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Alcons Audio USA BQ211 quarter-wave loaded carbon 21-in subwoofer

The BQ211 is a double-tuned, quarter-wave loaded subwoofer system offering maximum, prolonged high impact SPL performance from a comparatively small footprint. Featuring the very latest materials and design innovations, it contains a state-of-the-art very large displacement 21” Neodymium transducer with an all-carbon fibre cone, for high pressure loading, and a force-ventilated 5.3” voice-coil with low resistance 4 ohms impedance.

The BQ211 quarter-wave loaded subwoofer system is designed to offer maximum, prolonged very high impact SPL performance from a relative small footprint. The 21” Neodymium transducer with all-carbon fiber (cone + dust cap) features a 5.3” voice-coil with vented triple-spider and port-vented magnet structure to maximally reduce power compression. The quarter wave pipe principle in combination with two tuning frequencies, forms a true wideband subwoofer with high SPL performance down to the lowest frequencies. An additional front-positioned NL4 connector caters for easy “reverse connection” in cardioid subwoofer arrays. The BQ211 is powered and controlled by the ALC amplified loudspeaker controller; the ALC offers BQ211-specific drive processing with response optimisation, dedicated power and excursion protection, hybrid filtering and cardoid processing. Through the SIS™ (Signal Integrity Sensing) circuit, the cable-length and connector resistance between the BQ211 and ALC is completely compensated (damping factor 10.000), further increasing response accuracy.

- Double-tuned, quarter-wave loaded high-impact subwoofer system
- Neodymium 21” woofer with all-carbon cone for high pressure loading
- Large, rounded vent for improved breathing and low port compression
- Force-ventilated 5.3” voice-coil for low power compression prolonged performance
- Birch enclosure with extensive bracing brings lightweight yet rigid cabinet construction
- SIS pre-wired for very high damping and further reduced distortion (with ALC)
- Durotect™ flexible and scratch-resistant coating