REL Acoustics S/850 Subwoofer in White Gloss - REL Acoustics

For the Piano Black version Click Here.

A Template for Greatness: S/850
S/850 is built for uncompromising performance, blending power with refinement. Featuring an 850-watt Linear Class D amplifier, advanced CarbonAlloy™ drivers, and innovations from our Reference line, it delivers explosive dynamics, nuance, and effortless scale.

• 850-watt Linear Class D Amplifier
• 12" CarbonAlloy™ Active Driver with 12" Long-Stroke Passive Radiator
• Music & Theater Systems, Medium-to-Large Rooms
• Stereo Pairs & Line Arrays

Stunning Design Meets Raw Power
S/850 stands as the benchmark of the Serie S line, with its design innovations shaping and elevating its three stablemates. Every improvement is sweeping and comprehensive, ensuring the entire Serie S family benefits from the advancements pioneered in the S/850.

The results are spectacular: it delivers incredible attack and output beyond even the former Carbon Special at the very limits of performance, yet with the precision, quietness, and clarity that produce true dynamic range. Lightning-fast transients, deep effortless bass, and tonal richness combine to deliver nuance that elevates both music and theater.

Designed to be Perfect
The S/850 is the result of relentless refinement. This progress comes not only from exploring newer, finer materials, but also from the thousands of hours of critical listening our team undertakes each year—experience that transforms raw engineering into musical and theatrical performance of the highest order. With every detail carefully considered, the S/850 delivers a level of power, nuance, and scale that redefines what’s possible in its class

S/850 drivers now feature lightweight pure carbon-fiber center caps, replacing the solid aluminum moldings of earlier models. These caps reduce moving mass while stiffening the cone, resulting in explosive dynamics and the ability to resolve the quietest passages with delicacy and nuance. Feather-light yet rigid, they extend performance at both extremes—a hallmark of REL design.

Monoblock Slam, Class D Efficiency
The S/850’s amplifier delivers the slam of massive Class A/B monoblocks while harnessing the efficiency of a modern Class D output stage. Supported by a robust traditional power supply, it produces 850 watts of continuous output and can surge to 1,000 watts during demanding peaks, ensuring ample headroom for both music and theater. Upgraded input filters, equipped with the same thin-film capacitors used in our flagship designs, introduce a new level of transparency and refinement previously unheard of in this class. Together, these advancements create dramatic improvements in clarity, sound staging, and sheer authority—an amplifier that blends brute force with finesse to anchor the performance of the entire Serie S line.

Analog Filtered to Perfection:
We choose analog because it is the only way to achieve truly natural sound. All REL input filters are 100% analog—among the fastest ever offered in a subwoofer. At the core is our renowned High Level Input, which connects directly to the speaker outputs of your main amplifier. This doesn’t draw power; instead, it carries the full sonic signature of your system, allowing REL to blend seamlessly with your speakers—a quality reviewers have praised for decades.

For systems where High Level isn’t possible, our low-level input uses the same analog filter circuit, available via both RCA and XLR connections, to deliver the speed, naturalness, and integration REL is known for. And in theater or dual-use systems, REL uniquely allows High Level and .1/LFE to run together—so music benefits from natural integration, while movies deliver the full impact intended by the mix.

Serie S Line Array
REL Line Arrays are renowned for their sound staging and dynamics—performance that continues to set the standard in the high-end audio community. Like all REL Line Arrays, they’re designed to grow with the listener: start with a stereo pair, expand to four, and ultimately rise to six units for true floor-to-ceiling authority. Precision mechanical couplers tie each upper unit securely to the anchor REL on the floor, ensuring both stability and seamless performance.

The S/550 serves as the gateway into this world, offering a scalable path into Line Array performance. Stepping up, the S/850 brings greater scale, weight, and authority—proven at international shows to elevate finely matched systems. The effect is transformative: vocals gain striking presence, instruments bloom with natural dimension, and cinematic effects explode with realism. A true state-of-the-art experience, made both scalable and accessible.

Wired For Sound…Wirelessly
Sometimes the best wire is no wire. Quality cables are a given in high-end audio systems, but there are occasions where it is impractical, unsafe, or unsightly to drape a cable across the room. REL delivers the ultimate solution with Airship Direct™, our optional wireless system that transmits wide-bandwidth, compound signals, carrying both High Level and .1/LFE simultaneously. Even with the scale and output of S/850, Airship Direct™ preserves the speed, transparency, and authority that define REL. It allows seamless transitions between music and movies without ever touching the controls, all from a single module that plugs neatly into the rear panel and stays invisible in your room. Simple, direct, uncompromised: Airship Direct™.

What to expect in the box:

• Serie S/850 Subwoofer
• 6' AC Power Cord
• 32' Neutrik Speakon cable
• Line Array Mounting Hardware
• Cloth Grille
• User Manual and Warranty Information
• *The Premium Wood Grille is NOT included in your subwoofer purchase but is available for purchase.

Product Details:

• Type: Front-firing active driver, down-firing passive radiator
• Active Drive Unit: 12 in. (305mm) long-throw, CarbonAlloy™ cone structure, die cast alloy chassis
• Passive Radiator: 12 in., (305mm), Carbon/Carbon flat cone structure, steel chassis
• Lower Frequency Response in Room: -6 dB at 19Hz
• Input Connectors: High Level Neutrik Speakon, Left and Right Low Level phono, LFE phono, LFE XLR
• Output Connectors: High Level Neutrik Speakon, , Low Level RCA, LFE XLR
• Gain Control Range: 80 dB
• Power Output: 850 watts (RMS)
• Phase Switch: Yes, 0 or 180 degrees
• Amplifier Type: Linear Class D
• Wireless capability: Yes- REL AirShip [required]. Sold separately
• Protection System
• Fully Electronic with SET-SAFE: Yes
• D.C. Fault: Yes
• Output Short: Yes
• Mains Input Voltage: 220-240 volts, 110-120 volts for certain markets
• Fuses: 8 Amp semi delay 220 volts operation, 15 Amp semi delay 120 volts operation
• Dimensions
• W x H x D, Including Feet and Rear Panel Controls: 19.25 x 16.125 x 21.25 in., (488 x 410 x 540 mm) Add 1.75in (44.5mm) in depth when using Hi Level connector
• Net Weight: 93.5 lbs. (42.5 kg)
• Finish: Piano Black Lacquer or Gloss White Lacquer, 8 coats

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