ND940
DRIVER
  • 4.0 inch, Kapton former, edge wound aluminium voice coil
  • 280W continuous program power handling
  • Frequency range: 500Hz - 20kHz
  • 4-slot optimized geometry phase plug
  • 4.0 inch, Kapton former, edge wound aluminium voice coil
  • 280W continuous program power handling
  • Frequency range: 500Hz - 20kHz
  • 4-slot optimized geometry phase plug
  • Titanium diaphragm, Polyimide surround
The ND940 is a ultra compact size, high performance, high power handling 4.0-inch diaphragm compression driver with a 1.4 inch exit throat.
A thin copper ring is precision pressed on to the pole piece in order to modify and lower the inductance characteristics of the magnetic circuit and voice coil providing a controlled extension of the acoustic frequency response. The voice coil assembly is designed using a high strength, high temperature Kapton® voice coil former and edge wound copper clad aluminium wire directly joined to the diaphragm by RCF proprietary Direct Drive kapton technology. The ND940 features a 4-slot, optimised geometry, phase plug design. Extended computer assisted mathematical modelling and testing has resulted in a geometry that provides a balanced acoustic performance controlling and lowering air distortion and maximizing output.

Part Number:

  • 15129053
    ND940
    8ohm
Specifications
General specifications
Diaphragm Material:
Pure Titanium
Exit Throat Diameter:
1.4 inch / 36 mm
Flux Density:
2 T
Frequency range:
500 - 20000 Hz
Kind of layers:
outside
Magnetics:
Neodymium
Minimum Impedance:
8.50 ohm
Number of layers:
1
Phase Plug Design:
4 slot
Phase Plug Material:
Aluminium
Power handling capacity:
140 W
Program Power:
280 W
Related Impedance:
8 ohm
Sensitivity:
110 dB
Suspension Design:
Flat
Suspension Material:
Polymide
Voice Coil Demodulation Ring:
Copper
Voice Coil Diameter:
4.0 inch / 102 mm
Voice Coil Former Design:
Direct Drive Kapton
Voice Coil Material:
Edgewound Aluminium
Mounting Information
Mounting:
4 x 6 mm threaded holes at 90°
Overall diameter:
146 mm / 5.75 inches
Overall height:
60 mm / 2.36 inches
Shipping informations
Package Depth:
170 mm / 6.69 inches
Package Height:
90 mm / 3.54 inches
Package Weight:
3.3 kg / 7.28 lbs
Package Width:
195 mm / 7.68 inches
Size
Weight:
3.3 kg / 7.28 lbs
Standard compliance
CE marking:
Yes
Thiele - small parameters
BL factor (BL):
17.60 T x m
.