The REL S/550 delivers a powerful, precise sound; it responds lightning-fast to nuances in the bass without jumping or going overboard. Whispers and outbursts—that’s what a REL can do.
The REL S/550 is a powerful subwoofer from REL that delivers deep, tight bass reproduction for demanding audio setups. This REL subwoofer offers impressive dynamics and detail without pressure or distortion, significantly enriching the soundstage in both stereo and multichannel playback. The sound of the REL S/550 feels natural and all the more musical, with balanced bass reproduction that supports the performance in both movies and music.
The REL S/550 subwoofer integrates seamlessly with existing systems, adding weight to percussion, basslines, and effects while maintaining an open stereo image. You’ll hear nuances in the low-frequency response that were previously hidden, with a level of detail that fills the room without dominating it. Thanks to its refined tuning, the subwoofer remains responsive and controllable—essential for those seeking both clarity and power in a single package.
Stop by our listening room to experience the REL S/550 and hear for yourself how it handles the bass in your system. Would you like to compare it with other subwoofers or discuss a trade-in option? Schedule a listening session today and find out if this REL S/550 is a good fit for your audio setup.
Type: Front-firing active driver, down-firing passive radiator Active driver Size & Material: 10-inch (250 mm) long-throw, CarbonAlloy™ cone structure, die-cast aluminum chassis Passive radiator Size & Material: 12 inches (305 mm), Carbon/Carbon flat cone, steel chassis Low-frequency extension: -6 dB at 19 Hz Inputs: High-level Neutrik Speakon, 2× low-level RCA, 1× LFE RCA, 1× LFE XLR Outputs: High-level Neutrik Speakon; 1× RCA low-level; 1× LFE RCA or LFE XLR Power: 550 W RMS Amplifier Type: Pure Class D Phase: Switchable between 0° and 180° Wireless Capability: Compatible with REL AirShip Direct modular system (sold separately) Cabinet Finish: Piano Black Lacquer or Gloss White Lacquer, 8 layers of lacquer Protection Systems: Electronic Set-Safe, DC fault detection, short-circuit protection Mains Voltage: 220–240 V, 110–120 V depending on market Fuses: 8 A for 220–240 V, 15 A for 110–120 V Dimensions (W×H×D): 445 × 372 × 500 mm Net weight: 31 kg
The REL S/550 was developed by the engineers at REL Acoustics with a focus on pure sound quality and power. This subwoofer utilizes an active and passive driver system made of carbon fiber composite, ensuring tight and detailed bass reproduction. The enclosure is made of thick MDF with a high-gloss finish, which minimizes resonance. REL uses high-quality internal wiring, selected for optimal signal purity. The amplifier in the S/550 delivers high power reserves, essential for dynamic and accurate bass reproduction, while their manufacturing process is meticulously designed to ensure consistency and performance.
REL Acoustics was founded by Richard Edmund Lord, born in 1939. After a stint as a radio operator in the merchant marine, he founded the company with the goal of building the best subwoofers. In 1990, REL introduced the High Level Input, which derives the input signal from the power amplifier, allowing for seamless integration with speakers. In 1998, the company developed the ABC Input Filters and High Current Amplifiers, focused on precise crossover settings and providing sufficient power for subwoofer drivers. After an acquisition in 2005, new ideas and technologies were introduced, including NaturalSound Filtering in 2007 and Carbon Fibre Driver Cones in 2010. In 2014, REL launched Zero Compression Wireless, followed by the No. 25 Anniversary Model in 2016 and the Series HT in 2018.
