DLS KW10, KW12 User Manual

CLASSIC SERIES

7

KW10

SUBWOOFERS

WELCOME

Thank you for buying a DLS CLASSIC subwoofer.
The subwoofer must be installed correctly in order to work
well. This manual will show you how to install it like a pro.
Please read the entire manual before beginning the in­stallation.
Install the subwoofer yourself if you feel confident with
our instructions and if you have the proper tools. However
if you feel unsure, turn over the installation job to someone
better suited to it.
The speakers are designed for enclosure mounting. When
installed "open air" the power handling capacity is reduced
with 30% from the nominal value. We dont recommend
”open air” installations.

CONNECTION OF SUBWOOFER

How to connect depends on what type of amplifier you
use. The best is to follow the instructions given in the
manual for the amplifier. Most amplifiers today have built­in lowpass crossover and possibilities to connect your
subwoofer in bridge mode.
Two 4 ohm subwoofers are often connected in stereo mode
since most amplifiers can´t handle bridge mode loads
below 4 ohms. If you have a DLS Ultimate amplifier it´s
possible to connect two 4 ohm subs in bridge mode, these
ampliers are 1 ohm stable.
We also recommend the use of a subsonic highpass filter.
This gives a better bass reproduction with less "rumble".
In most DLS amplifiers this feature is already built-in.
For wiring use high class speaker wires, min AWG13 (2.5
mm2). For example DLS SC 2x2,5.

KW12

SUBWOOFER ENCLOSURES, GENERAL

Build your enclosure in a stable and airtight material. The
best is MDF-board, 19 mm, or particle board, 22 mm.
Larger enclosures must have bracing inside to avoid
vibrations. The enclosure must be completely airtight. Use
sealing compound in all joints, also around the cable
terminals. The size of the enclosure is decided by the spea­ker data.

SEALED ENCLOSURES

Sealed enclosures are easy to build. The size is not critical,
but it can´t be too small. The speaker data such as Fs,
Qts, Vas and X-max decides the size of the enclosure.
Large speakers need larger boxes. Two speakers need a
box of the double size etc. The enclosure must be
completely airtight. A sealed enclosure should be filled
with acoustic wool up to 75 - 100%.
A sealed enclosure has a lower efficiency than vented
enclosures but they can handle high power and is easy to
build. A subwoofer in a sealed enclosure creates a tight
bass suitable for the audiophiles listening to classical mu­sic, jazz and soft rock. KW10 and KW12 are designed for
use in sealed enclosures.

CALCULATE YOUR ENCLOSURE VOLUME

When caculating the volume of an enclosure you simply
multiply the width (W) x heigth (H) x depth (D).
Use measures in dm and you will get the answer in liters.

A trapezoid box is calulated as below:

If you have an amplifier without built-in crossover you must
use a passive crossover between amplifier and subwoofer
like in this example:

+

-

Connected with a 12 dB passive low-pass x-over = 10 mH
coil in series and a bipolar capacitor of 300 microFarad in
parallel. Crossover frequency is 95 Hz.

23456

L

C

DLS Svenska AB

P.O. Box 13029

SE-40251 Göteborg, Sweden

Tel: [phone]

Fax: [phone]

E-mail: [e-mail]

www.dls.se

Vol = width (W) x heigth (H) x upper depth(UD) + lower depth(LD)

2

W

UD

H

LD

Be sure to measure the
inside dimensions.

WARRANTY SERVICE

This speaker is covered by warranty, depending on the conditions
in the country where it is sold. If the speaker is returned for
service, please include the original dated receipt with the product.

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Technical Assistance

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For technical assistance ask the shop where the product was
sold or the distributor in your very country.You can always
phone the DLS Helpdesk in Sweden + 46 31 840060 or send
an e-mail to info@dls.e
Information can also be found on our WEB-site www.dls.se
We follow a policy of continuous advancement in
development. For this reason all or part of specifications &
designs may be changed without prior notice.

TECHNICAL SPECIFICATIONS FOR DLS SUBWOOFERS

KW10 KW12

Size 25 cm (10") 30 cm (12")
Impedance 4 ohm 4 ohm
Nom. power (RMS) 200 W (max 400) 250 W (max 400)
Freq. range 25 Hz - 2 kHz 20 Hz - 2 kHz
Sensitivity 89,2 dB 91,3 dB
Voice coil diameter 50 mm (2”) 50 mm (2”)
Re 3,2 ohm 3,2 ohm
Voice coil inductance, 1 kHz 1,87 mH 1,86 mH
BL product 9,9 9,75
X-max +-9 mm (0,35”) +-9 mm (0,35”)
Suspension compliance CMS 243 336
SD- Effective piston area 363 cm
Resonant freq. (Fs) 37 Hz 33 Hz
Vas (liters) 50 113
Vas (ft3) 1,77 4,00
Qms 5,28 3,57
Qes 0,58 0,48
Qts 0,53 0,42
Cone material Paper Paper
Magnet weight 30 oz 30 oz
Magnet diameter 4,72" (120 mm) 4,72" (120 mm)
Installation depth 4,57" (116 mm) 5,24" (133 mm)
Mounting hole 9,69" (246 mm) 10,94" (278 mm)
Outer diameter 10,51" (267 mm) 12,12" (310 mm)
Weigth 6,39 lb (2,9 kg) 8,82 lb (4 kg)

2

491 cm

2

RUNNING-IN PERIOD

Allow the speaker to play for at least
15-20 hours. After this time the
performance is correct.

RECOMMENDED SEALED ENCLOSURES FOR KW10 & KW12

Subwoofer Volume (liters/ft3) Damping

KW10 vol: 20-25 / 0,71-0,88* Wool
KW12 vol: 26-30 / 0,92-1,06* Wool
*Use the smaller volume for more ”kick” in the bass, the larger volume for more deep HiFi bass.

ENCLOSURE PLACING IN DIFFERENT TYPES OF
VEHICLES

In small vehicles like VW Golf, Peugeot 306 and similar
the bass box should be installed with both speaker and
port directed backwards. Alternatively booth speaker and
port can be directed upwards. This way of mounting is
valid for all types of vehicles where the trunk is incorporated
with the inner compartment.

In sedan vehicles with the passenger compartment
separated from the trunk, the enclosure should be installed
with booth speaker and port directed towards the rear seat.
Some cars have an opening in the middle of the rear seat
for loading skis etc. You can install the enclosure behind
this opening and direct your speaker through this opening.

In large vehicles like station wagons the best sound is
achieved with the enclosure installed behind the rear seat
with booth speaker and port directed backwards.
Alternatively you can install the enclosure on one side of
the luggage compartment.

ABOUT THE RECOMMENDED ENCLOSURES

The performance of these recommended enclosures will
vay from vehicle to vehicle. It is more difficult to get a tight
and well defined bass in a SEDAN vehicle because of the
tightness between trunk and interior of the vehicle.

- All volumes are inside measures.

- Volumes occupied by speaker and ports have already
been added to the given enclosure volumes.

- The enclosure must be very steady and completely air­tight. Use 22 mm particle board or 19 mm MDF-board.
The particle board has a self resonant frequency of 14 Hz
while the MDF has a resonant frequency of approx. 400
Hz. It´s important to do some type of bracing inside the
enclosure to avoid vibrations.
Volume taken up by bracing should be added to the
enclosure volumes.

ENCLOSURE DAMPING

Most enclosures should be damped inside with syntetic
(acoustic) wool or damping mat (line). Attach the damping
material on the wall opposite from the speaker and port. A
sealed enclosure should be filled up to 70-100% with
acoustic wool.

SEALED ENCLOSURE