The OPTICON series has been at the heart of the DALI
range for over five years and has brought exceptional DALI
performance into the homes of countless music lovers
and audiophiles. But the time has come for the OPTICON
to benefit from some new ideas and technologies, and to
be refreshed with a new aesthetic. Welcome to the DALI
OPTICON MK2.
Eectively updating and improving such a well regarded high
performance series as the OPTICON is a careful balancing
act. How to enhance the existing engineering, aesthetics
and performance without degrading or even eradicating
the qualities that worked so well the first time around? The
answers to that conundrum are numerous, and range from
subtle revisions to more fundamental changes, but they
have all been implemented the DALI way, with a continual
focus on music reproduction, thoughtful design, slish
aesthetics, quali of manufacture and use of the latest
technologies and ideas.
As with the original OPTICON series, an important element
of the OPTICON MK2 is that it remains fully Danish
in manufacture; built at our factory in Denmark from
components either produced in-house, or sourced from
the best specialist manufacturers locally and further afield.
Just like its predecessor, the OPTICON MK2 is a speaker
series that majors on clear, undistorted, enjoyable and
coherent audio; perfectly complementing music, radio,
streaming, TV or movie sources. A speaker series that
caters to every requirement with compact stand or wall
mount options, slim to more substantial floor stand options,
and a centre channel option too. The OPTICON MK2 series
oers a speaker for every room and every occasion.
DALI A/S www.dali-speakers.comDALI OPTICON MK22
Page 3
2. The OPTICON MK2 Series
The DALI OPTICON MK2 series comprises six models and
marks the point in the DALI passive speaker range where
both performance and engineering ambition take a real step
up and begin to speak the language of specialist, high-end
hi-fi. OPTICON MK2 also introduces the renowned DALI
hybrid tweeter, die-cast aluminium driver chassis, full SMC
driver pole-pieces, and in-house manufactured enclosures.
Each OPTICON MK2 model is built around in-house
manufactured SMC based bass/midrange drivers, and
employs either a DALI so dome tweeter or the hybrid so
dome and ribbon tweeter for which DALI has become so
Cabinet: Satin Black
Grill: Black
Cabinet: Satin White
Grill: Light Grey
well known. OPTICON MK2 models are available in three
new finishes; satin white, satin black, and tobacco oak*.
Grilles are covered with furniture grade cloth in black for
the two darker enclosure options and light grey for the
white enclosure option. The OPTICON MK2 models are
described in the following paragraphs.
* The OPTICON8MK2 is available in
Satin Black Ash and Tobacco Oak only.
Cabinet: Tobacco Oak
Grill: Black
OPTICON
1 MK2
OPTICON
2 MK2
OPTICON
6 MK2
OPTICON
8 MK2
OPTICON
LCR MK2
OPTICON
VOKAL MK2
DALI A/S www.dali-speakers.comDALI OPTICON MK23
Page 4
OPTICON1MK2
The OPTICON1MK2 is a compact stand mount
speaker designed to be installed close to room
boundaries or wall mounted in modest listening
spaces. Its drivers comprise a 4¾” Wood Fibre
diaphragm, SMC magnet bass/midrange unit and a
newly designed 29mm so dome tweeter derived
from that employed in the CALLISTO series. The
Dual Flare reflex loaded 5 Litre enclosure enables
the OPTICON1MK2 to deliver remarkable bass
performance for its size that integrates perfectly
with the inherent midrange and high frequency
quali of its drivers. The OPTICON1MK2 is
supplied with a simple keyhole slot wall mounting
bracket.
OPTICON2MK2
The OPTICON2MK2 is a mid-sized
stand mount speaker. Its 6½” Wood Fibre
diaphragm, SMC magnet bass/midrange
driver and 10 Litre enclosure enables
it to achieve greater low frequency
bandwidth and volume level than its smaller
sibling. It features the same CALLISTO
derived 29mm so dome tweeter as the
OPTICON1MK2. The OPTICON2MK2
is a natural for high performance stand
mount audio in compact to medium size
listening spaces where it has room to
breathe and deliver its dynamic and
explicitly defined performance.
DALI A/S www.dali-speakers.comDALI OPTICON MK24
Page 5
OPTICON6MK2
The slim, floor-standing OPTICON6MK2 is
the entry point in the OPTICON MK2 series
for the renowned DALI hybrid so dome and
ribbon tweeter. The hybrid tweeter oers a
significant advance in high frequency resolution
and has been improved for OPTICON MK2
by incorporating the CALLISTO derived
29mm dome alongside a 17mm x 45mm ribbon
element in a re-engineered, cast aluminium
faceplate. OPTICON6MK2 low frequencies
and midrange are handled by twin 6½” Wood
Fibre diaphragm, SMC magnet bass/midrange
drivers, the lower one of which is gradually
aenuated into the midrange band.
