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.

Applications:

With a wide frequency response range (500 Hz - 20.000 Hz) and 280 Watt power handling, the ND940 is the ideal driver for heavy duty professional applications.

Main 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