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TRIANGLE THETIS 300
Active bass-reflex subwoofer with 20 cm floorstanding woofer.
150W RMS Class D amplifier (250W peak)
Frequency response: 32 Hz - 120 Hz
Multiple inputs: LFE, RCA, speaker input
Adjustable controls: volume, phase (0-180°), crossover frequency (30-120 Hz)
Remote control + front LED display
Automatic power-on after 20 min of inactivity
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Triangle THETIS 300. A Subwoofer Worthy of Your Home Cinema
The THETIS 300 subwoofer is an essential component for any home cinema or stereo audio setup.
Equipped with a 20 cm down-firing driver and a 150W amplifier, this compact subwoofer significantly extends the low-frequency bandwidth of your system. Using a bass-reflex loading design, it maintains a modest size while delivering impressive performance.
Versatile Connectivity
The Thetis subwoofers are equipped with multiple inputs, making them compatible with a wide range of amplifiers. They include an unfiltered LFE input, standard RCA inputs, and high-level speaker inputs for amps without dedicated subwoofer outputs.
You can fine-tune the integration with your main speakers using controls for volume, crossover frequency, and phase adjustment.
Each Thetis subwoofer comes with a remote control and a front-facing LED display for clear visibility of your sound settings.
Advanced Bass-Reflex Design
The THETIS 300 uses a bass-reflex loading principle, allowing it to extend low-end bandwidth while maintaining compact dimensions. It features laminar ports, which drastically reduce air flow noise compared to conventional tubular ports.
Precision Engineering
The drivers feature cones made of a composite of cellulose and carbon fiber, chosen for their extreme rigidity. Paired with oversized magnets and controlled suspensions, these components ensure excellent power handling and reproduce all types of bass impact with ease.
Driven by next-generation Class D amplifiers, the THETIS 300 delivers 150W RMS power and peaks at 250W. Its steep-slope filters allow for easier and more precise tuning with your main speakers.
The cabinet itself is the result of in-depth research into vibration behavior, giving the Thetis 300 outstanding musicality.
Proven Compatibility
The wide range of inputs ensures the THETIS subwoofers work seamlessly with nearly any amplifier:
LFE input (unfiltered) for home theater setups — all configuration is handled by your AV receiver
RCA line inputs for Hi-Fi integration
High-level speaker inputs for amplifiers without subwoofer outputs
These are complemented by manual controls for volume, crossover frequency (30–120 Hz), and two-position phase adjustment (0°–180°), ensuring optimal integration with your speakers.
Easy and Efficient Operation
For added convenience, the subwoofer includes volume control via a front rotary dial and infrared remote. A front LED display provides real-time feedback on active settings.
To save energy, auto-standby mode activates after 20 minutes of no signal and reactivates instantly when a signal returns.
Technical Specifications
Type: Bass-reflex subwoofer
Driver size: 20 cm (8")
Dimensions: 300 x 300 x 340 mm
Frequency response (+/-3 dB): 32 Hz – 120 Hz
Power: 150W RMS (Class D), 250W peak
Inputs: LFE, Line-in (L/R), Speaker-level inputs
Output: Speaker output
Power supply: 100–240V / 50–60 Hz
Phase: 0° / 180° switch
Volume control: Rotary dial + IR remote
Crossover adjustment: 30–120 Hz (rotary dial)
Auto power on/off
Weight: 10.6 kg
Triangle THETIS 300. A Compact Subwoofer with Big Impact
Whether you’re enhancing cinematic explosions or adding body to musical bass lines, the THETIS 300 delivers powerful, controlled low frequencies in a thoughtfully engineered and elegant design — the perfect companion for your main speakers.
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