REL S/850 Subwoofer - 850W Linear Class D Flagship for Large Rooms

The REL S/850 sets the benchmark for Serie S performance, combining an 850-watt Linear Class D amplifier with advanced CarbonAlloy™ drivers and Reference line innovations. Built for uncompromising performance in medium-to-large rooms, it delivers explosive dynamics with exceptional nuance and effortless scale. Reserve your S/850 today and experience flagship-level bass reproduction.

Key Features

• 850-Watt Linear Class D Amplifier: Monoblock slam with Class D efficiency, 1,000W peak capability
• Advanced CarbonAlloy™ Drivers: 12" active driver with carbon-fibre centre caps, 12" long-stroke passive radiator
• Reference Line Technology: Flagship innovations throughout for ultimate performance
• Large Room Optimisation: Perfect for demanding installations and critical listening
• Line Array Ready: Professional couplers for scalable multi-unit configurations
• Premium Finishes: Piano Black or Gloss White lacquer, optional Premium Wood Grille
• Wireless Compatible: REL AirShip Direct™ ready for cable-free installation

Benchmark Engineering Excellence

The S/850 defines the Serie S line-up, with design innovations that elevate every model in the family. It delivers incredible attack and output beyond the former Carbon Special, yet with precision and clarity that produces true dynamic range. Lightning-fast transients, deep effortless bass, and tonal richness elevate both music and theatre performance.

Revolutionary Driver Technology

Pure carbon-fibre centre caps replace aluminium mouldings, reducing moving mass whilst stiffening the cone for explosive dynamics and delicate nuance. The 12" CarbonAlloy™ active driver works with a specially engineered 12" long-stroke passive radiator, extending performance at both frequency extremes—a hallmark of REL design.

Advanced Amplification

The Linear Class D amplifier delivers monoblock-level slam with modern efficiency. Supporting 850 watts continuous output with 1,000-watt peaks, it features upgraded input filters with thin-film capacitors from REL's Reference designs. The result: dramatic improvements in clarity, soundstaging, and authority.

Premium Design & Build Quality

The S/850 cabinet features proportions that convey dynamic presence—longer, lower, wider, and deeper. Clean creases catch light, warm silver-gold badges provide titanium-like finish, and stainless-steel handles recess into graceful ellipses. Precision-milled billet levelling adjusters and reinforced stacking capability ensure professional installation standards.

Line Array Scalability

REL Line Arrays are renowned for exceptional soundstaging and dynamics. Start with a stereo pair, expand to four, ultimately rising to six units for floor-to-ceiling authority. Precision mechanical couplers ensure stability and seamless performance, creating transformative results where vocals gain presence and instruments bloom naturally.

Advanced Connectivity

REL's 100% analogue input filters achieve truly natural sound. The renowned High Level Input connects directly to amplifier speaker outputs without drawing power, carrying your system's complete sonic signature. The optional AirShip Direct™ wireless system preserves speed, transparency, and authority whilst eliminating cables entirely.

Technical Specifications

• Configuration: Front-firing active, down-firing passive
• Active Driver: 12" CarbonAlloy™ with carbon-fibre centre caps
• Passive Radiator: 12" Carbon/Carbon flat cone, steel chassis
• Frequency Response: -6dB at 19Hz
• Power: 850W RMS, 1,000W peak
• Amplifier: Linear Class D with traditional power supply
• Inputs: High Level Speakon, (2) RCA, (1) LFE RCA, (1) LFE XLR
• Finishes: Piano Black or Gloss White Lacquer (8 coats)
• Wireless: AirShip Direct™ compatible

The S/850 represents relentless refinement and thousands of hours of critical listening, transforming engineering into musical performance of the highest order. Every detail serves ultimate emotional connection through sound, delivering power, nuance, and scale that redefines what's possible in its class.