SUNNYVALE, CA — Four years after stunning the audiophile world with the launch of the critically acclaimed No.31 and No.32 Reference Subwoofers, REL Acoustics has returned to the drawing board to redefine the outer limits of low-frequency reproduction. The British-founded, American-based high-end audio specialist has officially announced its next-generation flagship products: the REL No. 35 and REL No. 36.
Priced at $10,000 USD and $12,000 USD respectively, these flagship subwoofers represent a masterclass in acoustic engineering, material science, and relentless sonic tuning. Built upon the philosophy that engineering perfection on paper is only the starting point, the new models promise to push the boundaries of scale, impact, speed, and musicality.
As audiophiles and industry critics prepare for hands-on evaluations, the introduction of the No. 35 and No. 36 marks a significant milestone in the evolution of ultra-high-end two-channel and multichannel home theater systems.
Main Facts
The announcement of the REL No. 35 and No. 36 brings sweeping updates to the brand’s elite Reference tier, bridging the gap between raw, unrestrained power and the delicate nuance required for world-class music reproduction.
- Model Lineup & Pricing: The REL No. 35 is available at an MSRP of $10,000 USD, while the larger REL No. 36 commands $12,000 USD. Both models are available immediately through REL’s global network of authorized Reference dealers.
- Driver Evolution: Both subwoofers feature newly developed, next-generation Pure Carbon Fibre drivers designed specifically to handle the immense output of upgraded Class AB/D hybrid amplification platforms.
- The No. 36 Flagship Architecture: Retaining its legendary 15-inch driver format, the No. 36 transitions to a finer, higher-density 12k carbon fiber weave. This is paired with a heavily reinforced cone structure and a completely revised mechanical suspension system, yielding vastly superior linear travel (excursion) and absolute driver control.
- The No. 35 Performance Leap: The No. 35 receives an equally rigorous overhaul. It boasts an additional 12mm of linear travel in each direction compared to its predecessor, translating to a dramatic increase in physical scale, dynamic impact, and headroom without sacrificing transient speed.
- Availability: Units are shipping to dealers worldwide, backed by exclusive side-by-side comparative demonstrations hosted at REL’s corporate and R&D facilities.
Chronology of Innovation: The Path to the No. 35 and No. 36
To understand the magnitude of the No. 35 and No. 36 releases, one must examine the rigorous timeline of REL Acoustics’ design philosophy over the past decade.
The Legacy of the Reference Series (2020–2022)
When REL introduced the No.31 and No.32 subwoofers four years ago, they were widely heralded as a triumph of industrial design and acoustic transparency. For decades, subwoofers in ultra-high-end audio were often dismissed by purists as blunt instruments—great for cinematic explosions, but detrimental to the subtle, harmonic decay of an acoustic double bass or a concert grand piano. REL’s Reference line shattered that stigma by integrating lightning-fast transient response with cabinet architectures that effectively eliminated internal standing waves and cabinet resonance.
The R&D Phase (2023–2025)
Despite the commercial and critical success of the No.31 and No.32, REL’s engineering team—led by principal designer John Hunter—did not rest on their laurels. Over a multi-year development cycle, the R&D department focused on a singular bottleneck: driver behavior under extreme thermal and mechanical stress.
As amplifiers became more efficient and powerful, existing cone materials occasionally faced limitations when pushed to absolute reference levels. The team experimented with various carbon fiber weaves, resin matrices, and surround geometries. Through thousands of hours of destructive and non-destructive testing, REL mapped out the exact failure points of traditional cones, leading directly to the creation of the 12k carbon fiber weave utilized in the new generation.
The 2026 Global Launch
By mid-2026, prototypes of the No. 35 and No. 36 had cleared final listening panels. Eschewing purely objective measurements in favor of emotional resonance, the final voicing sessions ensured that the subwoofers could seamlessly blend with the world’s most esoteric electrostatic, planar, and dynamic loudspeaker systems. The official unveiling in September 2026 marks the culmination of this exhaustive journey.
Supporting Data & Technical Deep Dive
The devil in high-end audio is always in the details. A closer look at the engineering specifications of the REL No. 35 and No. 36 reveals a series of sophisticated mechanical and electrical upgrades.
1. Advanced Pure Carbon Fibre Driver Technology
Carbon fiber is prized for its high stiffness-to-weight ratio, making it an ideal cone material for subwoofers that must start and stop on a dime. However, not all carbon fiber is created equal.
- The 12k Weave (No. 36): The flagship No. 36 utilizes a 12k tow carbon fiber weave. This finer weave structure distributes mechanical stress more evenly across the entire surface area of the massive 15-inch cone. The result is a stiffer piston-like motion that drastically reduces high-frequency break-up modes and distortion at high volume.
