Triangle Thetis 300 light oak

Name: Thetis 300 light oak
Brand: Triangle
Price: 549.0 EUR
Availability: BackOrder
Rating: 4.0 (1 reviews)

(1 customer review)

Finish : Light Oak

Overview

The Triangle Thetis 300 is an active subwoofer in a compact format, equipped with a 20 cm composite diaphragm driver and 150-watt class D amplification. Its bass-reflex enclosure, featuring a laminar port, is designed to limit air turbulence while blending visually into a living space.

Front view, slightly angled, of a tall floorstanding speaker in light wood veneer on a black base, front panel featuring five circular openings including a small speaker, one white cone, and three black cones, accompanied on the left by a matching cubic subwoofer.

Acoustic Architecture and Technical Innovations

At the heart of the Thetis 300 is a 20-centimeter downward-firing driver, a configuration that optimizes bass frequency dispersion in all directions. This composite diaphragm, combining cellulose and carbon fibers, offers exceptional rigidity while maintaining the crucial lightness needed for responsiveness. The engineers paired this driver with an oversized motor and controlled suspensions, enabling remarkable power handling without audible distortion.

The 150-watt RMS (250-watt peak) class D amplification powers this driver with optimal energy efficiency. This modern amplification technology ensures minimal heat generation while delivering instant power capable of reproducing the most demanding dynamics, from cinematic explosions to jazz double bass attacks.

The Thetis 300’s bass-reflex design deserves special mention. The laminar port, unlike traditional tubular ports, drastically reduces unwanted noise caused by air turbulence. This design allows the subwoofer to fully exploit the Helmholtz resonator principle: at the tuning frequency, the port accumulates and releases energy with a calculated time delay, significantly extending the bass response down to 32 Hz while maintaining a compact enclosure volume.

Front view of a light wood cabinet with a large central black speaker surrounded by a rubber ring, four black circular feet at the corners, and gold terminals visible on the right edge

Versatile Connectivity and System Integration

The Thetis 300’s connectivity reflects a rare commitment to universality. The unfiltered LFE input allows direct integration into home theater setups, leaving crossover management to the AV processor. Standard stereo RCA inputs accommodate line signals from traditional hi-fi systems.

More uniquely, the high-level inputs let you connect the subwoofer directly to the speaker outputs of amplifiers without a dedicated subwoofer output. This feature opens the Thetis 300 to vintage systems or entry-level integrated amplifiers, making deep bass accessible to a wider audience.

Rear-panel controls for volume, crossover frequency, and phase allow precise matching with your main speakers. The ability to adjust phase is especially useful for optimizing acoustic coupling, whether the subwoofer is placed in front of or behind the listening position.

Modern Ergonomics and Home Integration

The front LED display instantly shows the volume level, making adjustments easy during initial setup or when changing sources. The included infrared remote control allows you to adjust the volume and put the unit into standby from a distance, making daily use seamless.

The automatic power-on function detects the presence of a signal and activates the subwoofer without manual intervention. After 20 minutes of silence, standby mode engages automatically, reducing power consumption to a minimum. This smart feature allows you to place the Thetis 300 in a discreet or even inaccessible spot without sacrificing convenience.

Its compact dimensions (30 x 34 x 30 cm) and moderate weight (10.6 kg) make it easy to fit into tight spaces. The light oak finish adds a touch of natural warmth that complements contemporary interiors, while the signature silver band of the Thetis subwoofers visually lightens the overall look.

Technical Specifications

Amplification

Power: 150 W RMS, 250 W peak
Type: Class D

Speaker

Configuration: 1 x 20 cm woofer
Cone: cellulose and carbon fiber composite
Orientation: downward-firing
Enclosure: bass-reflex with anti-noise laminar port

Connectivity and Controls

Unfiltered LFE input
Stereo RCA line input
High-level input for amplifiers without subwoofer output
Available controls: volume, crossover frequency, phase

Features

Automatic power-on
Automatic standby after 20 minutes without signal
Infrared remote control included
Front LED volume display

Dimensions and Weight

Dimensions: 30 x 34 x 30 cm
Packaged dimensions: 39 x 42.2 x 39 cm
Net weight: 10.6 kg
Weight with packaging: 12.1 kg
Finish: light oak

Accessories and Usage

Included accessories: power cable, infrared remote control, user manual
Recommended applications: addition to 5.1 / 7.1 home theater setups, bass reinforcement for compact hi-fi systems
Suggested use: small to medium-sized rooms, pairing with bookshelf or satellite speakers

Frequently Asked Questions

How far from the wall can I place the Thetis 300?

Contrary to popular belief, a subwoofer with a rear port can be placed relatively close to a wall. As long as the distance between the back of the subwoofer and the wall exceeds the diameter of the port, performance remains optimal. In practice, 15 to 20 centimeters is usually enough to preserve the efficiency of the bass-reflex system.

What’s the difference compared to the higher-end Thetis 340 model?

The Thetis 340 features a 25 cm driver and 250-watt RMS amplification, offering greater extension and power. The 300 is ideal for small to medium-sized rooms (up to 30 m²), while the 340 is suited for larger spaces or users seeking higher sound levels.

How do I set the crossover frequency?

The setting depends on your main speakers. For compact bookshelf speakers, a crossover between 80 and 100 Hz generally works well. With floorstanders, go down to 50–60 Hz. The best approach is to experiment by listening to different tracks to find the point where the transition becomes seamless.

Can the subwoofer work with my old stereo amp?

Absolutely. The high-level inputs let you connect the Thetis 300 to the speaker terminals of any amplifier. The signal is then filtered internally to keep only the low frequencies. This solution preserves the signal sent to your main speakers while adding bass extension.

Can the automatic standby mode cause issues?

The detection circuit is sensitive enough to activate as soon as the first audio signals are present. The wake-up delay is imperceptible in normal use. If you prefer to disable this function, simply switch the AUTO selector to the OFF position.