- Double-tuned, quarter-wave loaded high-impact subwoofer system
- 21” woofer with all-carbon cone for high pressure loading
- Large, rounded vent for improved breathing and low compression
- Force-ventilated 5.3” voice-coil for low power compression prolonged performance
- 15mm birch 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
|The BQ211 is a quarter-wave loaded subwoofer system, extending the low frequency response of Alcons’ pro-ribbon systems, in both permanent and portable applications. Featuring a state-ofthe- art 21” Neodymium transducer, this subwoofer is designed to offer maximum, prolonged high impact SPL performance from a relative small footprint. For this, the latest materials and innovations have been applied: A very large displacement transducer with all-carbon fiber cone + dust cap, 5.3” voice-coil with vented triple-spider frame plus optimized low resistance impedance, and port-vented magnet structure to maximally reduce power compression.
The extensively internally-braced cabinet features features double-tuned, high-pressure loading, through a rounded 236mm diameter low-tuned bass-reflex vent and a wide, high-tuned quarter wave tunnel. This provides optimised breathing at high SPLs, yet keeping the total system weight to a minimum.
The BQ211 is powered and controlled by the ALC amplified loudspeaker controller; Through the SDP™ (Speaker Drive Processor) circuit, 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.
Typical applications for the BQ211 include groundstacked sub-bass extension of main sound systems, used in multiples depending on the application and sound pressure level / dispersion pattern control requirements.
|+/- 3 dB||33 Hz – 150 Hz|
|+/- 10 dB||27 Hz –|
|Sensitivity (SPL 1W/M)||100 dB|
|Nominal Impedance||4 ohms|
|Recommended drive||ALC4 min., 1 pce. per channel (4 ohms)|
|SPL program/peak (nom.)||135dB (ALC 6) / 140dB (comparative)|
|Dispersion H x V (array)||omni / (hyper) cardioid in array with processing|
|System||subwoofer, bass reflex + quarter wave pipe|
|Drivers LF||1 x AW21.6NDC/4 21″ double vented|
|Connectors||3 x Speakon NL4 input / link (rear)
|Weight (approx.) BQ211||82kg|
|Weight (approx.) BQ211i||72kg|
|Warranty||6 years limited|