Canton Reference Sub black lacquer

A subwoofer that goes down to 18 Hz without software trickery is rare. The Reference Sub is the first subwoofer in Canton’s 2023 Reference range, a line completely renewed after the replacement of the 2015 K generation. Manufactured in Weilrod, Germany, at the brand’s historic headquarters, it shares the same materials and design philosophy as the speakers in the series: curved forms, a BCT (Black Ceramic Tungsten) cone, and a plinth integrating the Bass-Guide system.

Front-firing and passive radiator: an effective combination

The Reference Sub uses an uncommon hybrid configuration. The main 308 mm driver, front-firing, works in tandem with a passive radiator of identical size, positioned underneath the cabinet (downfire). This layout combines the advantages of two approaches: the direct energy of a front-firing woofer and the low-frequency extension provided by a large-diameter passive radiator, without the turbulence of a conventional bass-reflex port.

The cabinet’s generous internal volume (53 cm deep) gives the system the space it needs to operate in the very lowest frequencies. Canton claims a response down to 18 Hz, a figure the built-in DSP processing helps to achieve with precision.

BCT cone: transformed aluminum

BCT (Black Ceramic Tungsten) technology is the result of a transformation process in which 25% of the molecular structure of an aluminum cone is converted into ceramic, then enriched with tungsten particles and other metals. The result is a cone that is black on both sides, retaining the lightness of aluminum while gaining rigidity.

On a subwoofer, this increased rigidity translates into better control of cone movement during large excursions. Transients remain crisp, and bass retains its definition even at high volume. The Wave Surround (multi-curvature surround) surrounding the driver allows for long excursions while keeping the cone perfectly aligned.

500 watts and DSP in the service of precision

The integrated digital amplifier delivers 500 W continuous power (750 W peak). This power drives the BCT woofer via DSP processing that performs several functions: response curve equalization, overload protection (Canton SC technology), and room acoustic compensation (Room Compensation).

The Room Compensation function offers three positions. This setting adjusts the subwoofer’s behavior according to its placement: near a wall, in a corner, or in free space in the room. The Wide, Normal, and Narrow modes modify the deep-bass response to avoid the build-up of low frequencies that can occur with certain placements.

The rear controls include a volume control, phase adjustment, and a variable crossover frequency between 55 Hz and 200 Hz. High-level (speaker terminals) and low-level (RCA) inputs ensure compatibility with all types of amplifiers and processors.

The Bass-Guide system integrated into the plinth

The plinth of the Reference Sub uses the Bass-Guide principle developed for the floorstanding speakers in the Reference series. This floating base, mechanically decoupled from the floor by CNC-machined feet with PVD treatment, channels and distributes low frequencies evenly throughout the room.

Bass-Guide reduces the influence of placement on low-frequency response. A subwoofer placed in a corner or against a wall usually exhibits a strong reinforcement of the lowest frequencies, sometimes at the expense of articulation. This waveguide system mitigates these variations and offers valuable flexibility during installation.

Cabinet construction: simulated bracing, curved forms

The Reference Sub’s cabinet is built from thick, multi-layer panels. The internal bracing has been sized using computer simulations to target the resonance modes specific to this volume and geometry. The panels adopt gentle curves that break away from the boxy shapes of conventional subwoofers.

This design without sharp edges limits internal reflections and helps damp standing waves inside the cabinet. The total weight of 37 kg reflects the density of the construction. The acoustically neutral fabric grille attaches magnetically, with no visible screws.

Two finishes are available: high-gloss black lacquer (twelve coats of varnish, sanded and polished) or satin matte white. Its dimensions (49 × 59 × 53 cm) require a fair amount of space, but the rounded forms visually soften the subwoofer’s presence in the room.

Integration with the Reference series and other systems

The Reference Sub has been designed to complement the speakers in the 2023 Reference series (Reference 1 to 9, Reference Center), but it works with any stereo or home cinema system. The crossover frequency range (55–200 Hz) and multiple inputs allow it to adapt to speakers with varying characteristics.

For multichannel setups, the presence of a filtered output makes it easier to connect a second subwoofer. Auto power-on (signal detection) simplifies everyday use.

Technical specifications

Configuration

• Type: active bass-reflex subwoofer with passive radiator

Drivers

• Woofer: 308 mm BCT (Black Ceramic Tungsten) woofer
• Passive radiator: 308 mm

Amplification

• Rated power: 500 W
• Peak power: 750 W
• Type: high-power integrated digital amplifier, optimized for precise driver control and high dynamic performance

Acoustic performance

• Frequency response: 18 Hz – 200 Hz
• Crossover frequency: 55 Hz – 200 Hz (adjustable)

Technologies

• BCT (Black Ceramic Tungsten) diaphragm: optimal stiffness-to-weight ratio for precise, fast, and distortion-free bass reproduction
• Bass-Guide system: optimized distribution of low frequencies for greater flexibility in room placement

Cabinet design

• High-rigidity multilayer structure
• Internal bracing optimized using computer simulation
• Curved shape promoting even dispersion of low frequencies
• Effective reduction of unwanted resonances

Base and isolation

• Isolating base with floating design
• CNC-machined feet with PVD coating for maximum stability and optimal mechanical isolation

Accessories

• Protective grille: acoustically neutral fabric cover with invisible magnetic mounting

Dimensions and weight

• Height (with base): 59 cm
• Width: 49 cm
• Depth: 53 cm
• Weight: 37 kg