The OPTICON6MK2 oers optional bi-wiring
to enable its bass/midrange and high frequency
sections to be connected independently.
Twin bass drivers, Dual Flare reflex loading,
and the increased internal volume provided
by its floor standing enclosure enable the
OPTICON6MK2 to achieve significantly
greater low frequency extension and bass
volume level than the stand mount OPTICON
MK2 systems. And it combines that bass
performance with brilliant, midrange clari
and the sparkling high frequencies that are
characteristic of the DALI hybrid tweeter.
The OPTICON6MK2 is supplied with cast aluminium
foot components that can be fied with either black
chrome plated floor-spikes or, when installed on
sensitive floor surfaces, vibration damping pads. Tools
for aaching the foot castings and spikes are included.
DALI A/S www.dali-speakers.comDALI OPTICON MK25
Page 6
OPTICON8MK2
The large-scale, floor-standing
OPTICON8MK2 is the powerhouse of the
new OPTICON MK2 series. It is the sole three-
way system in the series. It combines two 8”
Wood Fibre diaphragm, SMC magnet bass
drivers with a 6½” Wood Fibre diaphragm,
SMC magnet system midrange driver. The
OPTICON8MK2 oers optional bi-wiring to
enable its bass and midrange/high frequency
sections to be connected independently. The
driver array of the OPTICON8MK2 locates
the midrange and hybrid tweeter drivers
between the two widely spaced bass drivers.
This is done firstly in order to position the mid
and high frequency drivers near pical seated
ear height, and secondly to take advantage of
the smoother low frequency room response
that results from spaced bass drivers. The
OPTICON8MK2 driver array helps make
room positioning easier. Above the midrange
driver, the OPTICON8MK2 incorporates a
DALI hybrid tweeter that combines the new,
CALLISTO derived 29mm so dome driver
alongside a 17mm x 45mm ribbon element.
The OPTICON8MK2 enclosure incorporates
separate internal sections for each driver
with non-parallel dividing panels suppressing
internal resonance and also significantly
aiding enclosure rigidi. Each low frequency
section is fied with its own Dual Flare reflex
port. Thanks to its size and true three-way
format, the OPTICON8MK2 oers a level
of performance unavailable from any other
OPTICON model. It combines immense low
frequency bandwidth, volume potential and
dynamic accuracy with the extraordinary
detail and clari that arises from the use of a
dedicated midrange driver. High frequencies
from the hybrid tweeter are explicitly detailed
and informative yet simultaneously smooth and
endlessly listenable.
The OPTICON8MK2 is supplied with cast aluminium
foot components that can be fied with either black
chrome plated floor-spikes or, when installed on
sensitive floor surfaces, vibration damping pads. Tools
for aaching the foot castings and spikes are included.
The OPTICON8MK2 is available in
Satin Black Ash and Tobacco Oak.
DALI A/S www.dali-speakers.comDALI OPTICON MK26
Page 7
OPTICON LCR MK2
The OPTICON LCR MK2 combines the best of all the OPTICON MK2 technologies in a low profile, wall mounted multipurpose enclosure that can work wonders in le channel, right channel and centre channel roles. The OPTICON LCR
MK2 has everything covered – from conventional stereo through TV audio to multi-channel home theatre applications.
Its ingenious, wall assisted reflex port system works in synergy with its 6½” Wood Fibre diaphragm, SMC magnet bass/
midrange driver and its rotatable hybrid tweeter module to deliver an all round performance that truly belies its compact
dimensions. With airy high frequencies, expressive midrange and surprisingly extended bass, the OPTICON LCR MK2
is an on-wall speaker that delivers genuine hi-fi performance.
OPTICON VOKAL MK2
The OPTICON VOKAL MK2 brings a 6½” Wood Fibre diaphragm, SMC magnet bass/midrange driver and the DALI hybrid
tweeter together in an enclosure format designed specifically for centre channel applications in multi-channel audio-visual
systems. The OPTICON VOKAL MK2 enclosure dimensions and proportions are specifically configured to enable its
installation in audio-visual furniture units, and its front facing reflex ports mean that even fully enclosed mounting is feasible.
The OPTICON VOKAL MK2 is specifically voiced to play the centre channel role, but at the same time it displays all the
characteristic qualities that enable it to dovetail perfectly in a full OPTICON MK2 audio visual system.
