REL No.31 Reference Active Subwoofer – Ultimate Carbon Fibre Performance

REL No.31 – Pure Reference Bass Without Compromise

The REL No.31 represents the pinnacle of single-driver subwoofer engineering. Developed directly from REL's flagship No.32 Reference, it has been created for audiophiles and home cinema enthusiasts seeking uncompromising low-frequency performance in a more compact enclosure. Every element has been refined—from the newly developed all-carbon fibre driver to the Reference filter architecture and NextGen7 amplifier—resulting in exceptional speed, authority and transparency.

• REL Reference Series active subwoofer
• 900W RMS NextGen7 Class D amplifier
• 12" (300 mm) pure carbon fibre long-throw driver
• Sealed enclosure for maximum speed and precision
• Dual parametric room correction filters
• Reference analogue filtering
• Stackable for REL Reference Line Array systems
• Piano Black 12-layer lacquer finish

Overview

The No.31 has been designed for listeners who demand true reference performance but do not require—or cannot accommodate—the larger No.32. Rather than being a simplified version, it shares the same design philosophy and many of the same technologies, including REL's renowned Reference analogue filters and dual parametric equalisation.

Its newly developed 12-inch pure carbon fibre driver is capable of handling approximately three times the power of its predecessor while maintaining exceptional transient speed and control. Combined with the sealed cabinet architecture, the result is bass reproduction that feels effortless, articulate and perfectly integrated with the finest loudspeaker systems.

Key Benefits

• Reference-level accuracy: sealed enclosure and carbon fibre driver deliver exceptional transient response and tonal precision.
• Power with control: the 900W NextGen7 amplifier provides substantial headroom while maintaining remarkable composure.
• Advanced room optimisation: dual parametric filters enable precise low-frequency tuning to suit the listening environment.
• Exceptional integration: REL's High-Level connection preserves the tonal character and timing of your main amplifier.
• Expandable architecture: designed to operate individually or as part of REL's Reference Line Array systems.

Key Features

• 900W RMS NextGen7 Class D amplifier
• 12" (300 mm) long-throw pure carbon fibre driver
• Die-cast aluminium driver chassis
• Sealed cabinet construction
• Reference analogue filtering
• Dual fully adjustable parametric filters
• High-Level Neutrik Speakon input and output
• Stereo RCA and balanced XLR inputs
• Dedicated RCA and XLR LFE inputs
• Low-Level RCA and XLR outputs
• REL AirShip II wireless compatibility (optional)
• Stackable Reference Line Array capability

Ideal For

The REL No.31 is intended for customers assembling uncompromising reference audio systems where absolute precision, dynamic realism and natural musical integration are essential.

• Reference two-channel hi-fi systems
• High-end home cinema installations
• Medium and large dedicated listening rooms
• Reference loudspeakers from brands such as Wilson Audio, Focal, Magico, Estelon, Klipsch Heritage and other ultra-high-end designs
• Electronics from Gold Note, McIntosh, Gryphon, CH Precision, dCS, Lyngdorf and similar manufacturers
• Reference Line Array installations using multiple No.31 subwoofers

Specifications

Why We Selected This Product

At ExclusivIT, the REL No.31 occupies a unique position within the world of reference subwoofers. Rather than pursuing sheer output alone, it has been engineered to reproduce the lowest octaves with exceptional speed, tonal fidelity and dynamic realism. Its sealed enclosure, pure carbon fibre driver and sophisticated analogue filtering allow it to disappear completely within a system, leaving only a greater sense of scale, texture and authority.

We particularly value its flexibility. Whether used as a single reference subwoofer, as a stereo pair or within a stacked Reference Line Array, the No.31 offers remarkable integration with premium loudspeakers and electronics. For customers building truly uncompromising systems, it represents one of the most accomplished subwoofers available today.