- 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.
- General specifications
- Exit Throat Diameter: 1.4 inch / 36 mm
- Related Impedance: 8 ohm
- Program Power: 280 W
- Power handling capacity: 140 W
- Sensitivity: 110 dB
- Frequency range: 500 – 20000 Hz
- Diaphragm Material: Pure Titanium
- Suspension Material: Polymide
- Suspension Design: Flat
- Minimum Impedance: 8.50 ohm
- Voice Coil Diameter: 4.0 inch / 102 mm
- Voice Coil Material: Edgewound Aluminium
- 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: Aluminium
- Magnetics: Neodymium
- Voice Coil Demodulation Ring: Copper
- Thiele – small parameters
- BL factor (BL): 17.60 T x m
- Mounting Information
- Overall diameter: 146 mm / 5.75 inches
- Overall height: 60 mm / 2.36 inches
- Mounting: 4 x 6 mm threaded holes at 90°
- Standard compliance
- CE marking: Yes
- Size
- Weight: 3.3 kg / 7.28 lbs
- 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
