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REL ACOUSTICS 212 SX
Reference active subwoofer with four 305 mm drivers.
Two carbon-reinforced “Continuous Cast Alloy” active front woofers
One rear and one lower passive radiator (Carbon/Carbon type)
1,000 W RMS NextGen5 Class D amplifier
Frequency response: down to 18 Hz (-6 dB)
Cross-tuned filters for stereo and home theater
Inputs: Speakon, RCA, and XLR (line and LFE)
Compatible with REL AirShip wireless connection (optional)
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REL 212/SX. Pure Power and Precision
Inspired by the aesthetics and engineering of the iconic 212/SE, the REL 212/SX stands as the pinnacle of reference subwoofer design. Its goal is not only to deliver visceral impact with every bass note, but also to restore warmth and midrange detail while enhancing the overall soundstage—whether in high-end stereo or home theater systems.
Featuring four 305 mm (12") drivers—two active front-firing and two passive (one rear, one downward)—and a powerful 1,000 W NextGen5 Class D amplifier, the 212/SX delivers an immersive, articulate, and truly monumental acoustic experience.
Reference-Level Acoustic Design
2 front-firing active drivers with Continuous CastAlloy cones, reinforced with rear-mounted carbon fiber blades for improved rigidity and controlled response.
1 rear-firing passive radiator with the same alloy cone, enhancing harmonic richness and reinforcing frontal output.
1 downward-firing passive radiator with REL's exclusive flat Carbon/Carbon diaphragm and a steel frame, capable of 30 mm of excursion to deliver added low-end pressure and sub-bass extension without compromising spatial definition.
Every component is engineered to maximize dynamics, depth, and accuracy while preserving musical coherence and avoiding room overload.
Advanced Electronics
NextGen5 1,000 W RMS Class D amplifier, offering ultra-fast transient response and rock-solid stability, even at high volumes.
Optimized internal filters tailored for multichannel inputs, making it an ideal choice for reference-grade AV systems.
Extended frequency response down to 18 Hz (-6 dB), delivering true full-range bass for demanding applications.
Versatile input options: high-level Neutrik Speakon, RCA (line/LFE), and balanced XLR (LFE).
Wireless compatibility with REL’s AirShip™ zero-compression wireless system (optional).
Build & Finish
Crafted from high-density panels with optimized thickness to eliminate unwanted cabinet resonances, the 212/SX features a slim vertical profile for easier room integration, while maintaining REL’s signature robust and elegant design.
Technical Specifications
Configuration: Active subwoofer with 2 active + 2 passive 305 mm (12") drivers
Cabinet type: Closed with front, rear, and down-firing output
Amplifier: 1,000 W RMS NextGen5 Class D
Frequency response: 18 Hz (-6 dB)
Inputs:
Neutrik Speakon (high level)
RCA (line/LFE)
XLR (LFE)
Wireless: AirShip compatible (optional)
Protection: Integrated electronic safeguards
Dimensions (W x H x D): 362 x 838 x 514.5 mm
Weight: 58 kg
Finish: Gloss piano black
The REL 212/SX is not just a subwoofer—it’s a statement piece for discerning audio lovers seeking the perfect balance of power, control, and musicality without compromise.
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