Resonance tuning of cabinets is critical because the cabinet´s main purpose is to provide the drivers the environment to perform at their best. In contrast to a musical instrument, in which the beauty of the sound is created by the resonant support lent by the body or cabinet, a speaker cabinet should be neutral, to the exclusion of additional resonances and vibrations. Our speaker cabinets are designed using the latest computer analysis techniques (Finite Element Analysis) and critical measurements to ensure that they are structurally inert, and extensive listening is conducted to verify the theories in practice.
One of our analysis techniques records the strength of vibrations with “accelerometers.” For example, cabinets are scanned to assess the location and amplitude of vibrations. As a result of using this technique to analyze many prototypes, we found that it is vital to the sound to spend extraordinary effort in finding the exactly defined and tested position of a bracing point. That´s why even a relatively small speaker like MOZART features two full-depth braces, forming three chambers, and two additional position-defined short-braces. A single, well-placed brace can reduce the radiation down to a tenth of the original level of the unbraced cabinet.
Obviously the front-baffle, housing drivers that produce astounding levels of energy, plays an important role and must offer true stability, which can be achieved by mass and stiffness. That´s why all of our speakers feature extraordinarily massive front-baffles, ranging from 30 mm (1.2 inches) up to 40 mm (1.6 inches), depending on the application.
An additional cause of potential sonic degradation, is the so-called “standing waves” within a cabinet. We were able to eliminate them through several means, one being the formation of chambers of three different lengths within cabinets (especially floorstanders). The chambers prevent a single wave from being amplified by three identical frequencies; moreover, these three lengths are in a proportion to even decrease one another. Furthermore, the cabinets are created with full-depth braces that are intentionally asymmetrical, dividing them internally into non-uniform shapes wherever possible. The cabinet division has an additional important effect: It limits the maximum lengths a standing wave has at its disposal, which is vital. We discovered through a series of tests that consistency and perfect positioning of the natural fibre internal damping can achieve only so much, because the damping materials are able to absorb solely mid and high frequencies, the higher the frequency the better the absorption. They are not able to absorb low frequencies, e.g., 100Hz. However, our small internal chambers prevent low frequencies (because the shorter the length of the wave, the higher the frequency), and as a result the damping material in our cabinets is able to absorb the rest of resonances.
In addition to all of the measures above for quieting the enclosures, there is another reason for making the cabinets as massive as we do – the internal pressure caused by the bass system is more easily controlled.
Some of our floorstanding models feature an additional hidden chamber, accessible through the base, that may be filled with sand for the final touch in system tuning. The sand increases mass and inserts thousands of energy absorbers (through the movement of the individual grains). This simple augmentation results in enhanced smoothness and clarity, for the ultimate in refinement.
Finally, all of our designs feature narrow front baffles, created so slim to minimize early reflections, allowing the sound to release freely into the room and thereby enabling holographic depth in imaging. Also, the baffles are carefully curved on all four edges to limit box-edge diffraction effects.