DLS Svenska AB Speaker NOBELIUM 10 User Manual

Nobelium 10  
Nobelium 12  
Nobelium 15  
ULTIMATE Nobelium  
SERIES SUBWOOFERS  
*Nobelium is a radioactive metal with atomic number 102. It is named after the Swedish scientist Alfred Nobel  
WELCOME  
SUBWOOFER ENCLOSURES, GENERAL  
Thank you for buying a DLS ULTIMATE Nobelium 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.  
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 ENCLOSURES  
The speakers are designed for enclosure mounting. In "open  
air" installations the power handling capacity is reduced by 30%  
from the nominal value. We dont recommend ”open air”  
installations for Ultimate Nobelium subwooers.  
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  
- 100%.  
A sealed enclosure has a lower efficiency than vented  
enclosures but they can handle high power and are easy to  
build.  
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.  
Two 4 ohm subwoofers are often connected in stereo mode  
since most amplifiers can´t handle bridge mode loads below 4  
ohms.  
A subwoofer in a sealed enclosure creates a tight bass suitable  
for the audiophiles listening to classical music, jazz and soft  
rock. The Nobelium subwoofers can be used in sealed  
enclosures.  
The Iridium subwoofers have dual, four ohm, voice coils. Each  
voice coil has an impedance of 4 ohms. If they are connected in  
series the resulting impedance is 8 ohms. If they are connected  
in parallel the resulting impedance is 2 ohms. Make sure to  
connect in a way that don´t ruin the amplifier. If you have a DLS  
Ultimate amplifier it´s possible to connect the voice coils in  
parallel, these ampliers are 1 ohm stable.  
VENTED ENCLOSURES  
A speaker in a vented enclosure has a higher efficiency (3 dB)  
and higher power handling capacity than in a sealed enclosure.  
In a vented enclosure the sound from the speaker and the port  
work together creating a higher sound level. The sound from  
the port must come out in the same phase as from the speaker  
otherwise the result is bad.  
We also recommend the use of a subsonic highpass filter. This  
gives a better bass reproduction with less "rumble". In most  
DLS amplifiers this feature is already built-in.  
The size of the vented enclosure is decided by the speaker  
data just as for the sealed one.  
For wiring use high class speaker wires, minAWG13 (2.5 mm2).  
The size of the vehicle often decides the practical size of the  
enclosure. Asmaller enclosure has a higher resonant frequency  
than the larger one. The size of the enclosure should not be so  
big that the speaker plays below it´s own free air resonance  
(Fs), if so the power handling capacity drops.  
The port does not have to be fully inside the enclosure as long  
as the area and length are correct. Sometimes you need two or  
more ports in an enclosure. You can convert from one to two or  
more ports as long as the total port area is the same.  
All Nobelium subwoofers can be usedl in vented boxes.  
For example DLS SC 2x4.  
If you have an amplifier without built-in crossover you must use  
a passive crossover between amplifier and subwoofer like in  
this example, one crossover for each voice coil.  
Component values are for 4 ohms.  
+
L
C
BANDPASS ENCLOSURES  
-
In all bandpass enclosures the speakers are hidden inside the  
enclosure, all sound is coming out through the ports. There are  
different types of bandpass enclosures and they have in com-  
mon that they are a bit more difficult to build. DLS Iridium  
subwoofers can be used in bandpass enclosures.  
Connected with a 12 dB passive low-pass x-over = 10 mH coil  
in series and a bipolar capacitor of 300 microFarad in parallel.  
Crossover frequency is 95 Hz.  
Active filter  
Amplifier  
IMPORTANT!  
Think of the speaker weight when you install it. If you don´t  
mount it properly it can come loose.  
Connection in mono bridge mode with an active x-over. Voice  
coils connected in series. If you have a 1 ohm stable amplifier  
the voice coils should be connected in parallel for best  
performance (for example on a DLS monoblock).  
Valid from 2005-07-04  
 
