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
