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| from http://www.sonicstudios.com/mdr-f1.htm |
It has been 10 years since the release of the last generation of Sony's CD-series headphones. While Sony MDR-CD2000 is featuring a Vectran-bio cellulose composite diaphragm, MDR-CD780 simply utilizes a PET diaphragm, while sharing most of the technical specifications with its sibling. Although CD-series mainly consists of a closed-air/closed-back design, this generation adapts a radical open-air/open-back configuration, like that of MDR-F1, for better airiness, but with more isolation and comfort.
CON: Short bandwidth, high level of harmonic distortion in the bass, and the ringing at 10 kHz.
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