DYNAUDIO EVOKE 50 LOUDSPEAKERS
Great news! Dynaudio has trickled down one of the technologies it uses in its high-end loudspeakers to a totally affordable model. The ‘Hexis’ geometry Dynaudio developed specially for its Esotar3 tweeter—as used on the company’s Confidence range—is now fitted to the latest Dynaudio Evoke 50.
THE EQUIPMENT
It isn’t the exact same tweeter, of course, but the most important design element is the same, which is that the 28mm fabric dome sits just on top of a hidden ‘inner dome’ in a geometry that Dynaudio calls a ‘Hexis’— and if you look carefully at the fabric dome, you can just see the dimpled surface of the sub-dome underneath. According to the Alex Newman, one of the acoustic designers responsible for the Evoke series, the second dome enables better control of air pressure behind the fabric dome and because of this increased control, the company has been able to achieve an even-smoother frequency response from the tweeter.
The new tweeter also benefits from the tweeter Dynaudio designed for its ‘Special 40’ speaker, an anniversary model specifically developed to celebrate Dynaudio’s forty years in the loudspeaker business. In the centre of the Evoke 50 tweeter’s magnet is a specially-shaped vent and behind that magnet, a larger rear chamber. That larger chamber, in conjunction with the new pressure conduit, reduces the back-pressure on the rear of the tweeter diaphragm, effectively enabling enhanced frequency extension.
As for the magnet itself, that’s one of the major differences between it and the Esotar3. Whereas the Esotar3 tweeter is made from neodymium alloy—Nd2Fe14B—the Evoke 50 tweeter’s magnet is made from a less-powerful magnetic material made using strontium carbonate ferrite which Dynaudio calls ‘Cerotar.’
Although all the models in the new Evoke range use the same tweeter, the Evoke 50 is the only model in the range that has a dedicated midrange driver. And that midrange driver is a newly-developed model with an overall diameter of 150mm, a moving diameter (that is, the diameter of the cone and roll surround) of 120mm and a Thiele/ Small diameter of 115mm. Its single-piece polypropylene cone is only 0.4mm thick and is driven by an aluminium voice-coil wound around
