DLS Svenska AB NOBELIUM 12 About The Recommended Enclosures, Enclosure Damping, The Subwoofer

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 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

	B
	ÖD
H	Be sure to measure the
	inside dimensions.
	ND

	THE SUBWOOFER	upper
		suspension
	cone
chassis	dust cap	spider
voice coil		pole plate
magnet
		T-yoke

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.

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 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.