B&C 4NDS34 4″ Professional Woofer LF Driver
The B&C 4NDS34 is a premium 4-inch professional woofer engineered to deliver impressive low-frequency performance, high power handling, and exceptional reliability from an ultra-compact format. Developed for modern professional loudspeaker systems where size, weight, and performance are equally important, the B&C 4NDS34 combines advanced neodymium motor technology with a robust moving assembly to provide outstanding acoustic performance in demanding applications.
Designed specifically for compact bass reflex systems, portable sound reinforcement speakers, column array systems, stage monitors, and installed audio applications, the B&C 4NDS34 offers an excellent balance of efficiency, bass extension, and long-term durability. Its optimized low-frequency design allows the driver to produce remarkable output from compact enclosure volumes while maintaining excellent control and low distortion characteristics.
At the heart of the B&C 4NDS34 is a lightweight neodymium inside slug motor assembly coupled with a large 34 mm copper voice coil and precision-engineered suspension system. This combination enables the driver to handle significant power while preserving the transient accuracy and reliability expected from professional B&C transducers.
With a frequency response extending from 80 Hz to 2000 Hz, the B&C 4NDS34 is specifically optimized for low-frequency and low-midrange reproduction. Its ability to generate strong bass output from a compact enclosure makes it an excellent choice for applications where installation space is limited but professional performance remains essential.
The combination of compact dimensions, low weight, and high-performance engineering makes the B&C 4NDS34 an ideal solution for designers seeking a premium low-frequency transducer for modern loudspeaker systems.
Key Features
- 100 W nominal power handling
- 200 W continuous power handling
- 34 mm (1.3 inch) copper voice coil
- 89 dB sensitivity
- 80 Hz – 2000 Hz frequency response
- Lightweight neodymium inside slug magnet assembly
- Glass fibre voice coil former
- Optimized low-frequency performance
- Roll surround suspension
- Exponential cone geometry
- TWP waterproof cone treatment on both sides
- Designed for compact vented enclosure systems
Advanced Neodymium Motor Technology
The B&C 4NDS34 features a powerful neodymium inside slug motor assembly engineered to maximize magnetic performance while minimizing overall driver weight. Neodymium technology allows the driver to achieve high motor strength without the bulk associated with traditional ferrite designs, making it particularly attractive for portable loudspeaker systems and weight-sensitive installations.
The motor assembly generates an impressive 1.25 Tesla flux density, providing excellent control of the moving assembly throughout the driver’s operating range. This strong magnetic field contributes to accurate cone movement, low distortion, and reliable performance under demanding operating conditions.
The driver also features a Bl factor of 8.8 Tm, ensuring effective motor force and stable cone control. This allows the B&C 4NDS34 to maintain excellent low-frequency performance while preserving efficiency and transient response.
Combined with the lightweight moving assembly, the advanced motor design helps maximize output capability while maintaining the compact dimensions required for modern loudspeaker designs.
High-Power Voice Coil Design
A key component of the B&C 4NDS34 is its 34 mm copper voice coil, which provides exceptional thermal capacity and long-term reliability for a driver of this size. The large voice coil diameter allows the driver to manage significant power levels while maintaining consistent performance.
The voice coil is wound using high-quality copper wire on a durable glass fibre former. Copper provides excellent electrical conductivity and contributes to strong motor performance, while the glass fibre former offers outstanding resistance to heat and mechanical stress.
The voice coil assembly incorporates an 11 mm winding depth operating within a 7 mm magnetic gap, providing excellent excursion control and supporting the driver’s low-frequency capabilities.
With 100 W nominal power handling and 200 W continuous power handling, the B&C 4NDS34 delivers impressive performance and reliability in demanding professional audio environments.
Cone and Suspension System
The B&C 4NDS34 utilizes an exponential cone profile optimized specifically for bass and low-midrange reproduction. This cone geometry helps maintain smooth response characteristics while promoting efficient acoustic loading throughout the operating bandwidth.
