B&C 6CLA51 6.5″ Professional Woofer LF Driver
The B&C 6CLA51 is a high-performance 6.5-inch professional woofer designed for compact sound reinforcement systems requiring excellent power handling, lightweight construction, and reliable acoustic performance. As part of B&C’s popular CL Series, the B&C 6CLA51 has been engineered to provide a cost-effective solution for line array systems and point-source loudspeaker applications without compromising the professional performance standards expected from B&C transducers. The combination of a neodymium motor assembly, aluminium voice coil technology, and compact dimensions makes this driver an excellent choice for modern loudspeaker designs.
Developed specifically for compact vented enclosures, the B&C 6CLA51 delivers strong mid-bass performance, excellent vocal projection, and reliable long-term operation. Its lightweight design helps reduce overall cabinet weight while maintaining the power handling and sensitivity required for demanding professional audio environments. Whether used in portable PA systems, compact line arrays, stage monitoring applications, or installed sound systems, the B&C 6CLA51 provides an outstanding balance of efficiency, reliability, and value.
Key Features
- 250 W nominal power handling
- 500 W continuous program power capacity
- 51 mm (2 inch) aluminium voice coil
- 94.5 dB sensitivity
- 100 Hz – 4000 Hz frequency response
- Lightweight neodymium inside slug magnet assembly
- Polyimide voice coil former
- Triple roll surround geometry
- WP waterproof front cone treatment
- Optimized for line array and point-source applications
- Compact vented enclosure compatibility
- Excellent power-to-weight ratio
Lightweight Neodymium Motor Technology
The B&C 6CLA51 utilizes a neodymium inside slug magnet structure, allowing the driver to achieve significant weight reduction compared to traditional ferrite-based designs. This lightweight motor architecture makes the driver particularly attractive for portable sound reinforcement systems, line arrays, and installations where reducing overall enclosure weight is a priority.
The motor assembly generates a 1.05 T flux density, providing effective control of the moving assembly while maintaining excellent efficiency. Combined with an impressive 11.4 Tm BL factor, the magnetic system delivers stable cone control and predictable performance throughout the operating range. These characteristics contribute to improved transient response and reduced distortion under demanding operating conditions.
The neodymium motor design also allows the driver to maintain compact physical dimensions, making it easier to integrate into space-conscious loudspeaker systems where every kilogram and every cubic centimetre matter.
Voice Coil Construction and Thermal Performance
At the heart of the B&C 6CLA51 is a 51 mm aluminium voice coil wound on a polyimide former. The use of aluminium winding material helps reduce moving mass while maintaining the thermal performance required for professional audio applications. Lower moving mass contributes to improved transient response and greater efficiency across the operating bandwidth.
The driver is rated for 250 W nominal power handling and 500 W continuous program power, making it suitable for demanding sound reinforcement environments where reliability and consistency are critical. The voice coil assembly has been engineered to maintain stable performance during extended operation while minimizing thermal compression.
With a 13.5 mm winding depth and 8 mm magnetic gap depth, the motor structure provides controlled excursion capability while maintaining strong magnetic coupling throughout the voice coil’s operating range.
Cone and Suspension Design
The B&C 6CLA51 features a radial cone profile combined with a triple roll surround, providing controlled cone movement and stable operation across the intended frequency range. This suspension geometry helps maintain linear performance while supporting the excursion requirements of compact professional loudspeaker systems.
A single spider suspension system ensures accurate voice coil alignment and mechanical stability under high-output conditions. The suspension has been optimized to provide predictable behaviour while preserving efficiency and transient accuracy.
The cone incorporates WP waterproof front-side treatment, improving resistance to moisture and environmental exposure. This protective treatment enhances long-term durability, particularly in portable and installed applications where environmental conditions may vary.
System Integration and Enclosure Design
The B&C 6CLA51 has been optimized for use in compact vented loudspeaker systems. B&C recommends an 11 dm³ enclosure volume with a 95 Hz tuning frequency, allowing designers to achieve excellent performance while maintaining compact cabinet dimensions. This makes the driver especially suitable for modern line array modules and compact point-source loudspeakers.
Typical applications include:
- Compact line array systems
- Point-source loudspeakers
- Portable PA systems
- Stage monitoring systems
- Installed sound reinforcement systems
- Compact vented enclosure designs
- Multi-way professional loudspeaker systems
Technical Specifications
Nominal Diameter: 170 mm (6.5 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 6.1 Ω
Nominal Power Handling: 250 W
Continuous Program Power: 500 W
Sensitivity: 94.5 dB
Frequency Range: 100 Hz – 4000 Hz
Voice Coil Diameter: 51 mm (2 in)
Winding Material: Aluminium
Former Material: Polyimide
Winding Depth: 13.5 mm
Magnetic Gap Depth: 8 mm
Flux Density: 1.05 T
Magnet Material: Neodymium Inside Slug
Cone Shape: Radial
Surround Shape: Triple Roll
Spider Design: Single
Pole Design: T-Pole
Cone Treatment: WP Waterproof Front Side
Recommended Enclosure: 11 dm³
Recommended Tuning: 95 Hz
Recommended Loading: Vented Box
Thiele-Small Parameters
Fs: 96 Hz
Re: 5 Ω
Qes: 0.36
Qms: 2.9
Qts: 0.32
Vas: 4.3 dm³
Sd: 132 cm²
η₀: 1.1 %
Xmax: 4.8 mm
Xvar: 4 mm
Mms: 15 g
BL Factor: 11.4 Tm
Le: 0.9 mH
EBP: 267 Hz
Mounting Information
Overall Diameter: 180 mm
Bolt Circle Diameter: 165 mm
Baffle Cutout Diameter: 146 mm
Depth: 80 mm
Flange and Gasket Thickness: 7 mm
Net Weight: 1.2 kg
Shipping Weight: 1.45 kg
Shipping Box: 210 × 210 × 125 mm
Recone Kit: RCK06CLA518
Applications
The B&C 6CLA51 is engineered for professional audio applications where compact dimensions, low weight, and dependable output performance are essential. Its neodymium motor assembly, high-power aluminium voice coil, and optimized vented-box alignment make it particularly suitable for compact line arrays, point-source loudspeakers, stage monitors, portable PA systems, and installed sound reinforcement applications.
For system designers seeking a lightweight professional woofer capable of delivering reliable output and efficient performance from compact enclosures, the B&C 6CLA51 offers an outstanding combination of power handling, portability, and professional-grade reliability.
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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.
