I have always loved a story about Rolls-Royce. For decades, the company refused to publish a horsepower figure. In the place where a number should have appeared, there was a single word: adequate. It was not modesty. It was confidence, the assurance that the power was there whenever the driver asked for it, delivered without drama and without needing to announce itself.
That story says a great deal about what we set out to achieve with Reference No.36. Its 1,000-watt RMS Class AB/D amplifier, 15-inch Pure Carbon Fibre driver, and extension to -6 dB at 15 Hz in-room are formidable specifications. But none of them explains why we built it. Our purpose was not to make bass the center of attention. It was to give the entire system greater scale, freedom, and emotional authority, then allow No.36 to disappear into the performance.
Contents:
- Wattage Output
- Impulse Control
- Cabinet Design
- Frequencies & Connectivity
- Single, Stereo Pair, or Line Array?
- The Highest Expression of Reference
The confidence to say adequate
A wattage figure describes output at a moment in time. It does not describe how calmly an amplifier supplies current through a demanding passage, how firmly it controls a large driver, or how much reserve remains when the music moves from a whisper to full orchestral weight. I return to current again because current determines whether power feels effortless or merely impressive.
During development testing, our new No.36 amplifier sustained its rated 1,000 watts for approximately 16 continuous minutes. The previous design could maintain comparable output for less than a minute under the same kind of fixed-load test. Music makes very different demands from a continuous fixed-load test. The test shows how long the amplifier can sustain full output under that load. In listening, those reserves become composure: a drum strike arrives with physical certainty, a pipe organ settles into the room without strain, and the system retains its character when the scale of the performance suddenly expands.
I did not want power for spectacle. I wanted power held in reserve, available instantly and controlled completely. No.36 can move an extraordinary volume of air, but to me its greater achievement is the ease with which it moves between almost imperceptible information and full dynamic impact.
Music is a sequence of impulses
When I explain why Reference remains front-firing, I often begin with a concert hall rather than a laboratory. Even a sustained violin or cello note is created through a succession of carefully controlled movements. A plucked string, the leading edge of a piano note, the pressure of a kick drum, and the start of a voice in a reverberant space are all impulses. Their timing tells us where the event occurred, how large it was, and how the room responded.
Reference No.36
We point No.36's 15-inch Pure Carbon Fibre driver toward the listener because impulse behavior is fundamental to musical realism. Pure carbon fibre provides the stiffness required to remain controlled while keeping moving mass low enough to respond quickly. The closed-box architecture avoids the overhang that can blur pitch and timing, while the amplifier supplies the current needed to start and stop the driver with authority. The result is the scale we expect from a 15-inch Reference design without sacrificing speed, texture, or nuance.
This is why I believe a Reference subwoofer can transform qualities that do not initially seem like bass. When timing is correct, the midrange becomes more open, voices occupy more convincing space, and the boundaries of the recording venue become easier to perceive. I do not want you to hear a larger subwoofer. I want you to hear a more complete performance.
The cabinet is part of the instrument
I have called the cabinet one of the largest contributors to Reference performance. That conviction explains why we did not abandon a form refined over generations simply to make No.36 appear new. Its continuous curves recall the sterns of classic Gar Wood and Chris-Craft runabouts, where structure, craft, and beauty are inseparable. The same idea guides No.36: the cabinet looks resolved because it is resolved.
Inside, we use an elaborate bracing system to tie the enclosure together like the structural ribs of a wooden hull. A massive, contoured rear backing plate follows the exterior curve, supporting the driver and amplifier within an exceptionally rigid structure. That rigidity prevents energy from being stored and released by the cabinet, allowing the smallest improvements in driver control and amplifier response to remain audible. Twelve coats of hand-rubbed lacquer create the final depth of finish, but I do not think of the luxury as surface decoration. It is the visible expression of the structure beneath it.
No.36 Line Array
We also preserved the dimensions of earlier 15-inch Reference models. This is more than visual continuity. It allows longtime owners to introduce No.36 into Reference Line Arrays incorporating No.32 or No.25, extending an established system rather than abandoning it. To me, that is part of responsible design: when something has been made well, the next generation should honor the investment that came before.
Fifteen hertz is not the point
No.36 reaches to -6 dB at 15 Hz. It is an extraordinary figure, but I do not think the number is the point. The lowest frequencies are rarely experienced as a discrete note. We feel them as the pressure of a large room, the atmosphere surrounding an orchestra, the scale of a cinematic event, and the quiet energy that makes a recording space seem physically present. Remove that foundation and the performance becomes smaller. Restore it correctly and the entire presentation becomes more believable.
That is why I believe extension must arrive with control. We gave No.36 Dual Parametric EQ to address the room without rewriting the character of the system. Two carefully targeted bands allow an installer to reduce dominant resonances across the 23 to 90 Hz range, with up to plus or minus 4 dB of adjustment. Our goal is not to process the life out of the signal. It is to remove the room's strongest impositions so the speed, pitch, and natural weight of the recording can emerge.
We designed the Reference Remote to place High Level or Low-Level gain, crossover, .1/LFE gain, phase, and Dual Parametric EQ at the listening position, where every decision can be judged by ear. High Level Connection allows No.36 to receive the same signal and timing character as the main loudspeakers, while dedicated low-level and LFE connections support theater and advanced installations. AirShip Direct adds wireless flexibility without changing our central objective: integration must serve the music.
One No.36 or an entire architecture
I have heard a single No.36 establish the foundation of an exceptional system when it is correctly matched to the room and loudspeakers. A stereo pair can improve symmetry, spatial consistency, and headroom while allowing each unit to work with greater ease.
No.36 Stereo Pair
At the highest level, a Reference Line Array distributes low-frequency energy vertically through the room, creating a wave launch of extraordinary scale and effortlessness.
No.36 Line Array
I have never regarded a Line Array as simply a way to create more output. Properly installed, it can free the main loudspeakers, open the soundstage, preserve clarity through the largest dynamic events, and make the system feel less constrained at every level. We developed new adjustable leveling feet so each No.36 can be raised or lowered with precision, making it possible to level the cabinet or introduce a subtle upward tilt for improved clarity. In an array, a supplied tool allows the rake of the complete stack to be refined without dismantling it, a small mechanical detail with a direct effect on installation precision and listening clarity.
The highest expression of Reference
We built No.36 for the world's most ambitious two-channel systems, reference-level theaters, and rooms that require exceptional scale and control. Yet I believe its character is defined as much by restraint as by power. It can reproduce the physical force of the largest event, but it can also reveal the decay of a note, the air around a voice, and the dimensions of a space before the music begins.
I describe Reference as a living document. With each generation, we preserve what listening has proven and change only what can make the experience more believable. No.36 is the clearest expression of that philosophy today: immense capability, disciplined engineering, enduring craftsmanship, and power that never needs to become the story. The story is the performance and how completely it draws you in.
Reference No.36
An authorized REL Reference dealer can evaluate your room, loudspeakers, electronics, and listening ambitions to determine whether the right system begins with one No.36, a stereo pair, or a Reference Line Array. Because at this level, I do not believe choosing a subwoofer is about adding more bass. It is about building a better system.
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