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REL Acoustics NO 31 Subwoofer (Active / Powered) Brand new REL Reference No. 31 Subwoofer beautifully engineered a real showpiece and the most musical subwoofer you’ll not actually hear. This Sub is only 4 weeks old but we are moving house and has to go. Designed to be the absolute pinnacle of Subwoofers I know I will regret this, I love it so much I bought 2 and want to try and keep one through the moving process. At 52 Kilos and with a 900 Watt Class D Amplifier attached it can do anything and the newly designed Carbon-Fire 350mm Driver lets you feel it all. Free delivery around Melbourne an
Condition matters a lot here, because new was A$12,999 in Australia, so a used asking price of A$10,999 is only a modest discount unless the unit is truly exceptional. Against the broader market, that sits above the typical used sweet spot for a flagship REL sub like this, so I’d call it ambitious rather than a bargain; it starts to make sense only if the unit is near-mint, lightly used, and complete with the original remote, feet, grille, and packaging.
That said, the No.31 is a serious piece: a 900W amp, 12-inch carbon driver, sealed cabinet, and proper high-level and XLR connectivity make it a top-tier choice for music-first systems and smaller-to-medium rooms. The upside is real if you want deep, controlled bass with REL’s usual speed and integration, and if the seller can document careful ownership and clean operating history, it’s still a premium buy—just not priced like a sleeper deal.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
REL Acoustics traces its origins to the inventive mind of Richard Edmund Lord, the man behind the brand's acronym, who founded the company in the United Kingdom around 1990 out of frustration with the subpar subwoofers available at the time. Dissatisfied with conventional low-frequency solutions, Lord crafted his own mammoth custom design, integrated into a bay window, which quickly earned acclaim from audiophiles as the finest they had encountered. This grassroots beginning in a tiny workshop marked the start of REL's relentless pursuit of audio perfection, evolving through innovations like the revolutionary High-Level Input that connects directly to a main amplifier's speaker outputs for seamless integration.
The brand specializes exclusively in powered subwoofers, eschewing amplifiers, speakers, turntables, DACs, headphones, or cables to focus intently on sub-bass systems. Early models like the Strata 2, Stadium, and Britannia range established REL's signature forward-firing designs and simplified crossovers, while later series such as T/x and the reimagined Serie S—launched in 2025 with models like the 212 Black Label and S/850—refine musicality, style, and power. Acquired in 2005 by John Hunter and Donald Brody, REL modernized its aesthetics and engineering without diluting its core philosophy.
REL commands a prestigious niche in the high-end hi-fi market as the preeminent authority on subwoofers, revered by discerning audiophiles for transforming even elite $15,000-to-$20,000 speaker systems into reference-caliber performers. Its boutique status stems from unwavering innovation and musical fidelity, positioning it as an essential upgrade for serious setups rather than a mass-market or mid-tier option.
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