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Dynaudio Home Special Forty The Esotar Forty Advanced airflow tech behind the magnet reduces unwanted pressure for even better performance The cone itself uses a painstakingly developed symmetrical excursion for even better midrange performance. Behind it sits our asymmetrical spider – our 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. (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 integrated 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 crank the volume. Airflow is king It all sits in our special AirFlow Basket – the bit that holds the 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 compromising the basket’s stiffness or stability, and this genius design is what they came up with. The brand-new Esotar Forty tweeter takes air-movement to another level. It moves the air in typically sweet fashion in front of the DSR (Dynaudio Secret Recipe) precision-coated soft-dome, of course, but there’s a lot of advanced engineering going on behind it as well. Take the new pressure conduit. It’s a shaped vent in the back of the magnet system that allows more space in the rear chamber. That space lets us pack in more damping material to reduce back-pressure, while the shape itself optimises airflow coming backwards from the rear of the dome. Then there’s the outlet; the aero-coupled pressure-release system. It sits underneath the voice-coil and reduces unwanted pressure build-up that could affect its movement. Stopping those pockets of air from forming reduces resonance – and less resonance equals even greater potential for detail. Flux optimisation and beam control We love playing with the laws of physics. Physics wins in the end, of course (usually), but we almost always manage to bend it to our will along the way. Just like we have with our advanced magnet systems. The magnet turns electrical energy that flows from your amplifier into the voice-coil, into the physical back-and-forth movement of the driver diaphragm. These movements are very small and very fast (especially in the tweeter), so they need a lot of finesse if you want to hear all that luscious detail and emotion in your music. In the woofer, we’ve achieved that finesse in two ways: by placing the magnet inside the voice-coil, and by playing with magnetic energy itself. We love messing with the laws of physics. Physics usually wins, but we almost always manage to bend it to our will along the way 58 Dynaudio Magazine
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Dynaudio Home Special Forty Red or grey? We painstakingly laminate Finnish Birch veneers many, many, many times and cross-cut them to achieve this striking pattern. Then we use special stains to bring it out even further. Nice, isn’t it Other manufacturers typically put it around the outside edge, leaving the voice-coil hollow. Putting the magnet inside keeps the magnetic energy (or flux) in the optimum position for getting itself wrapped around the voice-coil – where it should be. That means we can use more of its power for a given weight. It also reduces internal reflections because there’s less material for sound to bounce off inside the driver. Second, we use a hybrid magnet for even greater control over the flux and voice-coil movement. An incredibly 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 done something special for 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. ■ Issue 02 59
