Welcome to Dynaudio 18S
Active DSP Subwoofer
This is
8 Important safety instructions
10 Getting to know the 18S
12 Unpacking
14 Disposal
Carton contents
16 Installation
16 Positioning
Mains and signal connections
Subwoofer connections
22 Control and configuration
Subwoofer controls
26 In use
Dear music lover
Welcome to Dynaudio 18S active DSP subwoofer. The 18S is a very high
performance product that rewards thoughtful setup and installation so we
suggest that you take a little time to read this manual before you begin.
Important safety instructions
1.Read these instructions.
2.Keep these instructions.
3.Heed all warnings.
4.Follow all instructions.
5.Do not use this apparatus near
6.Clean only with dry cloth.
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
amplifiers) that produce heat.
9.Do not defeat the safety purpose
of the polarized or grounding-type
plug. A polarized plug has two
blades with one wider than the
other. A grounding type plug has
two blades and a third grounding
prong. The wide blade or the third
prong are provided for your safety.
If the provided plug does not fit 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
11.Only use attachments/accessories
specified by the manufacturer.
12.Use only with the cart, stand,
tripod, bracket, or table specified
by the manufacturer, or sold with
the apparatus. When a cart is used
use caution when moving the cart/
apparatus combination to avoid
injury from tip-over.
13.Unplug this apparatus during
lightning storms or when unused for
long periods of time.
14.Refer all servicing to qualified service
personnel. Servicing is required
when the apparatus has been
damaged in any way, such as powersupply 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.
15.WARNING: To reduce the risk of
fire or electric shock, this apparatus
should not be exposed to rain or
moisture and objects filled with
liquids, such as vases, should not be
placed on this apparatus.
16.To completely disconnect this
equipment from the mains,
disconnect the power supply cord
plug from the receptacle. The mains
plug of the power supply cord shall
remain readily operable.
This symbol is intended to alert the user to the presence
of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
Risk of electric shock. Do not open.
To reduce the risk of electric shock, do
not remove the rear panel and do not
expose the apparatus to rain or moisture.
No user serviceable parts inside. Refer
servicing to qualified personnel.
This symbol is intended to alert the user to the presence
of uninsulated “dangerous voltage” within the product’s
enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
Getting to know the 18S
Getting to know the 18S
The Dynaudio 18S is a DSP controlled
active subwoofer intended to augment the
bass performance of full range monitors
in near-field or mid-field monitoring
The 18S features a closed box acoustic
system and incorporates dual opposed
24cm drivers to minimise mechanical
Connection facilities include balanced XLR
and unbalanced stereo inputs with output
sockets provided to enable the connection
of active monitors, a power amplifier for
passive monitors, or a second subwoofer.
The 18S incorporates low-pass filter
presets configured to match a range of
Dynaudio monitor models, three bands of
parametric equalisation, and an adjustable
low pass filter that can be configured
for use with monitors from alternative
18S configuration and control is
accomplished through a rear panel
mounted display combined with a rotary
1. O
pen the carton from the top and
remove the subwoofer accessories.
Do not remove the upper element of
the internal packaging.
2. Carefully rotate the carton on to its
side and again to turn it upsidedown.
3. The carton can now be lifted away
from the subwoofer. Remove the
lower internal packaging now on
top to reveal the underside of the
4. O
pen the plastic bag and remove
it from around the base of the
5. Carefully rotate the subwoofer on to
its side and again to turn it onto its
feet. The internal packaging can now
be removed followed by the plastic
After unpacking, make sure the
components are complete and check
the subwoofer and all accessories for
transport damage. Transport damage
may be expected if the packaging is
severely marked. Do not attempt to
install the subwoofer if it is damaged. If
the contents are incomplete or damaged,
please contact your Dynaudio retailer or
local distributor. Distributor addresses
can be found at: www.dynaudio.com.
Packaging material
The packaging has been designed
so that it may be reused if it was not
damaged during initial transport. Keep
the packaging and use it for all further
The 18S is heavy and is best
unpacked close to its installed
location by two people working
Disposal of used electrical and electronic
equipment (applicable in European
countries with separate collection
systems for this equipment).
This symbol on the product or its
packaging indicates that the product
may not be treated as household waste.
Instead it must be handed over to
the applicable collection point for the
recycling of electrical and electronic
equipment. By ensuring this product
Carton contents
is disposed of correctly, you will help
prevent potential negative consequences
for the environment and human health.
