B&C 21DS115 – 21″ High-Energy Subwoofer Driver

The B&C 21DS115 is a 21-inch subwoofer driver built for pro audio systems that demand exceptional bass output, high sensitivity, and reliable performance under heavy load. With a long, four-layer voice coil and an efficient motor structure, it’s engineered to deliver powerful, clean low frequencies in touring rigs, large-scale installs, or bass-intensive subsystems. This driver pushes heavy SPLs without sacrificing tonal fidelity or durability.

Deep Low-Frequency Extension & Usable Bandwidth

With a nominal diameter of 530 mm (21 inches), the 21DS115 moves massive air to deliver rich, impactful bass. Its frequency range of 30 Hz to 1000 Hz lets it handle sub-bass fundamentals with authority, while also retaining usable output through the lower midrange. Whether housed in large vented enclosures or bass modules, it gives you both weight and clarity in the bass region.

Exceptional Power Handling & Thermal Headroom

The 21DS115 is specified for nominal power handling of 1700 W and supports continuous program power of 3400 W, offering solid headroom for dynamic peaks and tough audio material. The 116 mm (4.5-inch) copper-clad aluminum voice coil, combined with long winding depth, ensures the coil remains stable when pushed hard. Its thermal design helps minimize power compression, keeping performance consistent even under prolonged usage.

High Sensitivity & Output Efficiency

With a sensitivity of 99 dB (1W/1m), the 21DS115 delivers strong acoustic output for every watt of input. This efficiency means you can reach loud, responsive bass with better headroom for amplifiers, which is especially valuable when multiple subs are used or when power resources are constrained.

Electrical Behavior & Integration

Operating at a nominal impedance of 8 Ω, with a minimum impedance of approximately 6.5 Ω, the 21DS115 offers predictable loading for amplifiers and crossover networks. Its electrical signature is stable, making integration into complex systems smoother and more reliable. It’s built to match well in both passive and active system designs without surprising dips or power stress.

Rugged Construction & Mechanical Durability

The driver features a robust motor assembly, reinforced suspension, and efficient thermal pathways. A long, four-layer voice coil, ventilated gap, and demodulating ring help reduce distortion, improve linearity, and prevent overheating. The cone is treated for moisture resistance, and the structural build holds up under heavy excursion and repeated use.

Ideal Applications

The 21DS115 is especially suited for:

• High-output subwoofer systems in clubs, festivals, or large venues
• Large bass modules in full-range PA stacks or touring subsystems
• Fixed installations requiring low-end authority and high SPL
• OEM designs where deep bass, efficiency, and durability are required

It excels in setups where the subwoofer must deliver serious performance without compromise.

Specifications

• Nominal Diameter: 530 mm (21 in)
• Voice Coil Diameter: 116 mm (4.5 in)
• Continuous Power Handling: 3400 W
• Nominal Power Handling: 1700 W
• Nominal Impedance: 8 Ω
• Minimum Impedance: ~6.5 Ω
• Frequency Range: 30 Hz – 1000 Hz
• Sensitivity: 99 dB (1W/1m)

Performance Summary

The 21DS115 is built for serious low-end impact. It offers high excursion capacity, efficient energy handling, and minimal distortion under load. Despite its size, it maintains clarity in the bass—attack, punch, and sustain are all present without blur. When pushed, it doesn’t degrade quickly: thermal design and mechanical strength allow for sustained performance in challenging conditions.

Conclusion

If you’re specifying a large subwoofer driver that delivers deep bass, strong sensitivity, and rugged reliability, 21DS115 is a top-tier choice. It combines power, efficiency, and durability in one driver, making it ideal for touring, installations, or applications where impact and clarity are essential. For pro audio systems needing real bass muscle with precision, the 21DS115 delivers.

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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.