RCF ND940 - 280W 4-inch Titanium Compression Driver with 1.4-inch Exit Throat and 8-Ohm Impedance in Black Finish

The RCF ND940 is a high-performance, ultra-compact 4-inch diaphragm compression driver designed for professional audio applications. Featuring a 1.4-inch exit throat, this driver offers exceptional power handling, clarity, and low distortion across a wide frequency range. Its design focuses on maximizing acoustic performance while minimizing distortion, making it ideal for use in high-output systems, including line arrays and point-source applications.

At the core of the ND940 is a neodymium magnet assembly that ensures high efficiency and precise control over the driver's moving parts. A thin copper ring, precision-pressed onto the pole piece, reduces the inductance characteristics of the magnetic circuit and voice coil, leading to an extended and controlled acoustic frequency response. The voice coil assembly features a high-strength, high-temperature Kapton voice coil former, paired with edge-wound copper-clad aluminum wire, ensuring reliable performance even under high power conditions. RCF's proprietary Direct Drive Kapton technology directly connects the voice coil to the diaphragm, ensuring optimal power transfer and reduced distortion.

The ND940 also features a 4-slot optimized geometry phase plug, which, combined with extensive computer-assisted modeling, helps minimize air distortion, maximize output, and achieve a balanced acoustic performance. This advanced phase plug design ensures the driver delivers clear and precise sound with minimal distortion across its operating bandwidth. The diaphragm is made of pure titanium, while the suspension material is polyimide, providing durability and efficiency. The flat suspension design allows for smooth, linear motion of the diaphragm, enhancing the overall performance of the driver.

With a sensitivity of 110 dB and a frequency range extending from 500 Hz to 20 kHz, the ND940 is capable of delivering powerful and accurate high-frequency sound reproduction. It handles 280W of continuous program power and offers a minimum impedance of 8.5 ohms, making it a versatile choice for integration in high-end sound reinforcement systems.

Features

• 4-inch diaphragm with a 1.4-inch exit throat for high power handling and efficiency
• 280W continuous program power handling with a frequency range of 500 Hz - 20 kHz
• 4-slot optimized phase plug design to minimize air distortion and maximize output
• Pure titanium diaphragm with a polyimide flat suspension for enhanced durability and performance
• Copper inductance ring for extended frequency response and reduced distortion
• Neodymium magnet assembly for high efficiency and dynamic response
• Direct Drive Kapton technology for improved power transfer and low distortion
• 110 dB sensitivity for clear and efficient high-frequency sound reproduction
• Compact and lightweight design, weighing just 6 lbs, ideal for space-constrained installations
• CE compliant, ensuring reliable performance and safety standards

Specifications

General Specifications

• Exit Throat Diameter: 1.4 inch / 36 mm
• Related Impedance: 8 ohm
• Program Power (watt): 280 W
• Power handling capacity: 140 W
• Sensitivity: 110 dB
• Frequency range: 500 - 20000 Hz
• Diaphragm Material: Pure Titanium
• Suspension Material: Polyimide
• Suspension Design: Flat
• Minimum Impedance (ohm): 8.50 ohm
• Voice Coil Diameter: 4.0 inch / 102 mm
• Voice Coil Winding Material: Edgewound Aluminum
• Voice Coil Former Design: Direct Drive Kapton
• Number of layers: 1
• Kind of layers: outside
• Flux Density: 2.0 T
• Phase Plug Design: 4 slot
• Phase Plug Material: Aluminum
• Magnetics: Neodymium
• Voice Coil Demodulation Ring: Copper

Thiele (small parameters)

• Bl factor (Bl) (T x m): 17.60 T x m

Mounting Information

• Overall diameter: 140 mm / 5.51 inches
• Overall height: 60 mm / 2.36 inches
• Mounting: 4 x 6 mm threaded holes at 90°

Standard Compliance

• Safety agency: CE compliant

Size/Weight

• Weight: 6 lbs

Shipping Information

• Package Height: 3.11 inches
• Package Width: 6.65 inches
• Package Depth: 6.73 inches
• Package Weight: 6.33 lbs