Discovery and application of "geometric resonance optimisation"
The danholt Boomerang is a turntable for analogue records.
As part of my own research, I am developing the theory of geometric resonance optimisation. Initially used as the basis of a design and construction principle for an analogue record player, further applications were to follow.
Analogue record players generally had damping systems. In elaborate and high-quality models, so-called sub-chassis were used - constructions standing or hanging on springs and dampers as well as very high inertial masses.
The danholt boomerang, on the other hand, is largely undamped. It is directly coupled to the respective surface via three conical metal cones. Its boomerang-shaped geometry alone, in combination with a sandwich of two metal plates and a solid wood fibre core, as well as the three conical feet made from solid metal, form a virtually resonance-free body. This geometry also ensures an optimum centre of gravity as well as moments of inertia under external excitation. This means that this record player can be gently lifted and moved by a person during playback, for example, without the stylus jumping out of the record groove. The realisation of an undamped construction, but without disturbing resonances, as was achieved with the danholt Boomerang, results in less energy loss, making music sound more dynamic and powerful.
In a test, the magazine "Stereoplay" confirmed the excellent sound and measurement values due to the geometry.
