurea Cabinet Protection)
finish.
Rigging components
The top, bottom, side and rear panels of the cabinets are each
equipped with a pair of M10 threaded inserts to connect to
different rigging accessories such as:
– Z5553 Flying bracket 24S
– Z5554 Horizontal bracket 24S
– Z5384 VP Flying adapter
– Z5551 VP Flying adapter link
2.2. Connections
The cabinets are fitted with an NL4 M connector using the pin
assignment 1+/1– and a two pole screw terminal block (ST).
Cabinets with the weather resistant option (WR) are equipped with
a fixed input cable (PG type, H07-RN-F, 2 x 2.5 mm2 (AWG 13),
standard length 5.5 m (18 ft).
Pin equivalents of the applicable connector options are listed in the
table below.
NL4 M 1+ 1– 2+ (n.c.) 2– (n.c.)
ST + – n.a. n.a.
PG Brown (+) Blue (–) n.a. n.a.
24S/24S-D loudspeaker
Rigging examples:
24S/24S-D flown with Z5553 Flying bracket 24S.
24S/24S-D ceiling mounted with Z5554 Horizontal bracket 24S.
24S/24S-D array with Z5384 VP Flying adapter/Z5551 VP Flying adapter link.
passive
crossover
2. 24S/24S-D loudspeaker
d&b 24S/24S-D Manual 1.1 en 5

Fixed cable connection
The 24S and 24S-D loudspeakers are each supplied with a cover
plate [1] and a rubber grommet feed through [2]. For indoor
operation, these items can be used to hide the connector panel, if
required. For unprotected outdoor operation, the connector panel
must be covered, i.e. both items must be used to achieve an IP
degree of protection of IP34.
To install the fixed cable connection, proceed as follows:
Tools required: Philips screw driver (#PH2).
1. Remove the knockout opening in the cover plate [1] and
attach the rubber grommet [2] correspondingly.
2. Insert the connection cable through the rubber grommet.
3. Undo the four screws of the connector panel.
4. Connect the cable wires to the screw terminal.
Þ Observe the correct polarity!
5. Push the cover plate towards the connector panel until it fits
into place.
6. Finally fix the cover plate together with the connector panel
using all screws.
Step 2 Step 3 Step 4/5 Step 6
Installing the fixed cable connection
Cover plate and rubber grommet
Step 1
d&b 24S/24S-D Manual 1.1 en6

NL4 connection with cover plate
The NL4 connector socket of the cabinet's connector panel is
located in a recess to allow the use of the cover plate [1] together
with an NL4 cable connector, as shown in the graphic opposite.
Note: Neutrik NL4FC type connectors must be used for this
option.
To use the NL4 connection, proceed in the same manner as
described in the previous section.
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:
30D/D20/D80.
Application Setup Cabinets per
channel
24S 24S 1
24S-D 24S-D 1
For applicable d&b amplifiers, the controller setups are available
in Dual Channel and/or Mix TOP/SUB mode.
2.3.1. Controller settings
For acoustic adjustment the functions CUT, HFA and CPL can be
selected.
CUT mode
Set to CUT, the low frequency level is reduced. The cabinets are
now configured for use with actively driven d&b subwoofers.
HFA mode
In HFA mode (High Frequency Attenuation), the HF response of the
system is rolled off. HFA provides a natural, balanced frequency
response when a cabinet is placed close to listeners in near field or
delay use.
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll off mimics the decline
in frequency response experienced when listening to a system from
a distance in a typically reverberant room or auditorium.
NL4 cable connection with cover plate [1]
-5
0
5
10
-10
-15
-20
-25
-30
20 100 1k 10k 20k
Frequency response correction in HFA mode
d&b 24S/24S-D Manual 1.1 en 7

CPL function
The CPL (Coupling) function compensates for coupling effects
between the cabinet and close boundary surfaces. CPL begins
gradually around 1 kHz, with the maximum attenuation below
400 Hz. To achieve a balanced frequency response, the CPL
function can be set to dB attenuation values between 0 and –9.
Positive CPL values create an adjustable low frequency boost (0 to
+5 dB) at around 65 Hz and can be set when the system is used in
full range mode without subwoofers.
2.4. Dispersion characteristics
The following graphs show dispersion angle over frequency of a
single cabinet plotted using lines of equal sound pressure (isobars)
at –6 dB and –12 dB.
Isobar diagram horizontal
24S
vertical setup
Isobar diagram vertical
Isobar diagram horizontal
24S
horizontal setup,
horn rotated
Isobar diagram vertical
Frequency response correction of the CPL function
d&b 24S/24S-D Manual 1.1 en8

Isobar diagram horizontal
24S-D
vertical setup
Isobar diagram vertical
Isobar diagram horizontal
24S-D
horizontal setup,
horn rotated
Isobar diagram vertical
Altering the HF horn dispersion
By factory default, the HF horn is fitted to the cabinet providing the
nominal horizontal dispersion when the cabinet is used in upright
position. This is indicated by a white label on the horn flange. The
label is visible through the front grill on each side of the cabinet as
shown in the graphic opposite.
The HF horn can be rotated through 90°.
Tools required: Torx wrench (#TX20).
1. Undo the torx screws on the top and bottom panels of the
cabinet and remove the front grill.
2. Undo the screws holding the horn flange and rotate the horn.
3. Refit the horn as follows:
– Make sure the gasket of the horn is in place.
– Refit the horn.
– Insert all screws and carefully tighten them clockwise until
they fit precisely into the countersunk holes.
4. Refit the front grill.
Altering the HF dispersion
d&b 24S/24S-D Manual 1.1 en 9

2.5. Technical specifications
24S/24S-D system data
Frequency response (–5 dB standard) 55 Hz - 18 kHz
Frequency response (–5 dB CUT mode) 90 Hz - 18 kHz
Max. sound pressure (1 m, free field)
24S with 30D/D20 138 dB
24S with D80 138 dB
24S-D with 30D/D20 137 dB
24S-D with D80 137 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
24S/24S-D loudspeaker
Nominal impedance 4 ohms
Power handling capacity (RMS/peak 10 ms) 500/2000 W
Nominal dispersion angle (horizontal) 24S 75°
Nominal dispersion angle (horizontal) 24S-D 110°
Nominal dispersion angle (vertical) 45°
Components 2 x 12" driver with neodymium magnet
1.4 ” exit compression driver
Passive crossover network
Connections 1 x NL4 M
1 x screw terminal (ST - up to 4 mm2/AWG 11)
Optional fixed
cable (PG) H07-RN-F, 2 x 2.5 mm2 (AWG 13), 5.5 m (18 ft)
Pin assignment NL4 M: 1+/1–
Fixed cable (PG): Brown: (+) / Blue: (–)
Weight 33 kg (73 lb)
24S frequency response, standard and CUT modes
24S-D frequency response, standard and CUT modes
d&b 24S/24S-D Manual 1.1 en10

24S/24S-D cabinet dimensions in mm [inch]
d&b 24S/24S-D Manual 1.1 en 11

3.1. EU conformity of loudspeakers (CE symbol)
This declaration applies to:
d&b 24S loudspeaker, Z1610
d&b 24S-D loudspeaker, Z1611
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 24S/24S-D Manual 1.1 en12

D2624.EN .01, 10/2016 © d&b audiotechnik GmbH
www.dbaudio.com