REL S/550 Subwoofer

The REL S/550 is the gateway to the Serie S line, combining compact proportions with serious output and control. A 550-watt Pure Class D amplifier drives a new 10 inch CarbonAlloy™ active driver and a 12 inch down-firing passive radiator, delivering speed, depth, and dynamic headroom for both music and theater systems. 

The S/550 is the smallest of the four Serie S models and, in REL's words, identical in quality to its larger stablemates; it substitutes a 10 inch driver and a smaller amplifier. For listeners who want Serie S speed and depth without stepping up to a larger cabinet, the S/550 is the perfect balance of power, speed, and refinement

Key Features

• 550-watt Pure Class D amplifier designed for continuous high output with stability and control.
• 10 inch CarbonAlloy™ active driver with redesigned suspension and carbon fiber cap for fast attack and natural decay.
• 12 inch Carbon/Carbon passive radiator extends response with authority to 19 Hz.
• Built for both two channel music systems and multichannel home theater.
• Stereo pairs and line arrays supported for scalable performance in larger spaces.
• High Level Neutrik Speakon input preserves the sonic character of your main amplifier for seamless integration.
• .1/LFE inputs on RCA and XLR for cinema systems, with simultaneous connection support.
• Wireless ready via the optional REL Airship Direct receiver, which plugs into a dedicated connector on the rear panel, for flexible placement without long cable runs.
• Premium finishes in Piano Black or Gloss White, with optional Premium Wood Grille (natural grain and color variations are expected).

Design

The cabinet increases internal volume while remaining visually light. Horizontal strakes and elliptical returns frame integrated handles with a warm golden silver finish. Internal bracing controls resonance, badges recess into the grille cloth, and model markings are etched discreetly into the front rails for clean stacking in a line array. Front rail leveling adjusters simplify setup on uneven floors. The optional Premium Wood Grille adds a bespoke touch with unique grain and tone for each piece.

Driver

The 10 inch high amplitude CarbonAlloy™ driver is a ground up redesign, retaining only the cast frame from the prior generation. A carbon fiber center cap increases stiffness where it matters, sharpening transient attack and smoothing decay so notes fade naturally. The new suspension allows greater linear excursion, enabling higher output with less strain. A 12 inch down firing Carbon/Carbon passive radiator complements the active driver to extend low frequency energy while maintaining control.

Amplifier

The Pure Class D module is rated at 550 watts RMS and has been tested at 600 watts continuous without signs of stress. Crest power exceeds the previous generation by fifty percent. Premium polypropylene capacitors in the input filters, borrowed from REL Reference designs, open the soundstage and improve transparency. REL’s second generation PerfectFilter™ optimizes very low frequency behavior so the S/550 remains articulate and composed at depth.

Integration and Connectivity

REL’s 100 percent analog high level input connects to the speaker outputs of your main amplifier to carry its full sonic signature, which is a proven path to seamless blend with your mains. Low level stereo RCA and dedicated .1/LFE on RCA and XLR support theater builds, and the inputs can be used in tandem for mixed music and cinema systems. Wireless operation is available with the optional Airship Direct receiver, which carries both the High Level and .1/LFE signals, for installations where cabling is impractical.

The Listening Room Difference

We are a third-generation, family-owned hi-fi shop in Chestertown, Maryland, known for service and trust rather than hype. Every system begins with a conversation about your room, your music, and your goals, and the advice you receive comes directly from our owner, Mike Hoatson, and our small, dedicated team. We offer white-glove delivery, careful setup, and ongoing support so your system performs as it should. We do not just ship boxes, we build relationships that last well beyond the sale.

Specifications