RCF ND840 Neodymium Compression Driver

The RCF ND840 is a high-performance 3-inch diaphragm compression driver with a 1.4-inch exit throat, designed for compact yet powerful professional sound systems. It features a pure titanium diaphragm, 3-slot phase plug, and copper inductance ring for an extended frequency response with minimal distortion. The Direct Drive Kapton voice coil assembly ensures high power handling and thermal stability, while the vented, damped suspension system improves clarity and low-frequency extension. With 220W continuous program power handling and 109 dB sensitivity, the ND840 is an excellent choice for high-powered two-way and multi-way speaker systems.

Product Specifications:

Exit Throat Diameter: 1.4 inch (36 mm)

Impedance: 8Ω

Program Power: 220W

Power Handling: 110W

Sensitivity: 109 dB

Frequency Range: 500 Hz – 20 kHz

Diaphragm Material: Pure Titanium

Suspension Material: Pure Titanium

Suspension Design: Double Roll

Minimum Impedance: 7.00Ω

Voice Coil Diameter: 3.0 inch (76 mm)

Voice Coil Winding Material: Edgewound Aluminum

Voice Coil Former: Direct Drive Kapton

Layers: Inside/Outside, single layer

Flux Density: 2.0 T

Phase Plug: 3-slot aluminum

Magnet Type: Neodymium

Demodulation Ring: Copper

Overall Diameter: 115 mm (4.53 inches)

Overall, Height: 46 mm (1.81 inches)

Mounting: 4 × 6 mm threaded holes at 90°

Shipping Information

Package Dimensions: 142 × 144 × 63 mm (5.59 × 5.67 × 2.48 inches)

Weight: 1.4 kg (3.09 lbs)

Shipping Weight: 1.7 kg (3.75 lbs)