DLS Svenska AB NOBELIUM 10, NOBELIUM 15, NOBELIUM 12 User Manual

ULTIMATE Nobelium

7

SERIES SUBWOOFERS

*Nobelium is a radioactive metal with atomic number 102. It is named after the Swedish scientist Alfred Nobel

Nobelium 10
Nobelium 12
Nobelium 15

WELCOME

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.
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.

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.
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.

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.
For wiring use high class speaker wires, min AWG13 (2.5 mm
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.

+

23456

L

C

-

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

2

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 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 air­tight.
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.
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.

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.
The size of the vented enclosure is decided by the speaker
data just as for the sealed one.

).

The size of the vehicle often decides the practical size of the
enclosure. A smaller 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.

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 com­mon that they are a bit more difficult to build. DLS Iridium
subwoofers can be used in bandpass enclosures.

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

Technical specifications for DLS ULTIMATE Nobelium 10

Size 25 cm (10")
Impedance 2 x4 ohm
Nom. power (RMS) 500 W (max 800)
Frequency range 25 Hz - 2,5 kHz
Voice coil, diameter 75 mm (3”)
Voice coil, length 40 mm (1,57”)
X-max +-14 mm (0,55”)
SD 346 cm
Cone material Aluminium
Upper surround Rubber
Magnet weight 180 oz (5,1 kg)
Magnet, diameter 180mm (7,08”)
Installation depth 133 mm (5,24”)
Mounting hole 236 mm (9,29”)
Outer diameter 266 mm ( 10,47”)
Weight 9,5 kg (20,9 lb)

2

Data that can vary depending on how the voice coils are connected:

Single voice coil Voice coils in
4 ohm parallel 2 ohm

Re, DC-resistance 3,2 ohm 1,7 ohm
Z, impedance 4 ohm 2 ohm
Cms 143 143
Zo (Z max at Fs) 15,92 ohm 14,03 ohm
BL product 9,35 9,21
Sensitivity 85,6 dB 88,2 dB
Resonant freq. (Fs) 43,5 Hz 43,5 Hz
Vas (litre) 26,77 26,75
Vas (ft3) 0,95 0,95
Qms 3,72 3,72
Qes 0,93 0,51
Qts 0,75 0,45

Technical specifications for DLS ULTIMATE Nobelium 12

Size 30 cm (12")
Impedance 2 x4 ohm
Nom. power (RMS) 600 W (max 1000)
Freq. range 20 Hz - 2,5 kHz
Voice coil, diameter 75 mm (3”)
Voice coil, length 40 mm (1,57”)
X-max +-14 mm (0,55”)
SD 491 cm
Cone material Aluminium
Upper surround Rubber
Dual spiders Yes
Magnet weight 180 oz (5,1 kg)
Magnet, diameter 220mm (8,7”)
Installation depth 140 mm (5,51”)
Mounting hole 282 mm (11,1”)
Outer diameter 312 mm ( 12,28”)
Weigth 12,2 kg (28 lb)

2

Data that can vary depending on how the voice coils are connected:

Single coil, Voice coils in Voice coils in
4 ohm series, 8 ohm parallel, 2 ohm

Re, DC-resistance 3,5 ohm 7 ohm 1,9 ohm
Z, impedance 4 ohm 8 ohm 2 ohm
Cms 120,5 193,4 182,2
Zo, (Z max at Fs) 20,3 ohm 71,8 ohm 13,3 ohm
BL product 15,72 21,02 9,12
Känslighet (SPL at 1W) 85,6 dB 90,5 dB 88 dB
Resonant freq. (Fs) 32,2 Hz 34,6 Hz 33,8 Hz
Vas (litre) 41,25 66,1 62,3
Vas (ft3) 1,456 2,33 2,2
Qms 2,78 3,48 3,53
Qes 0,58 0,37 0,59
Qts 0,48 0,34 0,50

Technical specifications for DLS ULTIMATE Nobelium 15

Size 37,5 cm (15")
Impedance 2 x4 ohms
Nom. power (RMS) 600 W (max 1000)
Frequency range 15 Hz - 2,5 kHz
Voice coil, diameter 75 mm (3”)
Voice coil, length 40 mm (1,57”)
X-max +-14 mm (0,55”)
SD 779 cm
Cone material Aluminium
Upper suspension Rubber
Magnet weight 200 oz (5,67 kg)
Magnet, diameter 220mm (8,7”)
Installation depth 176 mm (6,93”)
Mounting hole 360 mm (14,17”)
Outer diameter 390 mm ( 15,35”)
Weight 13,8 kg (30,4 lb)

2

Data that can vary depending on how the voice coils are connected:

Single coil Voice coils in
4 ohm parallel 2 ohm

Re, DC-resistance 3,6 ohm 1,7 ohm
Z, impedance 4 ohm 2 ohm
Cms 142,5 142,5
Zo, Z max at Fs) 19,4 ohm 17,18 ohm
BL product 11,8 11,4
Sensitivity 90 dB 92,3 dB
Resonant freq. (Fs) 34,7 Hz 34,7 Hz
Vas (liter) 130,7 130,7
Vas (ft3) 4,6 5,6
Qms 3,62 3,77
Qes 0,82 0,49
Qts 0,67 0,43