Therefore another approach is used. The  acoustic properties  of our loudspeaker  designs are based on stiffness by using 15 mm bituminized aluminum panels and lacks unity as the  panels are glued by using  rubber like adhesives. This approach plus  using the finest transducers available will give the design the most honest and color free presentation of the electrical equivalent.
Acelec monitors versus church bells
Church bells come under the general heading of tuned percussion instruments. A well-tuned bell gives a clear sense of a definite pitch when it is rung, because a few of the lower natural frequencies have been carefully adjusted to fall in harmonically related ratios . However, the role of these natural frequencies in determining the sound of bells is not the topic here.
Strangely enough, we are not interested in the behavior of a healthy church bell. What happens when a church bell is old and cracked, it will lose its beautiful sound because the unity in the used bronze has disappeared caused by the impact of the clapper over the years.

This behavior is exactly what we like by creating a loudspeaker cabinet as we do not like unity in the used material. For instance when wood or multiplex is used, the six panels of the cabinet are glued together. As a result the hardness of the glue creates unity  in the design and therefore becomes more resonant than the six panels separately. While having a reasonable internal damping, materials based on wood like Multiplex or MDF are not stiff enough. As a result  acoustic energy coming from the inside will find its way to the outside over time. Time related events in music (for instance percussive instruments) are smeared over time due to the absence of stiffness of the cabinet and possible ringing due to unity in the used material.
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