The ND840 is a high performance 3-inch diaphragm compression driver with a 1.4 inch exit throat featuring the smallest size of the art technology. The diaphragm are precision completely formed from pure titanium. Voice coil assembly is designed using high temperature kapton former and it is joined to the diaphragm by RCF proprietary Direct Drive kapton technology. Diaphragm suspension is designed by extensive FEM study for low distortion and low frequency range extension.

Features

• 3-inch Diaphragm, 1.4-inch Exit Throat / Pure Titanium Compression Driver
• 220W continuous program power handling
• Frequency range: 500Hz - 20kHz
• 3-slot optimized geometry phase plug
• Titanium diaphragm
• Copper inductance ring for extended response
• Vented, damped, low distortion suspension system
• Nedymium magnet assembly

Specification

• Exit Throat Diameter: 1.4 inch / 36 mm
• Related Impedance: 8 ohm
• Program Power (watt): 220 W
• Power handling capacity: 110 W
• Sensitivity: 109 dB
• Frequency range: 500 - 20000 Hz
• Suspension Design: Double Roll
• Minimum Impedance (ohm): 7.00 ohm
• Voice Coil Diameter: 3.0 inch / 76 mm
• Voice Coil Former Design: Direct Drive Kapton
• Number of layers: 1
• Kind of layers: inside/outside
• Flux Density: 2.0 T
• Phase Plug Design: 3 slot

Thiele - small parameters

• Bl factor (Bl) (T x m): 12.30 T x m

Mounting information:

• Overall diameter: 115 mm / 4.53 inches
• Overall height: 46 mm / 1.81 inches
• Mounting:  4 x 6 mm threaded holes at 90°

Size

• Weight: 1.4 kg / 3.09 lbs

Shipping information

• Package Height: 63 mm / 2.48 inches
• Package Width: 142 mm / 5.59 inches
• Package Depth: 144 mm / 5.67 inches
• Package Weight: 1.7 kg / 3.75 lbs