Genelec Minimum Diffraction Coaxial (MDC™) Driver Technology

Genelec MDC™ iconTypical to all current coaxial designs is somewhat ragged frequency response due to inherent diffraction problems. However, crossover issues due to non-coincident location of sources are solved with a coaxial configuration.

Here lay the seeds of Genelec’s Minimum Diffraction Coaxial (MDC™) solution: while it benefits from typical coaxial design advantages, it now overcomes their serious shortages as well.

The Genelec approach is basically simple: eliminate the root causes of the problems. The main structure of the MDC™ tweeter-midrange coaxial design consists of an integrated MF diaphragm-suspension-tweeter. The visible part of the coaxial driver is formed by the curved flexible foam surface with the coaxial dome tweeter assembly in its center. There is no conventional spider and the suspension is made of foam over the entire cone. The inner and outer suspensions are dimensioned in such a way that their possible non-linearities cancel each other, thus forming a very linear total suspension system.

8260A MDC technologyThe inner section joins the cone to the tweeter structure without any acoustical discontinuity, and the outer one does the same between the cone and the driver chassis. As there are no acoustically observable discontinuities between the tweeter and the cone, just a smooth surface, there is no diffraction either. The cone profile is very carefully optimized to form an integrated directivity control waveguide for the tweeter radiation. The driver outer edge is terminated to an advanced Genelec DCW™ waveguide in order to control the dispersion of midrange radiation as well.

This breakthrough in coaxial design provides improved imaging and overall sound quality on- and off-axis, extremely smooth frequency response leading to outstanding clarity and definition of the inner details of the music.

The Genelec 8260A Three-Way DSP Loudspeaker system combines, for the first time, a coaxial driver (MDC™) within a modern waveguide (DCW™), ensuring drivers to couple coherently over their full operating bandwidth as well as being single MF/HF coincident point source.

To summarize, the main novelties of Genelec combined DCW™ and MDC™ designs are:

  • Diffraction-free joint between tweeter and midrange diaphragm.
  • Diffraction-free joint between midrange diaphragm and DCW™ waveguide.
  • A proprietary midrange diaphragm technology – laminate structure combining a rigid cone and elastic, lossy materials including the suspension itself.
  • A midrange diaphragm-suspension pair which cancels all possible nonlinearities.
These technology advantages:

  • Lead to smoother frequency response.
  • Ensure the drivers to couple coherently over their full operating bandwidth.
  • Significantly improve the directivity control in the critical frequency range.
  • Provide balanced suspension dynamics to minimize acoustic distortion.
  • Optimize the use of the front baffle area while maintaining the 8000 series appearance and benefits.

MDC technology


> To learn more about Genelec MDC™ driver technology, read also our technical paper here.