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Owner's Manual Special Forty

Laurels aren't for resting on

Special Twenty-Five, the Crafft and the

We still surprise ourselves. Some people

Contour 1.3SE, we kept the Special

might be content to sit back and be

Forty pure – if incredibly advanced.

complacent about their successes after

40 years of constant innovation. We

Of course, it wouldn't be an anniversary

aren't. In fact, we only get hungrier for

speaker if it didn't include some of our

new techniques and technologies.

greatest hits. But we haven't just got

the old band back together to trot out

That's why we developed the Special

the same old stuff, unchanged. We've

Forty. We wanted to revisit those

remixed, remastered and rearranged

innovations and see what we'd do

things to bring those old favourites into

differently this time.

2017 – and beyond.

What you won't find here is anything

That's why it has one of our classic first-

revolutionary (check out our active

order crossover designs, incorporating

speaker range for that – you'll be

our unique Phase Alignment and

amazed). Instead, you'll discover a look

Impedance Alignment technologies.

at our past – along with some special

The crossover expertly marshals the

sneak-previews of the future.

input signal between the woofer and the

tweeter – so each driver gets only the

The Special Forty is classic Dynaudio:

frequencies it's supposed to, and can

all the craftsmanship, attention to detail

perform at its very best. Its specially

and total love of authentic sound you've

selected components handle the

come to expect. It's the connoisseur's

impedance optimisation and, because

choice – a simple pair of passive hi-fi

both drivers have extended frequency

speakers. But it isn't about looking back,

ranges for even better overlap and

misty-eyed, at past glories and leaving it

integration, that performance borders on

at that. It's about using those glories as

the mesmerising.

a platform from which to launch our next

set of breakthroughs.

The song remains the same

The Special Forty uses our proprietary

Greatest hits... reimagined

MSP (Magnesium Silicate Polymer)

We do compact speakers really well.

material for its main driver. MSP delivers

We always have. So, as a nod back to

precisely the right combination of

classics including the Special One, the

rigidity, damping and stability for the

most faithful sound reproduction. And,

unlike other cone materials, it doesn't

change over time – so your Special

Forty speakers will still be singing just as

sweetly come our next anniversary.

The cone itself uses a painstakingly

developed symmetrical excursion for

even better midrange performance.

Behind it sits a new Nomex spider – the

'suspension' for the voice-coil. It enables

for even more symmetry in the driver's

excursion – and makes it possible not

only to pick out individual parts in a

piece of music, but even individual

instruments in an orchestra. (So now,

finally, the Third Violin section can have

its day in the sun.) And, like all our other

MSP cones, it's a one-piece design

(you can tell by the special balance ribs

around the central dust-cap). This gives

it an incredibly solid connection to the

voice-coil, as well as stabilising its form –

which is crucial when you decide to turn

it up to 11.

It all sits in our special AirFlow Basket

– the bit that holds the whole driver

motor securely in place in the cabinet.

Its development was one of those

'Eureka!' moments our engineers seem

to get a few times a week in Dynaudio

Labs (you can often hear them cheering

from across the road in our factory). We

asked them to reduce internal reflections

and increase air movement without

(usually), but we almost always manage

compromising the basket's stiffness or

to bend it to our will along the way. Just

stability, and this genius design is what

like we have with our magnet systems.

they came up with.

The magnet turns electrical energy

Airflow is king

that flows from your amplifier into the

The new Esotar Forty tweeter takes

voice-coil, into the physical back-and-

air-movement to another level. It moves

forth movement of the driver diaphragm.

the air in typically sweet fashion in front

These movements are very small and

of the DSR (Dynaudio Secret Recipe)

very fast (especially in the tweeter), so

precision-coated soft-dome, of course,

they need a lot of finesse if you want to

but there's a lot of engineering going on

hear all that luscious detail and emotion

behind it as well.

in your music.

Take the new pressure conduit. It's a

Behind the woofer

shaped vent in the back of the magnet

In the woofer, we've achieved that

system that allows more space in the

finesse in two ways: by placing the

rear chamber. That space lets us pack

magnet inside the voice-coil, and by

in more damping material and reduces

playing with magnetic energy itself.

back-pressure, while the shape itself

optimises airflow coming backwards

Other manufacturers typically put it

from the rear of the dome.

around the outside edge, leaving the

voice-coil hollow. Putting the magnet

Then there's the outlet; the aero-

inside keeps the magnetic energy (or

coupled pressure-release system. It sits

flux) in the optimum position for getting

underneath the voice-coil and reduces

itself wrapped around the voice-coil –

unwanted pressure build-up that could

where it should be. That means we can

affect its movement. Stopping those

use more of its power for a given weight.

pockets of air from forming reduces

It also reduces internal reflections

resonance – and less resonance equals

because there's less material for sound

even greater potential for detail.

to bounce off inside the driver.

Flux optimisation and beam control

Second, we use a hybrid magnet for

We love playing with the laws of physics.

even greater control over the flux and

Physics wins in the end, of course

voice-coil movement. An incredibly

Meet The Special Forty

powerful neodymium rare-earth magnet

provides the muscle and flings flux

around with abandon, while a ferrite

magnet tempers that enthusiasm by

gently moving the flux back to exactly

where it's needed most. The result?

Symmetrical excursion, a reduction in

second-harmonics, and an even more

accurate, authentic sound.

Box clever

And then there's the finish. Whichever

veneer you've gone for – the Grey Birch

or the Red Birch, our designers have

given you a treat. We've always pushed

the boat out on our special anniversary

speakers – from the luscious bird's-eye

maple of the Contour 1.3 SE to the

Special Twenty-Five's stunning burled

birch and the Sapphire's amazing

Mocca, Bordeaux and Ivory veneers. The

Special Forty takes that to a new level.

We pushed our team to come up with

something different to the kind of thing

we've done in the past, and they took

that to heart. That's why they're raw;

visceral; striking. We wanted the Special

Forty to look as authentic and honest as

the music they're playing sounds.

Happy birthday to us! Enjoy the party

(help yourself to fastelavnsboller).