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Actually no one has ever asked us this, but it is an interesting and important question. The DDD driver puts less energy into the cabinet than an equivalent conventional driver would. This reduces cabinet resonances and gives a major increase in transparency. There are two reasons for this: a. The DDD driver has a very low moving mass, much less than most equivalent conventional drivers*, therefore the reaction forces it produces are much smaller and so there is less energy to cause resonances. b. The second reason is the way the DDD driver is mounted. On conventional loudspeakers, the driver is generally mounted on a baffle and the reaction forces the driver produces are in the same direction that the baffle would naturally want to flex. This makes it easier to excite resonances. By contrast, on the German Physiks Unlimited, HRS-130, Borderland Mk IV, Carbon Mk IV and Unicorn, the DDD driver is mounted on top of the cabinet. The reaction forces the DDD driver produces are therefore at right angles to the direction that the cabinet panels would naturally want to flex, so it is very difficult for the energy from the DDD driver’s reaction forces to make the cabinet panels flex. On the German Physiks PQS-203 to Gaudi, the DDD drivers use small cylindrical enclosures, minimising the area of any potential vibrating surface. By being cylindrical, they eliminate the resonances that can arise with a conventional rectangular or square section cabinet. Because they are made from aluminium, a comparatively soft metal, residual vibration of the enclosure is minimised due to the damping effect of the aluminium. The DDD driver enclosure end-caps are made from non-resonant MDF and the enclosure is packed with damping material to dissipate any standing waves. *The DDD driver can move as much air as a conventional 6.5-inch driver.
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