B&C Speakers 21 SW 115

A 21-inch Speaker Tailored for Large Volume Infra-Subwoofer Enclosures

The B&C 21SW115 belongs to the family of very large diameter speakers intended for modern subwoofer enclosures, where both foundation, reach, and significant dynamic reserve are sought. The 21-inch (53 cm) format follows a simple logic: move a lot of air with authority while maintaining a clear and usable response in sound reinforcement.

With its neodymium magnet, this model targets configurations where performance and logistics go hand in hand: touring, fixed installations, mobile stacks, or sound systems requiring high SPL density per enclosure. Its recommended load of 250 liters tuned to 32Hz provides a clear direction: this speaker is made to go low, support the low end of the mix, and endure long usage.

For Whom and For What Uses?

This infra-subwoofer speaker is aimed at integrators, enclosure manufacturers, service providers, and technicians designing subs with high acoustic pressure, capable of reproducing the lowest fundamentals with a "physical" impact sensation. It is particularly suitable for electronic music, hip-hop, amplified live, large stages, as well as installations requiring consistent foundation at high levels (clubs, venues, event spaces).

Thanks to its sensitivity of 97dB 1W/1m and bandwidth extending up to 1KHz, the 21SW115 can also be integrated into various topologies (pure infra, wideband sub, or configurations where the transition to the low-mid is carefully managed). As always with a 21-inch, optimization involves the right volume, proper tuning, and filtering adapted to the system.

Design and Key Points: Control, Endurance, and Reliability

Large Excursion and Mechanical Durability

With an Xmax of 14.0 mm, the 21SW115 is designed to maintain control when levels rise and transients become demanding. The triple roll suspension contributes to excursion stability while helping maintain a consistent response at high displacement. The double siliconed spider enhances mechanical durability and contributes to longevity during intensive use.

Neodymium Motor and 115 mm Voice Coil: Efficiency and Resistance

The neodymium motor keeps weight down while aiming for strong motor force, a valuable feature when multiplying enclosures or needing to limit transported mass. The 115 mm voice coil (copper wire) is sized to handle high power and support long sessions, typical of subwoofer systems in professional use.

Treated Radial Cone: Sound Coherence and Protection

The radial cone with waterproof treatment front and back is an asset in real-world conditions: humidity variations, outdoor use, transport, and stage constraints. This treatment helps maintain a more stable response over time and better withstand harsh environments while preserving the coherence of the infra-bass.

Technical specifications