Welcome
Thank you for buying a DLS Ultimate Nordica 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. In "open
air" installations the power handling capacity is reduced by 30%
from the nominal value.
We don’t recommend ”open air”
installations for these subwooers
.
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 built-in lowpass crossover
and possibilities to connect your subwoofer in bridge
mode.These subwoofers have a 4 ohm nominal impedance.
Two 4 ohm subwoofers are often connected in stereo mode
since most amplifiers can’t handle bridge mode loads below 4
ohms.
For Nordica subwoofers we recommend the use of an 2 ohm
stable amplifier with a minimum output power of 200 Watts RMS.
Make sure to connect in ways that don’t ruin the amplifier. If you
have a DLS Ultimate amplifier it’s possible to connect two
subwoofers in parallel, these amplifiers are 1 ohm stable.
We also recommend the use of a subsonic high pass 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 AWG11 (4 mm
2
).
For example
DLS SC 2x4.
Enclosure damping
Most enclosures should be damped inside with synthetic
(acoustic) wool or damping mat (line). Attach the damping ma-
terial on the wall opposite from the speaker and port.
In a sealed box we recommend the use of damping wool.
Subwoofer enclosures, general
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.
Sealed (closed) 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 air-
tight.
A sealed enclosure should be filled with acoustic wool up to
75%.
A sealed enclosure has a lower efficiency than a vented
enclosure, 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.
Important
Think of the speaker weight when you do your install. Use heavy
bolts when fastening the sub to the enclosure baffle.
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
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.
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Technical Assistance
For technical assistance ask the shop where the product was
sold or the distributor in your very country. You can always
contact the DLS Helpdesk in Sweden on e-mail :
info@dls.se
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.
Break-in period
Allow the speaker to play for at least 15-20 hours. After this
time the performance is correct.
DLS Ultimate series
Nordica10 & Nordica 12
Car Audio subwoofers
