B&C 8NW51 8″ Professional Woofer LF Driver
The B&C 8NW51 is a professional 8-inch woofer LF driver engineered for compact high-efficiency loudspeaker systems requiring lightweight construction, high motor strength, and controlled low-frequency performance. Designed around a high-energy neodymium ring magnet assembly and optimized moving system, the B&C 8NW51 delivers strong output capability while maintaining reduced weight for portable and installed professional audio applications.
Developed for compact two-way loudspeaker systems, stage monitors, portable PA systems, and professional sound reinforcement applications, the B&C 8NW51 combines advanced cooling technologies with optimized motor control to maintain stable performance during demanding operation. Its lightweight construction and high BL motor design make it particularly suitable for modern loudspeaker systems where output density and reduced system weight are important design priorities.
Key Features
- 200 W nominal power handling
- 400 W continuous program power capacity
- 51 mm (2 inch) copper voice coil
- 96.5 dB sensitivity
- 70 Hz – 3000 Hz frequency response
- Neodymium ring magnet assembly
- Shorting copper cap for extended HF response
- Ventilated voice coil gap for reduced power compression
- TWP waterproof cone treatment on both sides
- High BL motor design for compact professional systems
Neodymium Motor Structure and Magnetic Performance
The B&C 8NW51 utilizes a lightweight neodymium ring magnet motor assembly, designed to deliver high magnetic force while reducing overall driver mass. This approach makes the driver particularly suitable for portable sound reinforcement systems where weight reduction remains a major advantage. The motor structure maintains strong cone control while supporting high efficiency from compact system designs.
The driver incorporates a shorting copper cap, helping reduce inductance variation and extending upper frequency behavior. Lower inductance modulation improves crossover integration and contributes to smoother response performance within compact two-way systems.
With a measured 1.3 T flux density and a strong 18.9 Tm BL factor, the motor assembly delivers excellent control over cone movement while supporting high transient performance and efficient acoustic output. These characteristics contribute significantly to the driver’s efficiency and output capability.
Voice Coil Construction and Thermal Management
At the center of the B&C 8NW51 is a 51 mm copper voice coil wound on a glass fibre former. This construction provides thermal stability while maintaining mechanical strength during sustained high-output operation. Copper windings improve thermal handling characteristics while contributing to stable long-term performance.
The driver supports 200 W nominal power handling and 400 W continuous program power handling, making it suitable for professional applications where reliable continuous operation is required. A ventilated voice coil gap improves airflow through the motor assembly, helping reduce thermal buildup and minimizing power compression during demanding operation.
The relatively lightweight moving assembly contributes to faster transient response while supporting controlled low-frequency reproduction from compact cabinet designs.
Cone Geometry and Suspension Design
The B&C 8NW51 utilizes an exponential cone profile combined with a double-roll surround geometry. This design provides controlled cone movement while maintaining the excursion capability required for professional low-frequency applications. The suspension geometry has been optimized for efficient output and stable operation throughout the intended bandwidth.
A single spider suspension system maintains mechanical stability while supporting predictable cone behavior under higher output conditions. The cone assembly incorporates TWP waterproof treatment on both sides, improving resistance against humidity and environmental exposure in portable and installed applications.
Compact System Integration
The B&C 8NW51 is optimized for compact enclosure designs where high efficiency and lightweight construction are priorities.
Its combination of high motor strength, low moving mass, and compact dimensions allows system designers to create smaller loudspeaker systems without sacrificing output capability. The driver’s high EBP characteristics make it suitable for compact vented designs and applications requiring strong mid-bass performance from limited enclosure volume.
Typical applications include:
- Compact two-way loudspeaker systems
- Portable PA systems
- Professional stage monitors
- Compact bass reflex cabinets
- Installed sound systems
- Lightweight touring loudspeakers
Technical Specifications
Nominal Diameter: 200 mm (8 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 7.7 Ω
Nominal Power Handling: 200 W
Continuous Program Power: 400 W
Sensitivity: 96.5 dB
Frequency Range: 70 Hz – 3000 Hz
Voice Coil Diameter: 51 mm (2 in)
Winding Material: Copper
Former Material: Glass Fibre
Winding Depth: 19 mm
Magnetic Gap Depth: 10 mm
Flux Density: 1.3 T
Magnet Material: Neodymium Ring
Cone Shape: Exponential
Surround Shape: Double Roll
Spider Design: Single
Pole Design: T-Pole
Cone Treatment: TWP Waterproof Both Sides
Thiele-Small Parameters
Fs: 74 Hz
Re: 5.2 Ω
Qes: 0.19
Qms: 2.7
Qts: 0.17
Vas: 11 dm³
Sd: 220 cm²
η₀: 2.4 %
Xmax: 6 mm
Xvar: 6 mm
Mms: 28 g
BL Factor: 18.9 Tm
Le: 0.4 mH
EBP: 389 Hz
Mounting Information
Overall Diameter: 225 mm
Bolt Circle Diameter: 210 mm
Baffle Cutout Diameter: 187 mm
Depth: 100 mm
Flange and Gasket Thickness: 11 mm
Air Volume Occupied by Driver: 1.1 dm³
Net Weight: 3.05 kg
Shipping Weight: 3.5 kg
Shipping Box: 255 × 255 × 150 mm
Recone Kit: RCK008NW518
Applications
The B&C 8NW51 is engineered for professional low-frequency applications requiring lightweight construction, high efficiency, and strong motor control. Its neodymium motor structure, advanced cooling design, and waterproof cone treatment make it particularly suitable for compact PA systems, stage monitoring applications, portable loudspeakers, and professional installed audio systems.
For system designers requiring a lightweight professional woofer optimized for compact enclosure designs and efficient output performance, the B&C 8NW51 delivers an effective balance of portability, power handling, and professional-grade acoustic performance.
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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.
