The Special Forty is classic Dynaudio: all the craftsmanship, attention to detail and total love of authentic sound you’ve come to expect.
The Special Forty uses Dynaudio’s proprietary MSP (Magnesium Silicate Polymer) material for its main driver. MSP delivers precisely the right combination of 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 Dynaudio’s asymmetrical spider – their passive harmonic rectifier. It minimises upper harmonics to further tighten the performance and make it possible not only to pick out individual parts in a piece of music, but even individual instruments in an orchestra. And, like all their 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 Dyndaudio’s special AirFlow Basket – the bit that holds the whole driver motor securely in place in the cabinet.
The Esotar Forty Tweeter
This is exclusive to the Special Forty. It’s based on their other classic Esotar designs but has refinements behind the scenes. Behind the diaphragm in the magnet is a new pressure conduit – a specially shaped vent that lets them devote more space to the rear chamber and controls how the air moves from the back of the diaphragm into that space. The chamber itself is packed with more damping material and, in conjunction with the pressure conduit, serves to reduce back-pressure on the rear of the tweeter diaphragm.
There’s an aero-coupled pressure-release outlet under the tweeter’s voice-coil. It equalises the pressure immediately under the voice-coil with that outside to reduce any air pockets that could stop the coil moving as it should. This reduces resonance – and manifests itself in the form of more detailed performance. The Esotar Forty’s 28mm diaphragm is a classic Dynaudio soft-dome design, complete with their DSR (Dynaudio Secret Recipe) precision coating. This coating is applied in exactly the correct places and thicknesses to optimise high-frequency performance.
The unit is suspended in magnetic ferrofluid to increase power-handling, improve the dome’s excursion and absorb unwanted heat and excess energy. And that, in English, means a tighter, more controlled and more honest performance.
Their Best Ever 17cm Woofer
The Special Forty woofer is based on Dynaudio’s classic 17W75 MSP model. This one has an improved spider and specially optimised excursion-symmetry. Once again they are using their proprietary MSP (Magnesium Silicate Polymer) material: nothing else they’ve encountered so far offers its precise combination of stiffness, stability, rigidness and damping. And unlike some other cone materials, its properties don’t change over time.
Like all their other MSP woofers, the Special Forty’s driver is a one-piece design. You can tell by their trademark Balance Ribs around the central dome. Making it a single structure gives them more control over how the cone deforms as it moves, and also gives the whole area a direct connection to the voice coil. The coils former is bonded directly to the back of the ring where the Balance Ribs sit – making the dome part of the playing surface. This is so they can extend the woofer’s frequency response upwards. It can easily handle frequencies up to around 4000Hz.
• Brand-new Esotar Forty tweeter – unique to this speaker
• Dynaudio’s best 17cm woofer yet
• Drivers have extended frequency ranges for incredible overlap and integration
• The woofer’s hybrid magnet system
• Aluminium voice-coils
• Improved airflow with the AirFlow Basket, plus-shaped vents and pressure conduits
• Classic Dynaudio first-order crossover