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REFERENCE SERIES

No.35

$10,000

Extraordinary Power. Reference Control.

No.35 establishes a new benchmark for 12-inch Reference performance, combining extraordinary power and scale with the speed, precision, and refinement that define REL Reference. Its new amplifier and driver architecture deliver levels of performance previously beyond any single 12-inch REL.

900-watt Class AB/D Amplifier
12" (305mm) Pure Carbon Fibre Driver
Dual Parametric EQ for Precise Room Tuning
Expanded depth and scale through Line Array compatibility

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Delivering More Than Sound

3 Year warranty

Lifetime Customer Support

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No.35

Single Subwoofer

$10,000

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Beyond Expectations

Reference Performance, Redefined

No.35 establishes a new standard for what a single 12-inch Reference subwoofer can achieve. Its new 900-watt Class AB/D amplifier combines the immense current reserves of a traditional Class A/B design with the speed and efficiency of a Class D output stage. Paired with an extensively redesigned 12-inch Pure Carbon Fibre driver, the result is effortless, fast, and remarkably controlled bass at levels previously beyond any single 12-inch REL.

Indeed, No.35 plays louder than our previous-generation 15-inch Reference flagship, while delivering the speed, nuance, and refinement expected of REL Reference. The result is not simply greater output. Music gains natural weight and dimension, dynamics feel unrestrained, and the entire system performs with greater ease.

No.35 is Reference without compromise, delivering an extraordinary balance of scale, precision, and authority from a 12-inch architecture.

Reference Performance, RedefinedNo.35 establishes a new standard for what a single 12-inch Reference subwoofer can achieve. Its new 900-watt Class AB/D amplifier combines the immense current reserves of a traditional Class A/B design with the speed and efficiency of a Class D output stage. Paired with an extensively redesigned 12-inch Pure Carbon Fibre driver, the result is effortless, fast, and remarkably controlled bass at levels previously beyond any single 12-inch REL. Indeed, No.35 plays louder than our previous-generation 15-inch Reference flagship, while delivering the speed, nuance, and refinement expected of REL Reference. The result is not simply g...
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Design

Reference, Perfectly Proportioned

No.35 delivers the same extraordinary cabinet quality as No.36, expressed in the more compact proportions that have long defined REL’s 12-inch Reference models. Its curvilinear form is unique within the REL range, with sweeping surfaces inspired by classic wooden runabouts and a top that tumbles gracefully into the rear corners. Achieving these continuous curves requires exceptional woodworking, finished in 12 coats of hand-rubbed lacquer.

The details are equally considered. A sculpted string grille follows the cabinet’s curves, carbon fibre provides a visual connection to the engineering within, and triple-plated stainless-steel handles anchor into thick plates of milled aluminum. Inside, elaborate bracing reminiscent of a ship’s structural ribs creates an exceptionally rigid foundation.

No.35 retains the exact dimensions of No.31 while occupying approximately 20 percent less space than No.36. Precision-knurled cylinders beneath the front rails provide exact leveling, particularly important for Reference Line Arrays, where existing No.31 models can be incorporated with No.35. It is full Reference craftsmanship, presence, and substance, distilled into beautifully balanced proportions.

Driver

Driven to Be Perfect

No.35’s 12” (305mm) Pure Carbon Fibre driver was comprehensively re-engineered. The vastly greater output made possible by its new Class AB/D amplifier placed demands on the driver that no previous 12” REL had faced, requiring virtually every major component to be reconsidered.

A new cast-aluminum frame allows substantially greater movement, while a stiffer yet more supple spider maintains precise concentricity even at maximum output. A redesigned surround provides the control required at the front of the cone. Together, these changes deliver an additional 12mm of travel in each direction.

But greater output was only part of the goal. The carbon fibre cone itself advances to a finer 12K weave, bundling 12,000 micro-strands into each fibre for greater strength and improved self-damping. The result is extraordinary scale and impact combined with greater control, detail, and nuance.

Amplifier

When Tradition Meets the Future

No.35’s new 900-watt Class AB/D amplifier combines the immense current delivery and effortless authority of a traditional Class A/B monoblock with the speed, resolution, and efficiency of a Class D output stage.

At its heart is a massive 17-pound toroidal transformer, providing the current reserves needed to control No.35’s newly re-engineered 12-inch driver even at extreme output. The Class D output stage delivers that power with exceptional speed and efficiency, without the heat and power consumption of a conventional amplifier of this scale.

The result is 900 watts of effortless power, combining the weight and authority of a great Class A/B monoblock with the speed, control, and attack of the finest Class D designs.

Line array

Legendary. Iconic. REL Reference Line Arrays.

For more than two decades, Reference Line Arrays have represented the ultimate expression of our approach to deep bass. No.35 advances that tradition with its new high-current Class AB/D amplifier, comprehensively re-engineered 12-inch driver, and precisely adjustable cabinet, delivering greater drive, deeper extension, and more than 3 dB of additional output per unit.

But a Reference Line Array is about far more than output. By vertically distributing multiple subwoofers through the height of the room, the array energizes the space in a fundamentally different way, allowing the main loudspeakers to perform with greater freedom and scale. The transformation extends beyond bass: the soundstage opens, dynamics become more effortless, and midrange and high-frequency performance gain clarity and dimensionality.

Because No.35 retains the exact dimensions of No.31, it can anchor existing Line Arrays incorporating earlier No.31 models, providing a natural upgrade path for longtime Reference owners. With No.35, Reference Line Arrays achieve a new level of scale, precision, and authority.

Wireless

Wireless Needn’t Be a Compromise

With AirShip Direct, There Is None.

