RCF ND640 Compression Driver - 2.5 Inch

The RCF ND640 is a high-performance 2.5-inch diaphragm compression driver with a 1.4-inch exit throat, designed for precision and efficiency in high-frequency sound reproduction. Its pure titanium diaphragm, combined with a 3-slot phase plug and neodymium magnet assembly, ensures exceptional clarity and output. The proprietary Direct Drive Kapton voice coil assembly enhances power handling and thermal stability, while the FEM-optimized double-roll titanium suspension extends the low-frequency range with minimal distortion. With 180W continuous program power handling and 110 dB sensitivity, the ND640 is ideal for professional audio applications requiring superior performance in a compact design.

Product Specifications:

Exit Throat Diameter: 1.4 inch / 36 mm

Impedance: 8 ohms

Program Power: 180 W

Power Handling Capacity: 90 W

Sensitivity: 110 dB

Frequency Range: 700 - 20,000 Hz

Diaphragm Material: Pure Titanium

Suspension Material: Pure Titanium

Suspension Design: Double Roll

Minimum Impedance: 7.50 ohm

Voice Coil Diameter: 2.5 inch / 63 mm

Voice Coil Winding Material: Edgewound Aluminum

Voice Coil Former: Direct Drive Kapton

Number of Layers: 1 (outside wound)

Flux Density: 1.9 T

Phase Plug Design: 3-slot, Aluminum

Magnet Type: Neodymium

Demodulation Ring: Copper

Mounting Information

Overall Diameter: 102 mm / 4.02 inches

Overall Height: 40 mm / 1.57 inches

Mounting: 4 x 6 mm threaded holes at 90°

Compliance & Safety

Standard Compliance: CE Compliant

Size & Weight

Weight: 1.06 kg / 2.34 lbs

Shipping Information

Package Height: 74 mm / 2.91 inches

Package Width: 122 mm / 4.8 inches

Package Depth: 123 mm / 4.84 inches

Package Weight: 1.17 kg / 2.58 lbs