RECOMMENDED ENCLOSURES FOR Nobelium10, 12 and 15  
VENTED ENCLOSURES  
F3 = approximative lower frequency for vented  
RUNNING-IN PERIOD  
Allow the speaker to play for at least 15-  
20 hours. After this time the  
performance is correct.  
VENTED BOX  
boxes in Hz. Often called F-3 dB point = the point  
where the power is 50% lower.  
Fb = Box resonant frequency  
Sub Connection  
Volume (litre/ft3)  
Port  
3” x 18 cm/7,1”  
3” x 25,7 cm / 10”  
4” x 29 cm/ 11,4”  
4” x 32 cm / 12,6”  
Damping  
Line inside  
Line insida  
Line inside  
Line inside  
F3  
Fb  
10”  
12”  
12”  
12”  
15”  
VC in parallel  
Single VC  
VC in series  
VC in parallel  
VC in parallel  
31,65 / 1,1  
34,4 / 1,21  
35,87 / 1,26  
46,10 / 1,1  
56,5 / 1,99  
39,3 Hz  
33,7 Hz  
46,4 Hz  
37,3 Hz  
50,2 Hz  
39,0 Hz  
33,0 Hz  
45,0 Hz  
36,9 Hz  
45,0 Hz  
2x4” x 40 cm / 15,7” Line inside  
SEALED BANDPASS  
Nobelium10 (VC:s in parallel to 2 ohm)  
Vb1  
20,1  
Vb2  
17  
Port Vb2  
2 x6,8 x 27,6 cm  
0,71 ft3 0,60 ft3 2 x 3" x 10,8" (US)  
F3 Vb1: 44,8 Hz, Vb2: 86,6 Hz  
Nobelium12 (VC:s in parallel to 2 ohm)  
Vb1  
Vb2  
Port Vb2  
24,46 32,12 2 x10,2 x 27 cm  
0,86 ft3 1,13 ft3 2 x 4" x 10,6" (US)  
F3 Vb1: 45 Hz, Vb2: 94 Hz  
Vb1=rear chamber,  
Vb2=front chamber  
Nobelium12 (Single VC, 4 ohm)  
Vb2  
23,95 22,37 1 x10,2 x 29 cm  
0,84 ft3 0,79 ft3 1 x 4" x 11,4" (US)  
F3 Vb1: 38,5 Hz, Vb2: 79 Hz  
The speaker is installed in Vb1  
playing into chamber Vb2 where the  
port(s) are installed.  
Vb1  
Port Vb2  
SEALED ENCLOSURES  
Nobelium10, single VC:  
28 litres / 0,99 ft3  
F3: 52,7 Hz  
Nobelium10, dual VC in parallel:  
17,4 litres / 0,61 ft3  
F3: 73,4 Hz  
SEALED BOX  
Nobelium 12, single VC:  
23,2 litres / 0,82 ft3  
F3: 51,9 Hz  
Nobelium 15, single VC:  
45 litres / 1,59 ft3  
F3: 51,5 Hz  
Nobelium 12, dual VC in parallel:  
43,72 litres / 1,54 ft3  
F3: 52,4 Hz  
Nobelium 15, dual VC in parallel:  
40 litres / 1,41 ft3  
F3: 64,5 Hz  
 
HINTS & TIPS FOR ”DO IT YOURSELF” ENCLOSURE BUILDERS  
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.  
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.  
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).  
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.  
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:  
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.  
Vol=width (W) x heigth (H) x upper depth (UD) + lower depth (LD)  
2
B
ÖD  
Be sure to measure the  
inside dimensions.  
H
ND  
upper  
suspension  
THE SUBWOOFER  
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.  
cone  
spider  
dust cap  
chassis  
voice coil  
magnet  
pole plate  
T-yoke  
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-  
DLS Svenska AB  
P.O. Box 13029  
SE-40251 Göteborg, Sweden  
Tel: +46 31 840060  
Fax: +46 31 844021  
We follow a policy of continuous advancement in development.  
For this reason all or part of specifications & designs may be  
changed without prior notice.  
 

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