B&C 8PS21 8″ Professional Mid-Bass LF Driver
The B&C 8PS21 is a professional 8-inch low-frequency driver developed for compact bass and mid-bass applications where efficiency, controlled response, and reliable power handling are critical. Engineered around a ferrite motor structure and optimized moving assembly, the B&C 8PS21 delivers balanced performance across low-frequency and lower midrange applications while maintaining compact enclosure compatibility.
Designed for professional sound reinforcement systems, stage monitors, portable loudspeakers, and compact multi-way cabinets, the B&C 8PS21 combines strong sensitivity with carefully optimized suspension geometry to maintain consistent performance across demanding operating conditions. Its broad usable response and compact form factor make it suitable for installations where cabinet size and efficiency matter equally.
Key Features
- 200 W nominal power handling
- 400 W continuous program power capacity
- 51 mm (2 inch) copper voice coil
- Ferrite motor structure
- 94 dB sensitivity
- 70 Hz – 3000 Hz frequency response
- Shorting copper cap for extended HF response
- Double-roll surround geometry
- Exponential cone profile
- Optimized for compact mid-bass applications
Ferrite Motor Design and Magnetic Structure
The B&C 8PS21 utilizes a ferrite magnet motor structure engineered for reliability and stable long-term performance. Ferrite motors remain widely used in professional loudspeaker applications because of their consistent magnetic performance and durability under continuous operation.
The motor assembly incorporates a shorting copper cap, which helps extend high-frequency response while reducing inductance effects. Lower inductance variation contributes to smoother upper-frequency behavior and improved integration into multi-way loudspeaker systems.
With a measured magnetic flux density of 1.1 T, the motor maintains stable cone control while supporting efficient acoustic output. Combined with the optimized suspension geometry, this motor design contributes to controlled transient response and predictable system integration.
Voice Coil Construction and Thermal Management
At the center of the B&C 8PS21 is a 51 mm copper voice coil wound on a Kapton former. This combination provides strong thermal stability while maintaining the low moving mass required for responsive mid-bass reproduction.
The driver supports 200 W nominal power handling and 400 W continuous program power, making it suitable for demanding professional applications where sustained output capability is required. The coil geometry has been optimized to maintain thermal efficiency during extended operation.
Its relatively lightweight moving system contributes to fast transient behavior, helping improve punch, articulation, and mid-bass definition.
Cone Geometry and Suspension Design
The B&C 8PS21 utilizes an exponential cone profile paired with a double-roll surround configuration. This geometry provides controlled cone movement while maintaining mechanical stability during higher excursion conditions.
A single spider suspension system provides mechanical control while keeping moving mass relatively low. This contributes to responsive transient performance and predictable operation across the driver’s usable frequency range.
The cone assembly does not utilize cone treatment, allowing the driver to maintain lower moving mass characteristics while preserving efficiency and responsiveness.
Compact System Integration and Performance
One of the major strengths of the B&C 8PS21 is its ability to deliver usable low-frequency performance from compact cabinet designs.
The manufacturer recommends a 14 dm³ enclosure volume with a 73 Hz tuning frequency, making the driver suitable for smaller vented designs where cabinet efficiency and size optimization are priorities.
Typical applications include:
- Portable PA systems
- Compact bass reflex cabinets
- Stage monitor systems
- Multi-way loudspeaker systems
- Installed audio systems
- Mid-bass reinforcement applications
Its compact loading characteristics provide flexibility for designers building space-efficient professional systems.
Technical Specifications
Nominal Diameter: 200 mm (8 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 7 Ω
Nominal Power Handling: 200 W
Continuous Program Power: 400 W
Sensitivity: 94 dB
Frequency Range: 70 Hz – 3000 Hz
Voice Coil Diameter: 51 mm (2 in)
Winding Material: Copper
Former Material: Kapton
Winding Depth: 16 mm
Magnetic Gap Depth: 8 mm
Flux Density: 1.1 T
Magnet Material: Ferrite
Cone Shape: Exponential
Surround Shape: Double Roll
Spider Design: Single
Pole Design: T-Pole
Cone Treatment: None
Thiele-Small Parameters
Fs: 73 Hz
Re: 5.4 Ω
Qes: 0.36
Qms: 4.2
Qts: 0.33
Vas: 14 dm³
Sd: 220 cm²
η₀: 1.5 %
Xmax: ±5 mm
Xvar: ±4 mm
Mms: 23 g
BL Factor: 12.6 Tm
Le: 0.5 mH
EBP: 203 Hz
Mounting Information
Overall Diameter: 225 mm
Bolt Circle Diameter: 210 mm
Baffle Cutout Diameter: 187 mm
Depth: 91 mm
Flange and Gasket Thickness: 11 mm
Air Volume Occupied by Driver: 1.2 dm³
Net Weight: 3.3 kg
Shipping Weight: 3.75 kg
Shipping Box: 255 × 255 × 150 mm
Recone Kit: RCK008PS218
Applications
The B&C 8PS21 is designed for professional applications requiring compact dimensions, efficient performance, and controlled mid-bass reproduction. Its combination of moderate enclosure requirements, broad frequency coverage, and efficient motor design makes it suitable for portable PA systems, compact speaker systems, stage monitoring, and multi-way sound reinforcement applications.
For designers looking for a compact professional driver that balances efficiency, output capability, and installation flexibility, the B&C 8PS21 provides a proven solution for modern loudspeaker designs.
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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.
