Rel S/850 Subwoofer

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S/850 is engineered for listeners who want uncompromising performance with a refined, musical touch. Drawing on innovations from our Reference line, it pairs an 850-watt Linear Class D amplifier with advanced CarbonAlloy™ drivers to deliver explosive dynamics, clarity, and effortless scale. Equally at home in high-end music systems or immersive theaters, S/850 brings control and confidence to medium-to-large rooms.


Sale price$7,799.00
Colour: Piano Black
Options: None

Key features

Linear Class D

850 watts (RMS)

12 in. (305mm) long-throw, CarbonAlloy™

Piano Black Lacquer, Gloss White Lacquer 8 coats

Front-firing active driver, down-firing passive

Rel S 850 Subwoofer

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Rel S/850 Subwoofer

The REL Acoustics S/850 isn’t just a subwoofer—it’s a statement piece engineered for listeners who refuse to compromise between raw power and musical refinement. Built at the top of the Serie S lineup, it combines cutting-edge driver technology, a high-output amplifier, and meticulous acoustic tuning to deliver bass that is not only deep, but articulate and emotionally engaging.

Whether you’re building a high-end stereo system or a cinematic home theater, the S/850 integrates seamlessly while elevating the entire soundstage. Its ability to produce explosive dynamics without losing control or finesse makes it equally capable with delicate musical passages and thunderous movie effects.

Designed for medium-to-large rooms, it brings scale, authority, and precision that transforms how you experience sound. If you’re seeking a subwoofer that feels effortless yet commanding, the S/850 is built to exceed expectations at every level.

Rel S 850 Subwoofer

Massive 850W Power with Precision Control

The S/850’s 850-watt Linear Class D amplifier delivers immense power with exceptional control, ensuring tight, fast, and distortion-free bass even at high volumes. Unlike conventional designs that can sound bloated under pressure, this amplifier maintains composure and clarity during demanding peaks.

What makes it special is how it balances brute force with finesse—offering the slam of traditional Class A/B amplifiers while maintaining the efficiency and speed of modern Class D technology.

Rel S 850 Subwoofer

Advanced CarbonAlloy™ Driver for Speed and Detail

At the heart of the S/850 is a 12-inch CarbonAlloy™ active driver, engineered for both rigidity and lightness. This combination allows it to respond incredibly fast to audio signals, producing tight, accurate bass with exceptional detail retrieval. The addition of a carbon-fiber center cap further reduces moving mass while increasing stiffness, enhancing both dynamics and precision.

This means you don’t just hear bass—you feel its texture and nuance. From subtle low-frequency tones in music to deep cinematic rumbles, the driver ensures every detail is delivered with clarity and authority.

Rel S 850 Subwoofer

Passive Radiator for Deep, Effortless Bass

The S/850 uses a 12-inch long-stroke passive radiator that works in harmony with the active driver to extend bass depth without strain. With over 60mm of travel, it allows the system to move more air efficiently, producing deeper and more powerful low frequencies without distortion.

This design avoids the port noise common in traditional subwoofers, resulting in cleaner, more natural bass. The upgraded radiator is also significantly stiffer and lighter, which improves responsiveness and dynamic range, making low-end performance feel both effortless and impactful.

Rel S 850 Subwoofer

Seamless Integration with Any System

One of REL’s biggest strengths is how naturally their subwoofers blend with speakers, and the S/850 takes this to another level. Its 100% analog filtering and High-Level input allow it to capture the exact sonic character of your main amplifier, ensuring perfect tonal matching.

This creates a cohesive sound where the subwoofer disappears into the system rather than standing out. Whether you’re listening to music or watching movies, the bass integrates smoothly, enhancing the experience without overpowering the rest of the audio.

Rel S 850 Subwoofer

Built for Scalability with Line Array Capability

The S/850 isn’t limited to a single-sub setup—it’s designed to grow with your system. You can start with one unit, upgrade to a stereo pair, and eventually build a full line array with multiple subwoofers per channel.

This scalability allows you to achieve massive soundstage expansion, improved room coverage, and greater dynamic impact. It’s a future-proof investment that adapts as your system evolves, making it ideal for serious audiophiles and home theater enthusiasts aiming for reference-level performance.

Rel S 850 Subwoofer

Premium Design with Functional Engineering

Beyond performance, the S/850 is crafted with exceptional attention to design and build quality. Its cabinet proportions are optimized not just for aesthetics but also for acoustic performance, reducing resonance and enhancing stability. Details like recessed stainless-steel handles, precision leveling feet, and optional premium wood grilles add both practicality and visual appeal.

This is a subwoofer that looks as refined as it sounds—fitting seamlessly into modern interiors while maintaining the rugged engineering required for high-performance audio. It’s a perfect blend of luxury and functionality.

Rel S 850 Subwoofer

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