Description S/550 S/550 is the gateway to the REL Serie S range, delivering the speed, depth, and nuance that define REL’s performance ethos. While its larger sibling, the S/850, sets the ultimate benchmark, the S/550 carries forward many of the same design innovations—ensuring the essence of Serie S is fully realized in a more compact form. The results are remarkable: S/550 offers lightning-fast transients, deep articulate bass, and tonal balance that breathes life into both music and film. Its ability to combine authority with refinement makes it an ideal choice for those seeking a true high-end experience in medium-sized systems, with performance that consistently exceeds expectations. For those seeking a more bespoke finish, S/550 is available with an optional Premium Wood Grille upgrade for added warmth and individuality. Power Bass Rated at 550 watts, the Pure Class D amplifier outpaces its predecessor – but numbers tell only part of the story. In the REL lab, this unit delivers 600-watts continuous with no strain for extended periods of time, not simply for an instant. The unit’s crest power is fully 50% more than its predecessor. It delivers the fast, truly deep bass Serie S is known for, performance that defies spec sheets. Design Take in the design as a whole: horizontal strakes carved into the side walls, elegant elliptical returns that cradle handles finished in a warm golden-silver, echoing raw titanium. Everywhere you look, thoughtful details emerge—but the purpose is clear. This generation delivers the seemingly impossible: a larger cabinet that is lower, wider, and deeper, yet visually lighter. The added internal volume gives drivers greater freedom and amplifiers improved efficiency, while updated internal bracing keeps cabinet resonances firmly under control. Subtler touches also make a difference, badges that disappear into the grille cloth, silver accents that rest quietly within the cabinet plane, and model numbers etched discreetly into the front rails, visible only when stacked in a Line Array. Driver The new S/550 10-inch high-amplitude driver has been completely rebuilt—only the cast frame remains. Its CarbonAlloy™ cone, capped with pure carbon fibre, sharpens attack and smooths decay, letting notes fade naturally into silence. A redesigned suspension allows greater travel, easily handling the amplifier’s added power. In listening, the driver feels supple and effortless, free from strain. Because it’s lighter, the amplifier works less, yet delivers more power, allowing the driver to move further and play louder than ever before. The result is nothing short of a revelation. Features 550-watt Pure Class D Amplifier 10-inch CarbonAlloy™ Active Driver with 12-inch Down-Firing Passive Radiator Music & Theatre Systems, Medium Rooms Stereo Pairs & Line Arrays Optional Premium Wood Grille Available Specifications Type: Front-firing active driver, down-firing passive Active Driver Size & Material: 10 in. (250 mm) long-throw, CarbonAlloy™ cone structure, die cast alloy chassis Passive Radiator Size & Material: 12 in. (305 mm), Carbon/Carbon flat cone structure, steel chassis Low Frequency Extension: -6 dB at 19 Hz Input Connectors: High Level Neutrik Speakon, Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR Output Connectors: High Level Neutrik Speakon, (1) Low Level RCA, (1) LFE RCA or (1) LFE XLR Power Output: 550 watts (RMS) Amplifier Type: Linear Class D Wireless Capability: REL AirShip Direct (sold separately) Finish: Piano Black Lacquer, Gloss White Lacquer, 8 coats Dimensions (W x H x D): 445 x 372 x 500 mm Net Weight: 31 kg Included S/550 Subwoofer Mains Power Cable Neutrik Speakon Cable Documentation Full REL Acoustics Range Available Unilet Sound & Vision are official retail partners for REL Acoustics, providing sales, advice and assistance on their entire range of high-quality products. Please do get in touch if you would like a demonstration or wish to purchase. More Information S/550 Subwoofer, by REL Acoustics
