DDM is abbreviation for Dual Diaphragm Matrix which actually use two individual drivers, one in front for exclusively High frequency reproduction while other in behind for Mid to Low frequency reproduction. The coaxial structure, allocate two drivers on one axis, is the appropriately technology introduced by Radius which brings a seamless wide range reproduction from the deep bass to the clear high.

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  • Piezo elements constructed on the multiple ceramic layers corresponds to the nature of Hi-Res music, even to the delicate quiet range.
  • Energy of low and mid range that is launched from the rear driver and come out through the holes on the piezo driver, fuse with high range energy on the same axis.
  • Newly designed Deep Mount earpiece. Its' unique shape provide tight fit to the ear canals providing a rich bass reproduction. Mounting position of the earpieces can be adjusted in two stages to achieve a more accurate musical reproduction without missing bass by optimizing their position. Furthermore, while increasing the sound insulation by the secure fit to their ears, they reduce stress on the ears. It is also recommended to use under the noisy environment such as commuting.
  • Detachable cable by introducing MMCX (micro-miniature coaxial) connector. Cable can easily replaced with new one in case of the failure event.
  • Includes elegant and exclusive carrying case.
  • NePlayer is recommended to use with for the excellent music listening experiencing

Main Features

DDM structure incorporated Earphones Doburube Numero HP-TWF31
カラー 品番 JANコード
Noir(Black) 品番HP-TWF31K JANコード4531465041537
Driver Type Dynamic + Piezo
Driver Size Dynamicφ13mm Piezoφ12mm(Dual diaphragm)
Output Sound Pressure Level 108±3dB/mW
Frequency Range 10Hz〜40000Hz
Max. Input 20mW
Impedance 32Ω
Connector Φ3.5mm gold plated stereo mini plug
Cable Length Approx. 120cm (Y Type)
Weight Approx. 17g (includes cable)


■4 sets of ear caps (XS/S/M/L)
 ■Cleaning cloth x1
 ■Headphone case x1
 ■User's Manual/Warranty