HINTS & TIPS FOR ”DO IT YOURSELF” ENCLOSURE BUILDERS
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
Technical Assistance
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 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.
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.
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 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. 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.
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
THE SUBWOOFER
Be sure to measure the
inside dimensions.
upper
suspension
voice coil
pole plate
magnet
spider
chassis
dust cap
speaker cone
T-yoke
W
H
UD
LD