DALI A/S www.dali-speakers.comDALI OPTICON MK27
Page 8
3. OPTICON MK2 Bass and Midrange Drivers
The OPTICON MK2 bass and midrange drivers were
designed with a consistent focus on the DALI audio
principles of low-loss, low distortion and low colouration.
The ideal driver plays only what the amplifier requires, with
nothing added and nothing subtracted, and at DALI we
strive to design and manufacture drivers that approach the
ideal as closely as possible.
Every component in each OPTICON MK2 bass/mid driver
is carefully designed for its positive contribution towards
ideal performance. The EPICON derived diaphragms are
made from a mix of paper and wood fibre that ensures
minimal break-up resonance and gives the diaphragms
their distinctive colour. They are terminated by rubber
surrounds chosen for their so and very flexible
mechanical properties that enable free movement with
minimal low frequency damping. In any bass/mid driver, it
is the magnet and voice-coil system that is best placed to
control and damp diaphragm movement. The job of the
surround is simply to dissipate, without resonance, the
vibrational energy flowing outward in the diaphragm; the
less it interferes with low frequency damping the beer.
The OPTICON MK2 bass and midrange driver chassis
are manufactured in die-cast aluminium that provides
extremely high rigidi and low resonance along with minimal
extraneous influence on the internal magnet system. The
mechanical design of the chassis is specifically engineered
to provide minimal impedance to airflow while at the same
time enabling extremely tight mechanical bonding with the
speaker enclosures.
The OPTICON MK2 bass/mid driver magnet system
consists of a large ferrite ring magnet surrounding a pole
piece manufactured entirely of the unique DALI SMC
material. The pole piece and the ferrite magnet are secured
between so iron front and back plates to create the
appropriate magnetic field for the voice-coil.
DALI A/S www.dali-speakers.comDALI OPTICON MK28
Page 9
DALI SMC (So Magnetic Compound) is a coated magnet
granular material that can be formed to almost any desired
shape and has many advantages used in driver magnet
systems. SMC’s unusual combination of very high magnetic
permeabili and very low electrical conductivi is exactly
what is required for driver magnet systems and results in a
significant reduction of electro-acoustic distortion.
low-frequency roll-o suited to installation in compact
listening spaces, the OPTICON8MK2 oers a much more
extended low frequency profile that suits installation in
large listening spaces with more distant room boundaries.
These considerations of low frequency voicing have been
revised in the OPTICON MK2 series to provide improved
integration with listening spaces and to take further
advantage of the newly introduced Dual Flare reflex ports.
SMC works primarily by minimising eddy currents in the
magnet system pole piece. Eddy currents arise through
the movement of the voice-coil around the pole-piece and
create a secondary magnetic field that modulates the
input signal and results in increased levels of harmonic
distortion. In addition to reducing distortion through eddy
current reduction however, SMC also improves flux lineari
within the magnet system, reduces magnetic hysteresis,
and minimises the variation of voice-coil inductance with
position. All of these SMC benefits together produce a
significant subjective reduction of low-level detail masking
and colouration.
The bass and bass/mid drivers in each OPTICON MK2
system are finely adjusted in terms of mechanical, magnetic
and electrical parameters to work with each speaker’s
enclosure volume, internal damping and Dual Flare port
tuning to result in a low frequency response profile ideally
suited to their likely installation. For example, where the
OPTICON1MK2 oers a relatively early but gradual
Along with the optimisation of bass driver low frequency
parameters, OPTICON MK2 midrange driver
characteristics are engineered to optimise integration
with the so dome and hybrid tweeters. In particular, the
midrange response shape of the Wood Fibre diaphragms
contributes to the overall filter characteristics of the
driver and crossover together. The driver and crossover
eectively work as one.
The fine grain SMC material
is an important building
material in the materialization
of the high performance
magnet system.
DALI A/S www.dali-speakers.comDALI OPTICON MK29
Page 10
4. OPTICON MK2 So Dome and Hybrid Tweeters
SOFT DOME TWEETER
The CALLISTO derived 29mm so dome tweeter used
in all six OPTICON MK2 systems is a new design that
oers significant advances over the two dierent so
dome tweeters used in the previous OPTICON series.
Its relatively small increase in diameter over the previous
28mm tweeter may seem a minor detail, however it results
in a significant increase in dome radiating area which means
lower distortion, higher power handling, and an abili to
operate at lower frequencies. Use of the same so dome
tweeter across all six OPTICON MK2 models not only
results in consistency of tonal character, but also enables
similar crossover topology to be used on each model so
providing consistency of dispersion characteristics.
