B&C 4NDF34 4″ Professional Woofer LF Driver
The B&C 4NDF34 is a compact, high-performance 4-inch professional woofer designed for applications where maximum output, low weight, and exceptional reliability are required from an ultra-compact transducer. Developed using advanced neodymium motor technology and professional-grade materials, the B&C 4NDF34 delivers remarkable performance for its size, making it an ideal choice for compact line arrays, portable PA systems, column loudspeakers, stage monitoring systems, and installed sound reinforcement applications.
Despite its compact 4-inch format, the B&C 4NDF34 is engineered to handle significant power levels while maintaining excellent efficiency and low distortion. The combination of a powerful neodymium inside slug magnet assembly, large 34 mm copper voice coil, and lightweight moving system enables the driver to produce impressive acoustic output while preserving accuracy and transient response throughout its operating bandwidth.
With a frequency response extending from 110 Hz to 8000 Hz, the B&C 4NDF34 offers exceptional versatility for compact two-way systems and multi-driver line array designs. Its extended bandwidth allows system designers to achieve smooth integration with high-frequency compression drivers while maintaining strong vocal intelligibility and detailed musical reproduction.
The driver’s compact dimensions, low weight, and robust construction make it particularly attractive for modern loudspeaker designs where performance, portability, and installation flexibility are critical. Whether used in portable sound reinforcement systems or fixed installations, the B&C 4NDF34 delivers the reliability and acoustic performance expected from a premium B&C professional transducer.
Key Features
- 100 W nominal power handling
- 200 W continuous power handling
- 34 mm (1.3 inch) copper voice coil
- 92 dB sensitivity
- 110 Hz – 8000 Hz frequency response
- Lightweight neodymium inside slug magnet assembly
- Glass fibre voice coil former
- Extended bandwidth performance
- Double roll surround suspension
- TWP waterproof cone treatment on both sides
- Compact lightweight design
- Optimized for professional sound reinforcement systems
Advanced Neodymium Motor Assembly
At the heart of the B&C 4NDF34 is a high-efficiency neodymium inside slug magnet structure designed to maximize performance while minimizing overall weight. Neodymium technology offers significantly greater magnetic strength than conventional ferrite systems, allowing the driver to deliver professional-grade output from an exceptionally compact package.
The motor assembly generates a substantial 1.25 Tesla flux density, providing strong control over the moving assembly and helping maintain low distortion throughout the driver’s operating range. This powerful magnetic structure contributes to accurate cone movement and exceptional transient response.
The driver also features a Bl factor of 9 Tm, providing effective motor force and excellent control of the lightweight cone assembly. This contributes to improved efficiency and ensures the driver remains responsive even at higher output levels.
The neodymium motor design significantly reduces overall driver weight, making the B&C 4NDF34 particularly suitable for portable systems, compact line arrays, and installation projects where weight reduction is a priority.
High-Performance Voice Coil Design
The B&C 4NDF34 utilizes a 34 mm copper voice coil wound on a durable glass fibre former. This combination provides an excellent balance of thermal capacity, reliability, and acoustic performance.
Copper winding material delivers efficient electrical conductivity and contributes to the driver’s strong motor performance. The glass fibre former offers excellent resistance to heat and mechanical stress, ensuring reliable operation under demanding professional conditions.
The voice coil assembly features an 11 mm winding depth operating within a 7 mm magnetic gap, providing excellent control of cone movement while supporting the excursion capability required for compact low-frequency reproduction.
With 100 W nominal power handling and 200 W continuous power handling, the B&C 4NDF34 offers exceptional power capability for a driver of this size, making it suitable for demanding professional loudspeaker applications.
Cone and Suspension System
The B&C 4NDF34 features an exponential cone profile designed to provide smooth frequency response characteristics and efficient acoustic performance. This cone geometry contributes to excellent vocal clarity and detailed low-midrange reproduction while maintaining controlled behaviour throughout the driver’s operating range.
The suspension system incorporates a double roll surround, allowing controlled cone movement while maintaining excellent mechanical stability. This design helps support accurate transient response and reliable long-term operation.
A single spider suspension system maintains proper voice coil alignment and contributes to the driver’s consistent mechanical behaviour under high-output conditions. Together, the surround and spider assembly ensure stable operation and low distortion performance.
To improve durability in demanding environments, the cone incorporates TWP Waterproof Both Sides treatment. Unlike conventional waterproof coatings applied only to the front of the cone, the TWP treatment protects both sides of the cone assembly, enhancing resistance to moisture and environmental conditions while maintaining long-term performance consistency.