The suspension system features a roll surround, providing controlled cone movement and supporting the excursion requirements necessary for compact bass reproduction. This design contributes to accurate low-frequency performance while maintaining excellent mechanical stability.
A single spider suspension system ensures proper voice coil alignment and helps preserve consistent performance during high-output operation. Together, the suspension components provide reliable long-term operation while minimizing distortion.
To improve durability and environmental resistance, the cone incorporates TWP Waterproof Both Sides treatment. Unlike standard front-coated cones, this treatment protects both sides of the cone assembly, enhancing resistance to moisture, humidity, and changing environmental conditions.
Optimized for Compact Bass Reflex Systems
The B&C 4NDS34 has been specifically developed for compact vented enclosure applications. B&C recommends a 3 dm³ enclosure volume tuned to 90 Hz, allowing system designers to create extremely compact loudspeaker systems while maintaining useful bass extension.
The driver’s low 79 Hz resonant frequency and Qts of 0.24 make it particularly suitable for bass reflex alignments. These characteristics help maximize low-frequency output and efficiency from small enclosure volumes.
Its EBP value of 316 Hz further supports vented cabinet applications, allowing designers to achieve excellent bass performance while preserving compact cabinet dimensions.
This makes the B&C 4NDS34 an ideal choice for compact portable loudspeakers, column arrays, distributed audio systems, and space-constrained installation projects.
Professional System Integration
The compact dimensions and lightweight construction of the B&C 4NDS34 allow it to integrate easily into a wide variety of professional loudspeaker systems.
Typical applications include:
- Compact bass reflex loudspeakers
- Portable PA systems
- Column array systems
- Distributed audio systems
- Stage monitoring systems
- Installed sound reinforcement systems
- Compact two-way loudspeakers
- Multi-driver portable speaker systems
Its combination of high power handling, lightweight construction, and compact enclosure compatibility provides exceptional flexibility for loudspeaker designers.
Technical Specifications
Nominal Diameter: 100 mm (4 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 6.2 Ω
Nominal Power Handling: 100 W
Continuous Power Handling: 200 W
Sensitivity: 89 dB
Frequency Range: 80 Hz – 2000 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: 79 Hz
Re: 5.5 Ω
Qes: 0.25
Qms: 8.5
Qts: 0.24
Vas: 2.6 dm³ (0.09 ft³)
Sd: 57 cm² (8.84 in²)
η₀: 0.5 %
Xmax: 3.8 mm
Xvar: 5 mm
Mms: 7.2 g
Bl: 8.8 Tm
Le: 0.21 mH
EBP: 316 Hz
Design Features
Surround Shape: Roll
Cone Shape: Exponential
Magnet Material: Neodymium Inside Slug
Spider: Single
Pole Design: T-Pole
Woofer Cone Treatment: TWP Waterproof Both Sides
Recommended Enclosure: 3 dm³ (0.11 ft³)
Recommended Tuning: 90 Hz
Mounting Information
Overall Diameter: 127 mm (5 in)
Bolt Circle Diameter: 114 mm (4.51 in)
Baffle Cutout Diameter: 103 mm (4.06 in)
Depth: 67 mm (2.64 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: RCK04NDS348
Applications
The B&C 4NDS34 is engineered for professional audio applications requiring maximum performance from minimal space. Its advanced neodymium motor structure, high-power voice coil design, and optimized bass reflex alignment make it particularly suitable for compact loudspeaker systems, column arrays, portable PA systems, stage monitors, and installed sound reinforcement projects.
With strong low-frequency capability, professional reliability, and lightweight construction, the B&C 4NDS34 provides loudspeaker designers with a premium compact woofer solution capable of delivering impressive results in demanding professional environments. For applications where bass performance, compact dimensions, and long-term reliability are critical, the B&C 4NDS34 stands out as an exceptional choice.
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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.
