SERIE S

212/Sx

$5,399

A stellar performer, now delivering more power with effortless clarity—elevating volume, enhancing precision, and preserving the finest nuances of air and space like never before.

  • 1,000-watt NextGen 5 Class D Amplifier
  • 12" Continuous CastAlloy™ Active Drivers (2)
  • 12" Rear-Firing Passive Driver
  • 12" Down-Firing Passive Driver
Setup:One Subwoofer
212/Sx
  • Single Subwoofer
$5,399
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Delivering More Than Sound

3 Year warranty

3 Year warranty

Lifetime Customer Support

Lifetime Customer Support

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The Powerful 212/SX

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.

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.

Design

Double Down

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” (300mm) 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.

Driver

Sound Beyond Its Size

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.

Amplifier

NextGen 5 1,000w Digital Amplifier

With incredible reliability in units now numbering in the thousands, the NextGen 5 Class D 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.

Wireless

Futureproof 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.

Specifications
Technical Specifications
Type

(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, die cast alloy chassis

Passive Radiator Size & Material

Rear: 12 in. (300mm) Continuous CastAlloy™ cone structure, die cast alloy chassis; Down: 12 in. (300mm) Carbon/Carbon flat cone structure, steel chassis

Low Frequency Extension

-6dB at 18 Hz Low Frequency

Input Connectors

High Level Neutrik Speakon, Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR

Output Connectors

High Level Neutrik Speakon, (1) LFE RCA or (1) LFE XLR**

Power Output

1,000 watts (RMS)

Amplifier Type

NextGen 5 Class D

Wireless Capability

REL AirShip II (sold separately)

Dual Parametric Filter

N/A

Finish

Piano Black Lacquer

Protection System
Fully Electronic Set Safe

Yes

D.C. Fault

Yes

Output Short

Yes

Mains Input Voltage

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

Fuses

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

Supplied Accessories
Mains Lead

Yes

Neutrik Speakon

Yes (10 Meters Nominal)

Interconnect

N/A

User Manual

Yes

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

Dimensions
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)

Awards & Industry Reviews

Home Cinema Choice
Home Cinema Choice Best Buy Award

"This REL's performance is surprisingly nuanced – yet there is no lack of clout. Massive explosions: check. Stomach churning LFE: check. Nosebleed-inducing deep notes so far above 100dB volume they will rip the mic out of your iPhone trying to measure it: check."

- Home Cinema Choice

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AV Tech Media
Best High End Subwoofer 2021

"Buyers will expect REL's 212/SX to drop deep and go loud – and it does – but what stands out even more than this premium subwoofer’s weighty performance is its nuance, precision and sense of timing."

- AV Tech Media

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Secrets of Home Theater and High Fidelity
Best of 2022

"What REL is doing with their subwoofer design and development, particularly with how they utilize high-level input signals, they are single-handedly. raising the bar in the audio industry on what can be accomplished in low-frequency reproduction."

- Secrets of Home Theater and High Fidelity

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The Absolute Sound
2023 Editors' Choice Award

"The REL 212SX was designed to offer clean prodigious deep bass output at a reasonable price. In a beautifully finished piano-black cabinet, each 212SX houses two front-facing 12″ drivers made of continuous cast alloy and capable of 2″ linear excursion."

- The Absolute Sound

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"I highly suggest getting a pair to start out with. You'll be glad you did. Enthusiastically recommended. Cliché as it sounds, the REL 212/SX is not something you will be able to unhear once you've experienced it."

- TONE Audio

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avforums
Best In Class

"The REL 212/SX is a thing of beauty. With its piano gloss lacquer, finely crafted borders and mechanical features, it even looks like a musical instrument. That’s not an accident. If you want bass to sound - and look - the very best, then this subwoofer ticks all the boxes. If you’re mulling over subwoofers in the price bracket, we say go and book an audition at your nearest dealer. It will be worth the journey."

- avforums

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avforums
Best High-End Subwoofer 2023/2024

"... to find a subwoofer which sounds good pretty much wherever you put it in a small cinema is a revelation. The REL 212/SX can cast its net of bass frequencies seemingly in a massive orb radiating out in all directions."

- avforums

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212/Sx
212/Sx
212/Sx

What's in the box

  • Serie 212/SX Subwoofer
  • Power Cord
  • User Manual and Warranty Information

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-6 dB at 19Hz Low Frequency (in Room)
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Learn & Explore The 212/Sx

View All Articles & Videos

212/SX Video Overview

Watch as the Lead Designer walks through the features of the 212/SX

212/SX or not 212/SX, That is the Question

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