- Reinforced Cone Structures: Both the No. 35 and No. 36 feature internal ribbing and optimized resin layering, ensuring that the cone does not flex or deform under the immense hydraulic pressures generated inside the cabinet during heavy low-frequency passages.
2. Expanded Suspension and Linear Travel (Xmax)
To move large volumes of air without distortion, a driver must possess extreme linear excursion capabilities.
- The No. 35 introduces an engineering breakthrough for its footprint, gaining an extra 12mm of travel in each direction (totaling 24mm of peak-to-peak linear excursion). This expanded envelope allows the smaller cabinet footprint of the No. 35 to punch far above its weight class, delivering the acoustic pressure levels typically associated with much larger enclosures.
- The No. 36 features a completely re-engineered natural rubber and Nomex spider suspension assembly. This allows the 15-inch driver to maintain absolute centering and magnetic linearity even when driven to the edge of its operational limits by the internal amplifier.
3. Amplification and Power Delivery
While REL has historically kept exact wattage figures proprietary, the company notes that the Class AB/D hybrid amplifier platforms inside the No. 35 and No. 36 have been updated to match the heightened thermal and electrical demands of the new drivers.
- Class AB Front-End: Retained for its superior harmonic micro-detail, the input and driver stages ensure that the subtle textural cues of low-frequency instruments are preserved.
- Class D Output Section: Provides massive, instantaneous current delivery capable of driving low impedances down to earth-shaking sub-audible frequencies without thermal throttling.
Official Responses and Perspectives
The audio community has reacted with immense enthusiasm to the arrival of REL’s latest flagships. Industry insiders and company executives have shared insight into the philosophy driving the brand forward.
John Hunter on the Philosophy of Sound
In statements accompanying the launch, REL principal John Hunter encapsulated the ethos that guides the company’s engineering department:
"We don’t stop when the measurements are perfect, we stop when the music is."
Expanding on this during press briefings, Hunter emphasized that human perception of bass goes far beyond flat frequency response graphs in an anechoic chamber.
"You can engineer a driver that measures perfectly flat on a 2-meter ground plane, but if it fails to convey the emotional weight, the air, and the decaying resonance of a live performance, it’s a failure. With the No. 35 and No. 36, our goal was to eliminate the mechanical signature of the subwoofer entirely. When you listen to these units, you shouldn’t hear a box in the corner of the room; you should simply experience a deeper, more expansive musical reality."
Dealer and Distributor Reactions
Early reactions from elite specialty audio dealers who received preview briefings have been overwhelmingly positive. Many have noted that the integration speed—long considered REL’s primary competitive advantage via their high-level connection methodology—has reached an unprecedented level of transparency.
"When upgrading from a legacy reference model to the new No. 36, the most striking attribute isn’t just that it plays louder or deeper," noted one senior North American REL Reference dealer. "It’s the uncanny sense of space it projects into the room. The soundstage of the main speakers opens up because the sub-bass foundation is so utterly devoid of smearing."
Market Implications and Future Outlook
The launch of the REL No. 35 ($10,000) and No. 36 ($12,000) arrives at a fascinating juncture for the high-end audio market. As ultra-luxury two-channel systems continue to push the boundaries of resolution, the demand for sub-bass integration that does not compromise midrange clarity or transient speed has never been higher.
1. Raising the Bar for Ultra-High-End Sub-Bass
Historically, multi-subwoofer arrays and flagship sub-bass systems were treated as optional aftermarket additions for home theaters. REL has spent the last two decades successfully shifting this paradigm, proving that reference-grade subwoofers are essential components in cost-no-object two-channel stereo systems. The No. 35 and No. 36 solidify this market category, demonstrating that passive and active loudspeaker systems costing upwards of $100,000+ can derive tangible sonic benefits from dedicated low-frequency support.
2. Competitive Landscape
At the $10,000 to $12,000 price point, the No. 35 and No. 36 occupy rarefied air. Competitors in this tier—ranging from custom horn-loaded sub-bass solutions to high-output DSP-heavy digital subwoofers—will find it increasingly difficult to match REL’s unique combination of high-level analog connection philosophy, proprietary driver material science, and aesthetic integration.
3. The Consumer Experience
For prospective buyers, REL has ensured that experiencing the new technology is a transparent process. With side-by-side comparative demonstrations rolling out at authorized Reference dealerships globally, clients are being given the rare opportunity to hear the direct generational leap between the previous tier and the new carbon-fiber-driven flagships.
As these units begin shipping to homes, studios, and listening rooms worldwide, the REL No. 35 and No. 36 are poised to establish a new gold standard for what is sonically possible in the realm of reproduced low frequencies.
