The S/510 was one of the most successful models we’ve ever built—praised for its compact form factor, musicality, and sheer versatility. With the new S/550, we didn’t just improve it, we transformed it. This isn’t a refresh, it’s a reinvention—one that adds scale, richness, and dynamic presence while preserving the speed and agility that made the original so beloved.
A Strong Foundation, Reimagined
At the heart of the S/550 is a 12-inch driver refined with carbon fiber enhancements for lighter mass, faster reaction, and greater control. Paired with a newly re-engineered carbon-fibre-infused passive radiator, it delivers deeper extension and more precise energy release. The result is bass that carries greater heft and body, while remaining fluid and articulate.
Amplification With Explosive Precision
The S/550 is powered by a 550-watt Pure Class D™ amplifier—engineered for efficiency and speed, while consuming just 13 watts at idle. This design provides effortless headroom, lower distortion, and lightning-fast transients, ensuring the S/550 remains expressive at all volumes—subtle when needed, explosive when called upon.
Built to Integrate, Built to Disappear
The S/550 exemplifies REL’s philosophy of seamless integration. With its lighter, faster drivers and refined cabinet bracing, it achieves what we call “quiet speed”—allowing notes to bloom and decay naturally. Whether in a two-channel system, a dual-use room, or stacked in Line Arrays, the S/550 steps in effortlessly, enriching your system without ever calling attention to itself.
Refined Design, Flexible Style
Available in Piano Black or Gloss White lacquers, S/550 ships with a classic cloth grille, while an optional premium wood grille offers an elevated Mid-Century Modern touch. Its compact footprint makes it easy to place, and with Airship Direct™ wireless connectivity, setup is as elegant as the sound it delivers.
Who It’s For
If you loved the S/510, the S/550 is everything you appreciated—just more of it. More power, more speed, more tonal color, and a larger sense of scale. Perfect for smaller listening rooms that require uncompromising performance, or as part of a larger multi-sub system.
Compact yet commanding, the S/550 is proof that refinement and authority can live in the same cabinet.
—John
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