High Frequency Driver

HDF 140


140 Watt Power

1.5 inch Throat Exit

74.5 mm (2.5mm) Voice Coil

900 KHz to 20 KHz

109 dB 1w@1m Sensitivity

Ferrite Magnet Structure


Throat Diameter mm/in 38/1.5
Power Handling Capacity w(AES) 140
Max Power watts 8-Jun
Nominal Impedance ohms 16-Aug
Sensitivity (1W/1M) dB 109
Frequency Range Hz 900 To 20K
Voice Coil Diameter mm/in 74.5/3
Re ohm 5.5 – 11.5
Flux density T 2
Diaphragm  Titanium + PEEK
Voice coil Copper Clad Aluminium
Magnet material Ceramic


Boltcircle Diameter mm 4x M6 holes
Over all diameter mm 170
Overall Depth mm 70
Net weight Kg 4.7

  • Frequency Response & Impedance Magnitude Curves


  • Dimension Drawing

▪Aes Power Is Measured with 6db Creat Factor Continuous Pink Noise in 2 Hours Duration
▪Max Power Is Defined as 3dB Higher than the Nominal Rating
▪Sensitivity Is Measured at One Meter at 2.83v and 8 Ohm Nominal Impedance
▪All Measurement of the Speakers Is Done After a Sufficient High Level of 20hz Sine Wave Test
▪Xmas Is Defined at Tahe BL Drops by 18% of the Original Figure