Manual for Performance subwoofers
PERFORMANCE SERIES
SUBWOOFERS
W308B,
W310D, W312D
OA8,
OA10D, OA12D
WELCOME
SUBWOOFER ENCLOSURES, GENERAL
Thank you for buying a DLS PERFORMANCE series
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 except for OA8, OA10D and OA12D
that are designed for open air installations.
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.
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.
If you have an amplifier without built-in crossover you must
use a passive crossover between amplifier and subwoofer
like in this example:
+
1234567
1234567
1234567
L
C
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.
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 are 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. All the Classic subwoofers except for
OA12D, are recommended NOT to use in sealed
enclosures.
VENTED ENCLOSURES
A speaker in a vented enclosure has a higher efficiency (3
dB) and higher power handling capacity than in a sealed
enclosure. In a vented enclosure the sound from the speaker and the port work together creating a higher sound
level. The sound from the port must come out in the same
phase as from the speaker otherwise the result is bad.
The size of the vented enclosure is decided by the speaker data just as for the sealed one.
The size of the vehicle often decides the practical size of
the enclosure. A smaller enclosure has a higher resonant
frequency than the larger one. The size of the enclosure
should not be so big that the speaker plays below it´s own
free air resonance (Fs), then it looses in power handling
capacity.
The port does not have to be fully inside the enclosure as
long as the area and length are correct.
Sometimes you need two or more ports in an enclosure.
You can convert from one to two or more ports as long as
the total port area is the same.
BANDPASS ENCLOSURES
In all bandpass enclosures the speakers are hidden inside the enclosure, all sound is coming out through the
ports. There are different types of bandpass enclosures
and they have in common that they are a bit more difficult
to build. Most of our subwoofers can be used in bandpass
enclosures
TECHNICAL SPECIFICATIONS FOR DLS PERFORMANCE SUBWOOFERS
Size
Impedance
Nom. power (RMS)
Freq. range
Sensitivity
Voice coil diameter
Voice coil height
Re
Voice coil inductance, 1 kHz
BL product
X-max
Suspension compliance CMS
SD- Effective piston area
Resonant freq. (Fs)
Vas (liters)
Vas (ft3)
Qms
Qes
Qts
Cone material
Magnet weight
Magnet diameter
Installation depth
Mounting hole
Outer diameter
Weigth
W308B
W310D
W312D
20 cm (8")
4 ohm
100 W (max 150)
30 Hz - 2 kHz
87,1 db
50 mm (2”)
22 mm (0,87”)
3,1 ohm
1,5 mH
7,8
+-5 mm (0,2”)
478
214 cm2
36,3 Hz
30,5
1,08
3,55
0,45
0,40
Coated non-compress paper
40 oz (1,13 kg)
4,7" (120 mm)
3,94" (100 mm)
7,08" (180 mm)
8,27" (210 mm)
6,6 lb (3 kg)
25 cm (10")
4 ohm
120 W (max 200)
25 Hz - 2 kHz
89 dB
50 mm (2”)
22 mm (0,87”)
3,4 ohm
1,1 mH
11,5
+-5 mm (0,2”)
349
314,6 cm2
36 Hz
48,6
1,72
2,49
0,32
0,28
Coated non-compress paper
40 oz (1,13 kg)
5,7" (145 mm)
5,28" (134 mm)
9,45" (240 mm)
10,43" (265 mm)
8,82 lb (7 kg)
30 cm (12")
4 ohm
150 W (max 250)
20 Hz - 2 kHz
91 dB
50 mm (2”)
22 mm (0,87”)
3,3 ohm
1,1 mH
12,22
+-5 mm (0,2”)
317
452,3 cm2
30 Hz
115
4,06
3,26
0,36
0,34
Coated n-cp paper
50 oz (1,42 kg)
6,14" (156 mm)
5,83" (148 mm)
11,1" (282 mm)
12,13" (308 mm)
10,36 lb (4,7 kg)
RECOMMENDED ENCLOSURES FOR W308B, W310D & W312D
RUNNING-IN PERIOD
Allow the speaker to play for at least
15-20 hours. After this time the
performance is correct.
