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Oliver,

It might be anything including electricity. Generally compression drivers are very much vulnerable to the electricity problems, muck more than convectional drivers. Let pretend that distortions in powers lines are responsible for worsening of sound (it would not be completely correct). They the amplitude of distortions of 5% would be a little above 5V and amplitude of .5% will be at sub 1V. Let presume that somehow those distortions (there the ground for instance) make to our loudspeakers at the level of .0000001% of signal. Now we have to take a compliance of the drivers under consideration. 

A regular direct radiation driver has relatively high cone mass, relatively high exertion, relatively high inertia and consequentially a relatively stiff suspension to control that mass. So, the direct radiation drivers have relatively high Minimum Current that those drivers need. The Minimum Current is the minimum amount of current that the driver need in order the defeat the stiffness of suspension. It means that if the driver is fed by less current then the Minimum Current then the changes in the current will be eaten by the driver suspension and the driver will be immune to comply and to convert those micro currants into the micro moves of the cone.

Then we have compression drivers. The cone mass is very little, the suspension is super stiff but not within the operational exertion. With exertion the suspension is virtually free and therefore compression drivers have way lower Minimum Current (ribbons have even lower). Now those .0000001% electrical distortion of signal that penetrated to speakers level are way more affective and impactful.

Cessaro if I am not mistake used TAD driver with beryllium diaphragm and neodymium mangers that push 2.4T in gap. With the tremendous force and ultra low mass of the beryllium cones the Minimum Current of the driver should be very-very low, so it is no surprise that Cessaro is very  subjected to the quality of electricity.

Anyhow, as I understand Cessaro showed at the show their small model. I do not particularly care about the sampler Cessaro – the model that I feel should be interesting is Gamma. The Cessaro Gamma is not without tribulations by design but it is the only Cessaro that in my view is worth efforts to listen.

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