Serie S


212/SX builds on the strengths of the legendary 212/SE. Upgraded alloy drivers with carbon fiber blades are stronger, a new flat passive radiator extends even deeper and our PerfectFilter™ delivers crushing low bass with greater speed and air, taking 212/SX well beyond its illustrious predecessor.

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The Powerful 212/SX

Quality Meets Quantity

At REL, a deeper understanding of quality underpins everything we do. So, whilst 212/SX thunders and shakes foundations, it also resolves detail and restores midrange warmth to its correct balance. At 1,000 watts with (4) 12” (350mm) drivers, 212/SX drives rooms hard and in multiple modes which allows it to create richer bass everywhere in a room.

Refinements to both our legendary ultra-fast filters and newly developed drivers produces harder slam and brings to life quieter, gentler moments, improving system performance at both extremes. Plays brilliantly with both high end 2-channel and large power theatre applications.


Double Down

Twin Continuous Cast™ Alloy Bass Engines

Lightweight carbon fiber blades firmly attached to the rear of each active alloy cone serves to both strengthen the cone and quiet it. The twin 12” (350mm) active drivers now offer an additional 12mm of stroke and also benefit from updated suspension geometry and greater power handling. And a brand-new double-spider, high powered passive unit on the bottom delivers floor rippling low bass. The result is a major step forward in the 212 design, an already brilliant performer now playing louder with greater ease whilst better preserving the tiniest details of air and space with even greater precision.


Sound Beyond Its Size

Dual Continuous Carbon Passive Radiators

Our uniquely tuned passive radiators use special suspensions, now with an additional 30mm of linear travel, to produce performance far beyond conventional subwoofers. Our new SuperProgressive™ passive radiator produces extremely long travel allowing for very loud output while retaining the variable stiffness of its suspension.

The down firing passive produces deep, floor-crawling bass that makes a room shudder. Mounted above the amplifier panel on the rear is the second passive. This unit produces wrap around “atmospheric” bass that adds air and shimmer to the sound. Coupling with either the rear wall or the rear corner of a room allows for bass to develop exceedingly long wavefronts and adds an ease and effortless quality unique to single-box designs.


NextGen5 1,000w Digital Amplifier

Whoever said “Power Corrupts” Never Heard a 212/SX

With incredible reliability in units now numbering in the thousands, the Gen 5 amplifier is a paragon of extreme power and reliability. At 1,000 watts of output, plus the ability to connect both High Level and .1/LFE simultaneously with optional state of the art wireless, 212/SX delivers the goods at scale. It does so with incredible grip and control in the extreme deep bass where most amplifiers get loose and lose control.

212/SX has an almost limitless sense of power, coupled with precision. Where others offer brute strength, we deliver massive power and every secondary category of performance with ease and effortless versatility. Deafening output in a concert video or blockbuster movie? Check. Beautifully rendered female vocals accurately placed within a stone abbey? Check.


Futureproof Wireless

Airship Zero-Compression Wireless

We seized the opportunity to develop a new high resolution, audiophile-grade uncompressed wireless system for 212/SX and our newer offerings in the Reference range. Airship™ is a new 5.8 gHz military-based wireless system built into a monolithic LSI chip that delivers incredibly fast bass. We ship full bandwidth, not just bass, through this system that includes (2) channels. The first channel handles our High Level Input and can be used for both stereo bass or use of a single channel with monoblock amplifiers. Simultaneously, Airship will process the .1/LFE channel necessary for special effects in film so both RCA and XLR inputs are provided. In the future, we anticipate adoption of more active wireless loudspeakers reaching the market, so we included stereo low level inputs. With Airship, you’re ready for the future.

Customer Reviews

Based on 1 review
Powerful, Sublime Perfection in Sub Bass Performance

About a month ago I decided to trade up to the latest REL offering I believed to be the most suitable solution to replace my 18 month old SHO-S/5. The REL site in fact pointed me to its successor, the new S/510. REL referred me to a local dealer/installer in my market and we arranged for a home consultation prior to settling on this solution.

Once in my home, this dealer impressed me immediately as among the most knowledgeable authorities on sub bass I’d ever encountered. The dealer suggested that I “raise the scale “ by which I typically “measure” products - from “1-10” to “1-15” and posited, “What if I could prove to you that there is a higher level than 10? Would you be interested in transcending your highest expectations?” The answer of course was, “OK, tell me more.”

After my education I took the plunge and pulled the trigger on this 212/SX, and all I can say is, WOW! It’s been about 6 days since installation and this REL has completely transformed my system. I like to use the word “uplifting,” in describing the experience because this 212/SX is EMOTIONALLY uplifting just as it literally (sonically) uplifts the mids and the highs in the music spectrum. Sub bass is the core foundation in any good system, without which the mid range and and upper end frequencies cannot be be properly supported/revealed. But with the amazing performance of the 212/SX I am now hearing an audible level of detail, transparency and sound staging I’d not previously heard before the integration of this sub into my system. Every note from low to high seems to revel in the musical dance in a way I’ve never heard before. I can honestly say that no other component has so transformed my system more so than this 212/SX. And it’s not even fully broken in.

Finally I would just ad that it’s great REL has chosen excellent partners like my dealer here in my market to contribute to this most positive experience by engaging me in a way to expand my view of what’s possible. What’s possible with the 212/SX is truly remarkable, and I can’t recommend this sub highly enough.


Suggested Retail: $4,599

212/SX builds on the strengths of the legendary 212/SE. Upgraded alloy drivers with carbon fiber blades are stronger, a new flat passive radiator extends even deeper and our PerfectFilter™ delivers crushing low bass with greater speed and air, taking 212/SX well beyond its illustrious predecessor.



(2) Front-firing active drivers, (1) rear passive, (1) down-firing passive

Active Driver Size & Material

(2) 12 in., 300mm long-throw, Continuous CastAlloy™ cone structure, cast chassis

Passive Radiator Size & Material

(2) 12 in., 300mm Carbon/Carbon flat cone structure, steel chassis

Low Frequency Extention

-6dB at 18 Hz

Input Connectors

High Level Neutrik Speakon, Low Level stereo RCA, LFE XLR and LFE RCA

Output Connectors

High Level Neutrik Speakon, LFE RCA, LFE XLR

Power Output

1,000 watts (RMS)

Amplifier Type

NextGen5 Class D

Wireless Capability

Yes- REL AirShip system [required]. Sold separately.

Protection System

Fully Electronic Set Safe


D.C. Fault


Output Short


Mains Input Voltage

220-240 volts, 1120-120 volts for certain markets


7 Amp semi delay 220 volts operation, 15 Amp semi delay 120 volts operation


W x H x D

14 1/4in., x 33in., x 20 1/4 in., (362 x 838 x 514.5mm)

Net Weight

128 lbs. (58 kg)


Piano Black Lacquer

Supplied Accessories

Mains Lead


Neutrik Speakon

Yes (10 Meters Nominal)



Users Manual


In the interest of product development, REL Acoustics Limited reserve the right to vary these specifications without notice.