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: [email protected]
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 [email protected]
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 retur-
ned 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 band-
pass 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 ma-
terial 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 spea-
ker 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