The new OPTICON MK2 so dome tweeter enables
crossover frequencies as low as 2kHz to be safely
employed with no risk of distortion or power handling
limitations. The tweeter is equipped with high flux saturation
and very low-viscosi ferro-fluid in its magnet gap which
provides increased power handling and resonance damping
without slowing the impulse response speed of its ultra-light
coated diaphragm.
HYBRID TWEETER
DALI has a long and successful tradition for engineering
and integrating hybrid tweeter modules comprising a so
dome element working together with a ribbon element.
The OPTICON 6, 8 LCR and VOKAL MK2 systems employ
a new hybrid tweeter design that marries the CALLISTO
derived 29mm so dome element with a custom designed
17mm x 45mm ribbon element mounted on a cast aluminium
faceplate. The faceplate incorporates dispersion control
detailing, and the ribbon diaphragm itself is isolated from
internal enclosure pressure changes via a damped and
braced rear chamber.
The hybrid tweeter system is configured such that the
ribbon element begins to contribute from 10kHz upwards;
just as the response of the so dome element is beginning
slowly to fall away and become more directional. The ribbon
element both extends the system frequency response
towards 30kHz and contributes to keeping high frequency
horizontal dispersion wider than would otherwise be the
case. The new hybrid tweeter literally oers the best of
both worlds – the clari, speed and dynamics of a dome
tweeter, with the very high frequency detail and smooth
finesse of a ribbon tweeter.
CALLISTO tweeter for
illustrative purpose.
DALI A/S www.dali-speakers.comDALI OPTICON MK210
Page 11
5. OPTICON MK2 Reflex Ports
All six OPTICON MK2 models are reflex loaded speakers.
Reflex loading employs the otherwise unused acoustic
output from the rear of a bass driver to extend low
frequency bandwidth and increase low frequency power
handling. It achieves this by using an appropriately tuned low
frequency resonance (the reflex port) eectively to reverse
the phase of the rearward output of the bass driver so that
it adds to the forward output. Reflex loading is not a ‘free
lunch’ however and if not carefully considered, with the port
tuning frequency and set exactly right for the drivers and
enclosure volume, it can result in unnaturally emphasised
and audibly ‘slow’ bass. For all the OPTICON MK2 models
we revisited the port tuning in the context of all the MK2
revisions to ensure that the subjective bass performance
of each one is absolutely optimised for its likely installation
application.
The design of speaker reflex ports is a far more complex
problem than perhaps it appears, and with the OPTICON
1, 2, 6 and 8 MK2 we took the MK2 opportuni to
incorporate our Dual Flare port technique. The problem
with reflex ports is that to work optimally, the airflow
through them must remain smooth and laminar (like a gently
flowing river, rather than rapidly churning white water), but
as bass volume levels increase, port turbulence can quickly
arise, with potentially audible compression and distortion as
a result.
The newly introduced OPTICON MK2 Dual Flare technique
brings port design into the realm of aerodynamics with exit
and entry flares carefully designed to minimise turbulence
at the airflow rate expected from the port diameter and
tuning frequency. Dual Flare enables OPTICON MK2 reflex
ports to remain laminar and work eectively to reinforce
low frequency performance to a significantly higher volume
level than would otherwise be the case.
The reflex ports employed in the OPTICON LCR and
VOKAL MK2 are not Dual Flare designs, however their
ports are no less carefully considered. In the case of the
OPTICON VOKAL MK2, it employs twin, forward facing
leerbox sle reflex ports configured to enable the
system to be enclosed in furniture units. Not only does its
enclosure format not provide enough space for Dual Flare,
port flaring is less critical on a system designed primarily for
voice reproduction.
In the case of the OPTICON LCR MK2, its on-wall
installation requires an entirely dierent reflex port
approach. Its reflex port exits are located in the rear panel
and engineered to vent in parallel to the wall. The rear wall
surface eectively becomes integral to the port tuning and
exit flaring.
Dual flare
SINGLE flare
no flare
DALI A/S www.dali-speakers.comDALI OPTICON MK211
Page 12
6. MANUFACTURING IN PAIRS
There’s many respects in which DALI stands out among the
crowd of HiFi speaker manufacturers, but one in particular
is our approach to pair matching – in terms of both
acoustics and finish quali.
DALI has highly eective quali assurance systems
that ensure tight tolerances and minimal deviation from
reference standards, but not even optimal quali control
can always fully regulate some of the natural materials
fundamental to speaker manufacture – the colour nuance
of veneers, for example, will vary slightly over time.
So DALI manufacturing processes are designed around
the idea that speakers used and enjoyed in pairs should
also be built as pairs! So our process ensures that stereo
pairs of speakers are built and tested sequentially by a
single manufacturing technician, using components taken
in the same order from the same batch. It’s a process
that not only helps ensure ultimate acoustic pair matching,
but it means also that the small details that make such a
dierence to quali and pride of ownership are properly
aended to.
