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Description
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.
Features
- 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
Specifications
| General specifications | |
| Exit Throat Diameter | 1.4 inch / 36 mm |
| Related Impedance | 8 ohm |
| Program Power (watt) | 280 W |
| Power handling capacity | 140 W |
| Sensitivity | 110 dB |
| Frequency range | 500 - 20000 Hz |
| Diaphragm Material | Pure Titanium |
| Suspension Material | Polyimide |
| Suspension Design | Flat |
| Minimum Impedance (ohm) | 8.50 ohm |
| Voice Coil Diameter | 4.0 inch / 102 mm |
| Voice Coil Winding Material | Edgewound Aluminum |
| Voice Coil Former Design | Direct Drive Kapton |
| Number of layers | 1 |
| Kind of layers | outside |
| Flux Density | 2.0 T |
| Phase Plug Design | 4 slot |
| Phase Plug Material | Aluminum |
| Magnetics | Neodymium |
| Voice Coil Demodulation Ring | Copper |
| Thiele - small parameters | |
| Bl factor (Bl) (T x m) | 17.60 T x m |
| Mounting information | |
| Overall diameter | 140 mm / 5.51 inches |
| Overall height | 60 mm / 2.36 inches |
| Mounting | 4 x 6 mm threaded holes at 90° |
| Standard compliance | |
| Safety agency | CE compliant |
| Size / Weight | |
| Weight | 2.72 kg / 6 lbs |
| Shipping information | |
| Package Height | 79 mm / 3.11 inches |
| Package Width | 169 mm / 6.65 inches |
| Package Depth | 171 mm / 6.73 inches |
| Package Weight | 2.87 kg / 6.33 lbs |