DALI SUB C-8 D
WHITEPAPER
INTRODUCTION
Unlike some subwoofers the DALI SUB C-8
D has been engineered to perform equally
well on both music and movies. It is very
important to DALI that a subwoofer can
render a performance true to the input signal.
Therefore a DALI subwoofer is everything but
a ‘boombox’.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
ACOUSTIC BACKGROUND
Frequency Response
DALI ZENSOR 1 and DALI E-9 F
DALI E-9 F
DALI ZENSOR 1
Frequency Response
100.0
dBSPL
90.0
80.0
70.0
60.0
50.0
DALI SPEKTOR 2 and DALI SUB C-8 D
DALI SUB C-8 D
DALI SPEKTOR 2
The DALI SUB C-8 D clearly has its heart set on high fidelity.
The DALU SUB C-8 D will feel equally at home in a movie
focused surround setup and a compact stereo setup
meant for mainly musical enjoyment.
Over the years DALI’s engineers have developed a set of
sound design principles. Today these are applied in the
creation of any DALI speaker. Naturally our subwoofers
must be able to enter into any setup without sacrificing
the purpose of providing wide dispersion, time coherent
and low-loss performance.
You can read more about our sound
design principles at https://www.dalispeakers.com/sound/sound-design/
DALI A/S www.dali-speakers.comDALI SUB C-8 D
CABINET
The solid MDF cabinet is designed and manufactured
to meet the tough DALI specifications. The enclosure
comes in a choice of Black Ash or White finishes, making
it blend perfectly with most speaker designs and room
decors.
The entire cabinet is effectively decoupled from the
floor by means of four polymer based oversized spikes.
Appearing to hover above the floor the distance of
30 mm eliminates any potential turbulence from the
space between the cabinet and the floor itself. Still, the
proximity to the floor ensures that the benefit of having a
down-firing subwoofer is maintained; a higher efficiency
and more freedom in positioning.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
WOOFER
DALI SUB C-8 D is equipped with an 8” down-firing
woofer. The cone is constructed from a high-quality
paper pulp resulting in a rigid cone with excellent
breakup characteristics while at the same time being
very lightweight and agile.
The engine of the woofer is built around an ‘oversized’
ferrite magnet and optimized for maximum flux within
the voice coil gap. The reason is that it was crucial for
the project team to reach a high B/L product to enable
the SUB C-8 D to render the finer low frequency details
of music, also at a higher sound pressure level. The
measured B/L value of 14 N/Ampere is a good indication
of the level of control and precision that was reached,
and rarely to be found in this category at all. And the
numerous listening sessions has truly convinced us that
this was the right way to go.
The voice coil is 26.5 mm long and built for long
excursions. It is vented to ensure air-cooling to the
system, and the coil itself. Venting this 4-layer voice coil
keeps the temperature down, and the benefit is a stable
impedance response.
Also, the pole piece is vented for maximum cooling. Here
the venting has another purpose too; it reduces internal
compression in the motor system. This ensures free
movement of the cone without any over/under pressure
affecting the performance.
Adhering to the low-loss sound design principle, the
surround of the woofer is built to allow long and linear
excursion. The oversized suspension is designed to allow
both weak and strong transients to turn into undistorted
acoustic signals.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
AMPLIFIER
The integrated 170 Watt RMS Class D amplifier is a
highly linear construction. The DALI SUB C-8 D will
follow and render the required signal with an absolute
minimum of bias. Designed not only for continuous
power, but also for peak power, this subwoofer is able to
deliver 220 Watt Peak Power. This is very relevant when
it comes to both movie and music signals.
The switch mode power supply is part of the reason for
very low power consumption - only 0.4 Watt in standby mode. And the amplifier displays an impressive
efficiency of 70%. In unison the high-efficiency amplifier
section and power supply construction generate an
absolute minimum of heat loss. For that reason you will
find no external heat sink on this subwoofer.
To improve sound reproduction in general, and to
ensure that this subwoofer can perform under difficult
circumstances, a limiter has been incorporated in
the amplifier section. The integrated limiter works in
two areas: It compares the input signal amplitude to
the potential output signal level, and it compares the
available supply voltage from the power supply to the
expected output signal. If any of these comparisons
show that there will be a problem then the limiter will cut
the signal in a soft manner and without affecting peak
power.
Fitted with controls for gain, cut-off frequency, and
phase, the DALI SUB C-8 D will adapt to any front
speaker and room acoustics. And with a choice of LFE
and LINE inputs it can be connected to almost any
amplifier, receiver or processor.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
APPLICATION
Placing a subwoofer is a very large part of creating the
perfect audio reproduction. DALI recommends placing
the SUB C-8 D in a corner or if that is not possible
alongside a wall. This will maximise the bass output and
the distribution around the room. The compact size of the
SUB C-8 D makes placing it correctly much easier than
many larger subwoofers.
Available in Black Ash and White, the SUB C-8 D is
the natural companion for many DALI speakers. Any
compact speaker from the SPEKTOR or ZENSOR series
will integrate perfectly with the SUB C-8 D, and the SUB
C-8 D will compliment surround setups from the same
series just as well.
And importantly; the design, technology, and
construction of this subwoofer makes it a perfect
upgrade of a speaker system of another brand. Whether
it’s a 2.1-, 5.1- or 7.2-channel system – or something in
between – the DALI SUB C-8 D will take natural sound
one step further.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
TECHNICAL SPECIFICATIONS
DALI SUB C-8 D
Frequency Range [+/- 3] dB [Hz] 33 – 200
Maximum SPL [dB] 109
Crossover Frequencies [Hz] 40 - 120
Low Frequency Driver(s) 1 x 8” long stroke
Low frequency driver, Diaphragm type Paper
Enclosure Type Bass reflex
Bass Reflex Tuning Frequency [Hz] 49
Max. Amplifier Power Output [RMS Watts] 220
Continous IEC Power Output [RMS Watts] 170
Input Impedance [kohm] 25
Connection Input(s) RCA, Stereo (low-pass filtered) LFE (Mono)
Magnetic Shielding No
Recommended Placement Floor, near wall or corner
Recommended Distance From Wall [cm] 10 - 30
Functions Crossover Frequency
Phase Switch
Standby (Auto Power)
On/Off Switch, Volume (Gain)
Max. Power Consumption [Watts] 250
Dimensions (H x W x D) [mm] 335 x 295 x 310
Weight [kg] 10.4
All technical specifications are subject to change without notice.
DALI A/S www.dali-speakers.comDALI SUB C-8 D
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