Overview3-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 Specifications
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 General specifications
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
Diaphragm Material : Pure Titanium
Suspension Material : Pure Titanium
Suspension Design : Double Roll
Minimum Impedance (ohm) : 7.00 ohm
Voice Coil Diameter : 3.0 inch / 76 mm
Voice Coil Winding Material : Edgewound Aluminum
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
Phase Plug Material : Aluminum
Magnetics : Neodymium
Voice Coil Demodulation Ring : Copper
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°
Standard compliance
Safety agency : CE compliant
Size / Weight
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