Subwoofer
W308B
W310D
W312D
Volume (liters/ft3)
vol: 18 / 0,64
vol: 28,5 / 1,0
vol: 41,6 / 1,47
VENTED ENCLOSURE
Port
3” x 30 cm/ 11,8”
3” x 14 cm/5,5”
4” x 32 cm/12,6”
F3 = approximative lower frequency for
vented boxes in Hz. Often called F-3 dB point
= the point where the power is 50% lower.
Fb = Box resonant frequency
Damping
Line inside
Line inside
Line inside
F3
45,9 Hz
48,4 Hz
47,1 Hz
Fb
45 Hz
45,0 Hz
40,2 Hz
SEALED BANDPASS
The speaker is installed in Vb1
playing into chamber Vb2 where
the port(s) are installed.
SEALED ENCLOSURE
Vb1=rear, Vb2=front
W310D
W308B
Vb1
Vb2
port Vb2
22,17 13,98 1x10,2x35,5 cm
0,78 ft3 0,49 ft3 1x4"x14" (US)
F3 Vb1: 40 Hz, Vb2: 118 Hz
Vb1
Vb2
port Vb2
8,02
4,93
1x6,8x33 cm
0,28 ft3 0,17 ft3 1x3"x13" (US)
F3 Vb1: 50 Hz, Vb2: 141,9 Hz
W312D
Vb1
Vb2
port Vb2
32,84 37,23 2x10,2x19 cm
1,16 ft3 1,32 ft3 2 x 4" x 7,5" (US)
F3 Vb1: 45 Hz, Vb2: 99 Hz
W310D sealed enclosure:
18 liters / 0,64 ft3
We don´t recommend the use of
sealed enclosures for W308B &
W312D
TECHNICAL SPECIFICATIONS FOR DLS PERFORMANCE SUBWOOFERS
Size
Impedance
Nom. power (RMS)
Freq. range
Sensitivity
Voice coil diameter
Voice coil height
Re
Voice coil inductance, 1 kHz
BL product
X-max
Suspension compliance CMS
SD- Effective piston area
Resonant freq. (Fs)
Vas (liters)
Vas (ft3)
Qms
Qes
Qts
Cone material
Magnet weight
Magnet diameter
Installation depth
Mounting hole
Outer diameter
Weigth
OA8
OA10D
OA12D
20 cm (8”)
8 ohms
150 W (max 250)
30 Hz - 2 kHz
85,1 dB
50 mm (2”)
34 mm (1,34”)
7 ohm
5,7 mH
15,46
+- 9 mm (0,35”)
375
214 cm2
32 Hz
23,96
0,85
2,59
0,39
0,34
Coated non-compressed paper
80 oz (2,27 kg)
4,72” (120 mm)
4,72” (120 mm)
7,08” (180 mm)
8,27” (210 mm)
8,83 lb (3,8 kg)
25 cm (10")
4 ohm
180 W (max 360)
25 Hz- 2 kHz
86,5 dB
50 mm (2”)
34 mm (1,34”)
3,59 ohm
1,72 mH
11,96
+-9 mm (0,35”)
183
314,6 cm2
39,9 Hz
25,5
0,6
3,19
0,55
0,47
Coated non-compressed paper
80 oz (2,27 kg)
5,71" (145 mm)
6,02" (153 mm)
9,45" (240 mm)
10,43" (265 mm)
12,13 lb (5,5 kg)
30 cm (12")
4 ohm
210 W (max 400)
20 Hz-2 kHz
88,4 db
50 mm (2”)
34 mm (1,34”)
3,55 ohm
1,79 mH
12,53
+-9 mm (0,35”)
167
452,3 cm2
37,8 Hz
48
1,69
3,47
0,57
0,49
Coated non-compressed paper
80 oz (2,27 kg)
5,71" (145 mm)
6,65" (169 mm)
11,10" (282 mm)
12,13" (308 mm)
12,79 lb (5,8 kg)
RECOMMENDED ENCLOSURES FOR OA8, OA10D & OA12D
OA8, OA10D & OA12D
subwoofers are designed for
open air use but can also be
used in these enclosures.
