Canton AR 4 S2 white (pack of 2)

Add a vertical dimension to an existing home theater system without redoing the entire setup: that’s the promise of Dolby Atmos “Enabled” speakers, designed to reflect sound off the ceiling. Canton has been offering its AR 4 module for several years, and the S2 version incorporates the technical developments of the new GLE S2 series launched in 2025. Sealed enclosure, redesigned drivers, and versatility that goes beyond the simple role of a height speaker.

An ATB cone woofer-midrange driver

The acoustic heart of the AR 4 S2 is a 154 mm driver equipped with an aluminum-titanium cone featuring a black finish, which Canton refers to as ATB (Aluminium Titan Black). This treatment, already present on the German manufacturer’s higher-end series, aims to combine lightness and rigidity. The cone can therefore move quickly without deformation, which favors crisper transient reproduction and better-defined midrange.

For Dolby Atmos, this midrange precision is crucial. The sound reflected by the ceiling travels a longer path than direct sound: any inaccuracy or excessive coloration is amplified by this bounce. A driver capable of reproducing clean impulses contributes to a more believable vertical localization of sound effects.

Aluminum tweeter and extended waveguide

The AR 4 S2 abandons the fabric tweeter of its predecessor in favor of a 25 mm aluminum dome, coupled with a redesigned waveguide. This configuration extends the frequency response up to 40,000 Hz, well beyond the human hearing threshold, but Canton believes this extra margin benefits clarity in the upper audible spectrum.

The waveguide controls treble dispersion to direct acoustic energy more evenly. On a speaker designed to operate tilted or laid flat, this control of directivity is particularly important: the sound must reach the ceiling at a precise angle for the height effect to work properly.

Sealed enclosure and design choices

Canton opted for a sealed system rather than bass-reflex (the specifications mention “bass-reflex” but the manufacturer indicates a “closed” system). The advantage of a sealed volume: more gradual bass roll-off and better low-frequency control, even if extension is limited to 50 Hz. For an Atmos module, this limitation is not a drawback since height effects rarely require deep bass.

The dimensions of 17 × 14.5 × 26 cm (width × height × depth in horizontal position) have been calculated to match the floorstanding and bookshelf speakers of the GLE range, but also other series. The weight of 3.6 kg remains moderate, making it easy to place on top of an existing speaker without risking imbalance.

Installation on a speaker or on the wall

The main function of the AR 4 S2 is to sit on top of a front or surround speaker. The manufacturer recommends pairing it with the GLE 90 S2, GLE 70 S2 or GLE 30 S2 models, but compatibility extends beyond this one series. The shape and dimensions allow integration with most speakers whose top surface is at least 17 cm wide.

Wall mounting is built into the enclosure, with no need to buy additional accessories. This option opens up other uses: the AR 4 S2 can serve as a rear effects speaker, a stereo satellite in a secondary room, or even a ceiling speaker angled toward the listening area. Its sensitivity of 89.5 dB and 4–8 ohm compatible impedance make it easy to integrate with most home theater amplifiers on the market.

Power handling and real-world use

With 60 W nominal power and 100 W musical peak, the AR 4 S2 handles the dynamic passages of Dolby Atmos soundtracks without difficulty, provided the amplifier is properly calibrated. The 3,200 Hz crossover frequency indicates that the internal filter splits the signal between the woofer-midrange and the tweeter around this point, leaving the aluminum dome to reproduce the higher frequencies.

In an Atmos configuration, most home theater amps let you define the type of height speaker and adjust the level. It is recommended to run automatic calibration (Audyssey, YPAO, Dirac or equivalent) to optimize integration with the main speakers.

Technical specifications

Acoustic principle

• 2-way, sealed system
• ATB technology
• Passive resonator principle: bass-reflex
• Dolby Atmos certification: yes

Bass / midrange driver

• Number: 1
• Diameter: 154 mm
• Material: black titanium aluminium

Tweeter

• Number: 1
• Diameter: 25 mm
• Material: black aluminium

Audio performance

• Frequency response: 50 – 40000 Hz
• Crossover frequency: 3200 Hz
• Sensitivity (2.83 V / 1 m): 89.5 dB
• Impedance: 4 – 8 Ohm
• Nominal power: 60 W
• Music power: 100 W

Dimensions and weight

• Finish: semi-gloss white
• Dimensions (W x H x D): 17 x 14.5 x 26 cm (horizontal position)
• Weight: 3.6 kg

Included in delivery

• Canton AR 4 (pair)
• Equipment feet
• Oval fabric grille
• User manual

Compatible accessories

• CantoLink 400