The ND940 is an ultra-compact, high performance, high-power handling 4-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 aluminum wire directly joined to the diaphragm by RCF’s proprietary Direct Drive Kapton technology.
The ND940 features a 4-slot, optimized geometry, phase plug design. Extended computer assisted mathematical modeling and testing has resulted in a geometry that provides a balanced acoustic performance controlling and lowering air distortion and maximizing output.
Voice Coil: 4 inches
Magnetic Structure: Neodymium
Power Rating: 140 watts (AES)
Frequency Response: 500 Hz - 20 kHz
Sensitivity: 110 dB
Impedance: 8 ohms
Weight: 6.4 pounds