Optional AirShip Direct delivers REL’s renowned High Level Input and .1/LFE signals wirelessly, with zero digital compression and no compromise in sound quality. High Level and .1/LFE can be used simultaneously, allowing No.35 to deliver seamless integration for music and the full impact of film soundtracks without long cable runs.

Discrete Texas Instruments ADC and DAC chipsets are carefully selected and validated through extensive listening to preserve nuance, dynamics, and transparency. Designed to plug directly into the rear panel, AirShip Direct keeps installation clean and virtually invisible while preserving the natural character expected from REL Reference.

Remote

Take Control of Your World

The REL Reference Remote is designed with the same attention to detail as No.35 itself. Its sculpted form sits naturally in the hand, while its substantial weight and beautifully finished controls convey the quality and permanence expected of a Reference product.

More importantly, it places every critical setup control exactly where it belongs: in the listening chair. High Level or Low Level gain, crossover, .1/LFE gain, phase, and Dual Parametric EQ can all be adjusted while listening to the system. Once setup is complete, the remote can be switched off to lock the settings and prevent accidental changes.

Dual Parametric EQ provides precise control at both ends of the bass range, allowing deep room resonances to be corrected while upper-bass excess can be gently trimmed. The result is deeper, cleaner bass and seamless integration with the main loudspeakers, all without leaving your seat.

Specifications

Technical Specifications

Type

Closed box, front-firing driver

Active Driver Size & Material

12 in. (305mm) long throw, carbon fibre cone with inverted carbon fibre centre cap, die cast alloy chassis

Passive Radiator Size & Material

N/A

Low Frequency Extension

-6dB at 17Hz in Room

Input Connectors

High Level Neutrik SpeakOn, Low Level stereo RCA and XLR, LFE RCA, LFE XLR

Output Connectors

High Level Neutrik SpeakOn, LFE RCA, LFE XLR, Line XLR, Line RCA Gain Control Range: 80 dB

Power Output

900 watts (RMS) Ultra High-Current Power Supply

Amplifier Type

Class AB/D

Wireless Capability

REL AirShip Direct (sold separately)

Dual Parametric Filter

Yes

Finish

Piano Black Lacquer, 12 coats

Protection System

Fully Electronic Set Safe

Yes

D.C. Fault

Yes

Output Short

Yes

Mains Input Voltage

220-240 volts, 110-120 volts for certain markets

Fuses

8 Amp semi delay 230 volts operation 15 Amp semi delay 115 volts operation

Supplied Accessories

Mains Lead

Yes

Neutrik Speakon

10 Meters (32’10”) Nominal: Yes

Interconnect

User Manual

Yes

In the interest of product development, REL Acoustics Limited reserve the right to vary these specifications without notice.

Dimensions

DIMS

W x H x D
25.12 x 17 x 28.5 in.
(638 x 435 x 724 mm)

Shipping DIMS
W x H x D
37 x 27 x 35 in
(933 x 681 x 870 mm)

Net Weight

130 lbs. (59 kg). Shipping weight: 172.5 lbs (78.25 kg)

Faq

How is the No.35 driver different from the No.31?

Virtually every major component was re-engineered. The Pure Carbon Fibre cone advances from No.31's 6K construction to a finer 12K weave, using bundles of 12,000 carbon filaments. The tighter weave creates a quieter, more self-damped cone. The cast-aluminum frame, magnet system, spider, surround, and supporting driver architecture were also upgraded to permit greater travel while maintaining precise, piston-like control. Together, these changes allow No.35 to handle the substantially greater reserves of its new amplifier while revealing greater dynamic contrast, detail, and nuance.

What is different about the new Class AB/D amplifier?

The new Reference amplifier combines a massive traditional Class A/B power supply with a modern Class D output stage. The power supply provides enormous current reserves, while the Class D output stage preserves speed and efficiency without the heat and power consumption of a conventional amplifier of this scale. The result is the effortless authority, control, and dynamic freedom expected of REL Reference.

Why does amplifier headroom matter?

REL amplifiers are deliberately designed with substantial reserves beyond what is required for normal operation. Rather than chasing the highest possible published wattage figure, the goal is to preserve headroom for the sudden peaks that give music and film their scale and impact. No.35 can therefore deliver enormous bursts of energy while maintaining control, producing a presentation that feels powerful, relaxed, and unstrained.

What improves beyond simply playing louder?

No.35 delivers greater output than its predecessor, but output alone does not describe the improvement. Its new amplifier and driver produce greater drive and extension with a stronger sense of ease. Extreme low bass below 25 Hz is reproduced with greater amplitude and less apparent effort, while the quieter 12K cone contributes to greater dynamic contrast, detail, and nuance.

What does Dual Parametric EQ do?

Dual Parametric EQ provides precise control across the bass range. One band can be used to correct a deep room resonance, while the second can gently trim excess energy in the upper bass. This allows No.35 to integrate more naturally with the room and main loudspeakers while preserving the speed and character of the system.

Can No.35 be used for both music and home theater?

Yes. No.35 can use REL's High Level Connection for two-channel listening and the .1/LFE input for film soundtracks. Both connections can remain active, allowing No.35 to preserve the tonal character and timing of the main loudspeakers for music while delivering the full impact of the dedicated LFE channel for home theater.

Can No.35 be used wirelessly?

Yes. Optional AirShip Direct transmits REL's High Level and .1/LFE signals wirelessly with zero digital compression. High Level and .1/LFE can be used simultaneously, preserving the speed, dynamics, and natural character expected of REL Reference without the need for long cable runs.

Can No.35 be used with No.31 in a Reference Line Array?

Yes. No.35 retains the exact dimensions of No.31 and can anchor an existing Reference Line Array incorporating earlier No.31 models. This provides a natural upgrade path for existing Reference owners while preserving the value and performance of the products they already own.