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DLS SOUND HANDBOOK - ENCLOSURES
SOME ADVICES FROM DOCTOR "BACKE"
When building a bass box the following are very
important:
The box must be very steady and completely air-tight.
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. Its important to stabilize the box in-
side with some braces, especially the boxes made
of MDF could cause "PLONK"-sounds if it´s not
sufficiently braced.
If you are using a milling machine its better to use
MDF-board since particle board wears the cutter
edge. After cutting all pieces to the box you attach
glue in all joints and screws every 10 cm. Use more
screws if the edge cutting isn´t perfect.
The length of the screws should be a little more than
double the board thickness. Tighten all joints with ex-
tra silicon sealing compound.
If you build a bandpass box let one side be removable
to make it easier to change speaker.
Use sealing strips in the joint. The length of the screws
should be 3 times the board thickness. Mount them
6 cm apart.
Use conical bass ports for best result. (DLS BP-75
or BP-110).
If the ports are too long for the box you can add a
bend to it. 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 box must not be closer
to a box wall than the ports own diameter. Otherwise
it will have negative effects on the airflow.
Most boxes should be damped inside with syntetic
(acoustic) wool (do not use any rockwool types).
Attach the damping material on the wall opposite from
the speaker and port. A sealed box should be filled
up to 70-100% with acoustic wool.
In a vented box the speaker and port should be
mounted on the same side, otherwise a fade-out of
some frequencies can occour. In most car-types,
except for SEDAN cars, the speaker and port should
be directed backwards for best result.
If you plan not to cover your box with felth cloth or
imitation leather you should also tighten behind the
speaker element before mounting it in the box. It must
be absolutely air-tigth.
If you build an isobaric-box use through screws with
nuts and washers to fasten the speakers. Also tighten
the screw holes with sealing compound. Be sure to
connect the isobaric speaker pair in the correct way.
You can´t use felt cloth or similar in front of the ports,
especially in band-pass boxes.
Good luck with your box project!
BOX EXAMPLES
On the following pages you will find examples on
suitable boxes for DLS speakers and subwoofers.
If you follow the advices in this handbook we are sure
you achieve a good car sound.
ENCLOSURES FOR HOME USE
Very often we get questions from customers who
wants to use our speakers in boxes for home use.
In general a box for home use should be 50-100%
larger in volume than a box for mobile use.
Here are some suitable box volumes for some of our
speakers when used for home use.
Speaker
226/426
PS6/PS6A
R6A
MS6
UP6
UR6/UR6S
Iridium 6
Iridium 8"
Subwoofers
OA10
OA12
W610/710
W612/712
MW10/110
MW12/112
UR10
UR12
For volumes in cubic feet, divide the volume in liter
with 28,32.
For port lengths in inch, divide the port length in cm
with 2,54
If you have any questions you are always welcome
to contact us on DLS in Sweden. We will do our
best to assist you.
E-mail:
info@dls.se
20
Volume
Port / port length
25 liter
3", 1,5 cm long
30 liter
3", 3,5 cm long
28 liter
3", 13 cm long
37 liter
3", 1,5 cm long
21 liter
3", 5,5 cm long
20 liter
3", 15 cm long
18 liter
3", 18 cm long
30 liter
3", 9 cm long
33 liter
3", 21 cm long
52 liter
4", 30 cm long
40 liter
3", 22 cm long
60 liter
4", 34 cm long
40 liter
3", 23 cm long
62 liter
4", 33 cm long
31 liter
3", 32 cm long
41 liter
3", 22 cm long
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