The recycling of materials helps to
conserve natural resources. For more
detailed information on recycling this
product, please contact your local
authority, community waste disposal of,
or the shop where you purchased the
•1 x Dynaudio 18S active
DSP subwoofer.
•1 x Mains power cable
•1 x Document pack
Subwoofer distance
The position of subwoofers in studio
rooms is generally less critical compared
to full-range monitors. However, best
results will most likely be obtained if
your 18S is placed between the left and
right monitors or in the vicinity of one of
them. If this is not practical, a subwoofer
position to the side of the left or right
monitor, or against a side wall can also
provide good results.
Placing a subwoofer close to or behind
or the listening position, even in multichannel surround sound installations,
generally results in inferior performance,
especially in terms of stereo imaging.
Two subwoofers used in a
single installation can improve
performance by maintaining low
frequency stereo separation and
effectively averaging the effects of
low frequency room resonances.
Moving the subwoofer closer to walls
and corners will generally increase the
amount of bass. Although the extra
amount of bass can be compensated
for by reducing the volume level of
the subwoofer relative to the rest of
the system, this can result in uneven
bass response at the listening position.
Experiment with the position of your
18S to find one which yields the best
compromise between convenience,
volume and even bass response.
Every studio room will have
“room-modes”, where at specific
locations and frequencies,
the bass may be under or
overemphasised. This effect is
likely to be stronger in square
and rectangular shaped rooms.
Experimenting with the position
of the subwoofer is likely to reap
benefits in terms of minimising
room modes.
The 18S incorporates signal processing
that can compensate for the time delay
and volume level differences between
the subwoofer and monitors resulting
from their relative positions with respect
to the listening position. Once you have
positioned your subwoofer, measure the
distances as illustrated. The measured
distances should then be specified at the
appropriate locations in the subwoofer
configuration menu. The configuration
menu is described in Section 3 of this
Left monitor
Right monitor
Listening position
The 18S signal processing is able
to compensate for a maximum
of 5.35m difference between
subwoofer and monitor distances
to the listening position.
Mains and signal connections
Subwoofer connections
The 18S is fitted on its rear face with a
connection and control panel carrying
mains, signal and connection sockets.
The panel is illustrated in Diagram 3 and
its connection facilities are described in
the following paragraphs.
2. B
alanced XLR input sockets
(left and right). If your monitoring
hardware provides balanced outputs
connect them to these sockets using
high quality balanced XLR audio
1. M
ains power socket. Connect the
subwoofer to a mains power supply
using the cable supplied. If multiple
cables are supplied with your
subwoofer, use the one appropriate
for your territory.
3. B
alanced XLR output sockets
(left and right). The XLR output
sockets are intended for the
connection of active left and right
monitors, a power amplifier driving
passive monitors, or a second
Do not switch on your subwoofer
until all other connections have
been made.
The 18S distance compensation
signal processing can only
function correctly if the monitors
are driven via the subwoofer
4. U
nbalanced phono input sockets
(left and right). If your monitoring
hardware provides unbalanced
phono outputs connect them to
these sockets using high quality
phono audio cables.
If your audio source provides only
a mono subwoofer output it can
be connected to either 18S phono
input. In this case however the
main speakers must be driven
from the audio source and not via
the 18S outputs.
5. U
nbalanced phono output
sockets (left and right). The phono
output sockets are intended for the
connection of active left and right
monitors, a power amplifier driving
passive monitors, or a second
6. T
rigger input. The trigger input
enables wired remote control of
subwoofer standby and operational
modes in automated systems. Your
Dynaudio retailer or installer will be
able to provide more information
on the use of the 18S in automation
The USB socket present on the
18S connection panel is intended
for fault diagnosis and firmware
update only. It cannot be used
for audio connection or playback.
Contact your Dynaudio retailer
or Dynaudio directly for more
information of firmware updates.
Max. 12 V DC
100-120 V~, 200-240 V~
50/60 Hz 490 W
The 18S distance compensation
signal processing can only
function correctly if the monitors
are driven via the subwoofer
It’s time
to create
Here’s how to optimise your new 18S
for your own studio
Control and configuration
Control and configuration
With the 18S subwoofer positioned in the
studio and connected to signal cables
and mains power it can be switched on
via the mains switch above the mains
input socket on the rear panel.
The 18S must be configured
appropriately for the monitoring system
and main speakers with which it is to
be used. This is achieved via the rotary
controller, display and menu based
interface on the rear panel. Turn the
rotary controller to select configuration
parameters and press the control to
select options.