F3 = approximative lower frequency for
vented boxes in Hz. Often called F-3 dB point
= the point where the power is 50% lower.
Fb = Box resonant frequency
VENTED ENCLOSURE
Subwoofer
OA8
OA10D
OA12D
Volume (liters/ft3)
15 / 0,53
29 / 1,02
use sealed enclosure
Port
3” x 44 cm / 17” ***
3” x 28 cm/11”
Damping
Line inside
Line inside
F3
45,1 Hz
34,7 Hz
Fb
35,0 Hz
*** It is impossible to have a 44 cm port inside a 15 liter enclosure! If you want to use the vented box just cut the
port tube 2,5 cm / 1” from the back wall for a good function. Doing so the subwoofer sees the port to be longer than
it is because the short distance between port and back wall has an influence on the air flow through the port.
SEALED BANDPASS
The speaker is installed in Vb1
playing into chamber Vb2 where
the port(s) are installed.
Vb1=rear, Vb2=front
OA10D
Vb1
Vb2
Port Vb2
11,96 13,35 1x10,2x46 cm
0,42 ft3 0,47 ft3 1x4"x18,1" (US)
F3 Vb1: 42,9 Hz, Vb2: 102,1 Hz
OA12D
Vb1
Vb2
Port Vb2
31,68 52,88 3x10,2cm x21 cm
1,12 ft3 1,87 ft3 3 x 4" x 8,26" (US)
F3 Vb1: 48,2 Hz, Vb2: 89,6 Hz
SEALED ENCLOSURE
OA8 sealed enclosure:
13 liters / 0,46 ft3
F3 46,7 Hz
OA10D: use vented enclosure
OA12D sealed enclosure:
39 liters / 1,38 ft3
F3: 49,4 Hz
or if you want a smaller box:
27 liters / 0,95 ft3
HINTS & TIPS FOR ”DO IT YOURSELF” ENCLOSURE BUILDERS
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. In this
case a bandpass box could be a better choise.
- All volumes are inside measures.
- Volumes occupied by speaker and ports have already
been added to the given enclosure volumes.
- Use conical bass ports for best result. (DLS BP-75 or
BP-110). If the ports are too long for the box you can use
a bend. Either cut the tube and glue it together in angle, or
use factory made tube bends. It´s easier to use the factory
made ones. The total length must be the same as for a
straight tube. Make the measure in the center of the tube.
The port opening inside the enclosure must not be closer
to an interior wall than 3” (75 mm), otherwise it will have
negative effects on the airflow.
- 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.
In a vented enclosure the speaker and port should be on
the same side, otherwise a fade-out of some frequencies
can occour. In most vehicles, except for SEDAN cars, the
speaker and port should be directed backwards for best
result.
upper
suspension
THE SUBWOOFER
speaker cone
chassis
voice coil
magnet
dust cap
spider
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 speaker or port through this
opening. There must be some free space in front of the
port, (between the rear seat and the port 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.
CALCULATE YOUR ENCLOSURE
Box volumes:
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:
Vol=width (W) x heigth (H) x upper depth(UD) + lower depth(LD)
2
W
UD
H
Be sure to measure the
inside dimensions.
LD
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.
pole plate
T-yoke
Technical Assistance
DLS Svenska AB
P.O. Box 13029
SE-40251 Göteborg, Sweden
Tel: +46 31 840060
Fax: +46 31 844021
E-mail: info@dls.se
www.dls.se
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.
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