Extended Bandwidth Performance
One of the most impressive characteristics of the B&C 4NDF34 is its ability to reproduce a wide frequency range from 110 Hz to 8000 Hz. This broad operating bandwidth provides system designers with significant flexibility when developing compact loudspeaker systems.
The driver’s low moving mass of just 6.1 grams contributes to excellent transient response and allows it to reproduce vocal content and musical detail with remarkable accuracy. This makes the B&C 4NDF34 particularly effective in compact line arrays and column loudspeakers where clarity and intelligibility are critical.
Its low 0.23 mH inductance further enhances high-frequency performance, contributing to cleaner upper-midrange reproduction and smoother crossover integration with compression drivers.
The combination of low moving mass, strong motor control, and extended bandwidth enables the B&C 4NDF34 to deliver impressive performance across a wide variety of professional applications.
Compact Professional System Integration
The compact dimensions and lightweight construction of the B&C 4NDF34 make it highly versatile for modern loudspeaker designs.
Typical applications include:
- Compact line array systems
- Column loudspeaker systems
- Portable PA systems
- Stage monitoring systems
- Installed sound reinforcement systems
- Distributed audio systems
- Compact two-way loudspeakers
- Multi-driver professional loudspeaker arrays
Its combination of high power handling, compact size, and lightweight construction provides system designers with exceptional flexibility when developing portable and installed audio solutions.
Technical Specifications
Nominal Diameter: 100 mm (4 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 6.4 Ω
Nominal Power Handling: 100 W
Continuous Power Handling: 200 W
Sensitivity: 92 dB
Frequency Range: 110 Hz – 8000 Hz
Voice Coil Diameter: 34 mm (1.3 in)
Winding Material: Copper
Former Material: Glass Fibre
Winding Depth: 11 mm (0.43 in)
Magnetic Gap Depth: 7 mm (0.28 in)
Flux Density: 1.25 T
Woofer Cone Treatment: TWP Waterproof Both Sides
Thiele-Small Parameters
Fs: 110 Hz
Re: 5.5 Ω
Qes: 0.28
Qms: 4.2
Qts: 0.27
Vas: 1.6 dm³ (0.06 ft³)
Sd: 57 cm² (8.84 in²)
η₀: 0.7 %
Xmax: 3.8 mm
Xvar: 5.7 mm
Mms: 6.1 g
Bl: 9 Tm
Le: 0.23 mH
EBP: 393 Hz
Design Features
Surround Shape: Double Roll
Cone Shape: Exponential
Magnet Material: Neodymium Inside Slug
Spider: Single
Pole Design: T-Pole
Woofer Cone Treatment: TWP Waterproof Both Sides
Mounting Information
Overall Diameter: 127 mm (5 in)
Bolt Circle Diameter: 115 mm (4.53 in)
Baffle Cutout Diameter: 103 mm (4.06 in)
Depth: 66 mm (2.6 in)
Flange and Gasket Thickness: 3 mm (0.12 in)
Air Volume Occupied by Driver: 0.25 dm³ (0.01 ft³)
Net Weight: 0.55 kg (1.21 lb)
Shipping Units: 1 Piece
Shipping Weight: 0.67 kg (1.48 lb)
Shipping Box: 117 × 120 × 110 mm
Recone Kit: RCK04NDF34
Applications
The B&C 4NDF34 is engineered for professional audio applications where compact dimensions, lightweight construction, and dependable performance are essential. Its powerful neodymium motor assembly, extended bandwidth capability, and robust waterproof cone treatment make it particularly suitable for compact line arrays, column loudspeakers, portable PA systems, stage monitoring systems, and installed sound reinforcement projects.
With impressive power handling, excellent efficiency, and professional-grade reliability, the B&C 4NDF34 provides loudspeaker designers with a highly capable compact woofer solution. For applications requiring maximum performance from minimal space and weight, the B&C 4NDF34 delivers the engineering excellence and acoustic performance expected from a premium B&C transducer.
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About B&C Speakers S.r.L.
B&C Speakers products are built in Bagno a Ripoli (Florence), Italy., ensuring high quality products to suite your speaker building requirements. Their 10,500 square meter facility incorporates highly sophisticated automation and quality control. Over the years they become one of the world leaders in the Professional Audio market, a brand recognized everywhere as a premium product that offers excellent value to the consumer.