If multiple subwoofers are
employed they should be
configured identically.
Control and configuration
Subwoofer controls
The 18S configuration menu parameters
and their options are described in the
following paragraphs:
• Input sensitivity: Adjusts the input
sensitivity to match the output level
of your audio interface or console.
Initially select the 0dB option. Only
adjust the input sensitivity if the
subwoofer volume adjustment
doesn’t provide a suitable range.
• Volume: Set to match the volume of
your main speakers so that bass at
your main listening position is neither
too prominent or too quiet.
Setting the subwoofer volume is
important in terms of both overall
system balance and the demands
of different types of programme
• Presets: The 18S incorporates
low pass filter presets to match a
range of Dynaudio monitor models.
If your 18S is to be used in a system
with one of the Dynaudio models
listed, select it to configure the 18S
low pass filter appropriately. If your
subwoofer is to be used for the LFE
channel in a multi-channel system,
select the filter Bypass option.
• Parametric EQ: Provides three
bands of low frequency parametric
equalisation. Each band offers
frequency, gain and Q parameters.
Parametric is best used in
combination with low frequency
room acoustic analysis to identify
frequency response anomalies. The
equalisation is set to “flat” by default.
• Auto standby: Select to specify
the delay time before the subwoofer
will switch to Standby mode when
unused. The auto standby feature
can also be switched off.
• Line Wake-up: Select to enable or
disable trigger input switch on.
• L
eft main speaker distance:
Select to specify the distance in
metres of the left channel monitor
from the listening position.
• R
ight main speaker distance:
Select to specify the distance in
metres of the right channel monitor
from the listening position.
• S
ub speaker distance: Select to
specify the distance in metres of
the subwoofer from the listening
• Status: Select to display the
subwoofer operational status.
• Factory Reset: Select to return
your 18S to its default settings.
The rear panel Auto ON/OFF switch will
engage or defeat automatic switch on
and off in response to the presence or
absence of an input signal.
Rotary controller:
Rotate to select.
Press to confirm.
If your Dynaudio monitor model
is not listed among the 18S
presets, or your 18S is to be used
with monitors from an alternative
manufacturer, select a low pass
filter frequency closest to the
monitor’s specified -6dB low
frequency cut-off.
In use
In use
Once installed and configured, your
18S should require little attention other
than perhaps occasional volume control
adjustment to suit different types of
programme material.
Cleaning your subwoofer
Brush the cabinet surfaces with a clean
lint-free cloth. Do not use a vacuum
cleaner. If you wish to use a cleaning
agent, apply it to the cleaning cloth
and not directly to the subwoofer. Test
a small area first, as some cleaning
products may damage some of the
Should you require help or advice there
are a variety of support options for
Dynaudio products. These can be found
at dynaudio.com.
Twin opposed 9,5 in driver, closed box, active DSP subwoofer
Analog inputs
2 x balanced XLR, 2 x unbalanced RCA phono
Max. input voltage
1.01 Vrms @ +6 dB Sensitivity, 2.0 Vrms @ 0 dB Sensitivity
4 Vrms @ -6 dB Sensitivity, 10.1 Vrms @ -14 dB (LFE) Sensitivity
Analog outputs
2 x balanced XLR, 2 x unbalanced RCA phono
XLR output impedance
Differential: 200 Ω, Single-ended: 100 Ω
Phono output impedance
100 Ω
XLR Pin-out
Pin 1: ground, Pin 2: signal +, Pin 3: Signal –
Frequency response
16 Hz – 230 Hz ±3 dB
110 dB
Box Principle
Low Pass Filter
Phase Adjustment
0/180 degrees
2 x 24 cm MSP+ Hybrid Drive
Amplifier power
500 W
AC power input
100 - 120 V/220 - 240 V 50/60 Hz
Standby power consumption
< 0.5 W
Maximum power consumption
490 W
21.5 kg/45.2 lb
Dimensions (W x H x D)
447 x 300 x 268 mm/17.6 x 11.8 x 10.6 in
Dimensions with feet (W x H x D)
447 x 333 x 268 mm/17.6 x 13.1 x 10.6 in
Shipping box dimensions (W x H x D)
600 x 450 x 400 mm/23.6 x 17.7 x 15.7 in
Designed and engineered
by Dynaudio Labs in
Dynaudio A/S
8660 Skanderborg
18S Owner’s Manual
Item no. 4556202B
All text and image copyrights reserved.
Subject to change without notice.
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