Examine a pair of HiFi speakers from many manufacturers
and you’ll almost certainly see that they each have dierent
serial numbers, oen some numerical distance apart. This
indicates that manufacturing may have taken place months
apart; perhaps even on dierent production lines. Examine
a pair of DALI speakers however and you’ll see that they
carry the same serial number, with just a simple extension
to denote Le or Right. It’s a simple approach that costs
very lile, yet it results in huge benefits for the customer.
DALI A/S www.dali-speakers.comDALI OPTICON MK212
Page 13
7. OPTICON MK2 Crossover
Integrating the output of the separate drivers in a multidriver speaker system is the primary job of the crossover,
but the crossover is also fundamental in defining both
the wide-band and fine tonal balance of the speaker - its
characteristic subjective ‘voice’. Crossovers are a DALI
speciali and we habitually spend numerous R&D hours
meticulously fine tuning and optimising each crossover
element to squeeze every grain of performance out of each
speaker system.
For all the OPTICON MK2 models we returned to first
principles and started afresh with crossover design to
ensure that the theoretical benefits of the new drivers
would be fully realised in the subjective performance
of the systems - working with the natural response
characteristics of the drivers rather than against them.
We also worked hard to make the filter topology as simple
as possible with the minimum of components between
the amplifier and drivers. Furthermore, as part of the
crossover design exercise, we made sure to upgrade the
quali of some individual crossover components – lower
loss capacitors in particular. The result is a noticeable
increase in overall coherence, detail and precision across
the entire OPTICON MK2 series.
The crossover assemblies in each OPTICON MK2 speaker
are located internally adjacent to the terminal panels in
order to shorten signal paths, and on the OPTICON 6 and
8 MK2 models the terminal panels incorporate optional biwiring facilities. The connection terminals on all OPTICON
MK2 models are gold plated to ensure long term reliable
connections.
OPTICON 6 MK2 cross over.
DALI A/S www.dali-speakers.comDALI OPTICON MK213
Page 14
8. OPTICON MK2 Cabinets
Manufacture of the OPTICON MK2 series has been
retained firmly at DALI in Denmark. Our in-house
woodworking facili handles everything from cuing and
routing the MDF enclosure panels to applying the surface
finishes and constructing the enclosure carcasses. Driver
and crossover installation and final test and quali approval
on each and every speaker is also handled on our own
assembly lines.
Each OPTICON MK2 enclosure is designed to optimise
rigidi and minimise panel resonance. The OPTICON MK2
25mm thick front baes provide massively rigid foundations
for the drivers, and the floor standing OPTICON MK2
models employ extra internal bracing further to ensure
rigidi and practically eliminate panel resonance. To ensure
the most secure aachment on the bass/midrange drivers
and their integration with the enclosure, their five mounting
holes are located along the arms of their driver chassis.
Furthermore, the internal profile of the bass/midrange
driver bae cut-outs is relieved between the fixing points to
provide clearer airflow space behind the driver diaphragms.
The new OPTICON MK2 cast aluminium tweeter faceplates
are held securely in place with four or six screws to
minimise the possibili of vibration and resonance.
OPTICON MK2 front grilles are aached via inserts
integrated elegantly into the tweeter and bass/mid driver
faceplates and chassis. This sle of aachment secures
the grilles in a manner that eliminates the possibili of
resonance and also leaves the bae surface aesthetically
clean without unnecessary and distracting visual features.
The OPTICON MK2 finishing laminates are among the finest
available and extensive testing was undertaken to ensure
that their surfaces and the enclosure joints will withstand
significant ambient temperature and humidi changes.
And through strict in-house control of every aspect of
manufacture, the OPTICON MK2 series achieves levels of
fit and finish pically found only at significantly higher price
points.
DALI A/S www.dali-speakers.comDALI OPTICON MK214
Page 15
9. OPTICON MK2 Update Summary
•
Fresh and elegant aesthetic with new satin white, satin
black and tobacco oak finish options matched with new
furniture grade grille fabrics.
•
New Woofers and Midrange drivers with SMC technology
and DALI EPICON derived Wood Fibre Diaphragms.
•
New, larger diameter in-house designed and
manufactured so dome tweeter derived from the
DALI CALLISTO.
•
Hybrid, so dome and ribbon tweeter on the OPTICON
6 -, 8- , LCR- and VOKAL MK2.
•
New die-cast aluminium tweeter faceplates.
•
DALI Dual Flare reflex ports for reduced port turbulence
and noise.