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Triangle HiFi THETIS 300 150W Downward Facing Subwoofer BLACK ASH

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The transducers use composite membranes made of cellulose and carbon, that ensure high rigidity. Combined with oversized engines and controlled suspensions, the speakers have excellent power handling, reproducing all types of dynamics without any difficulty.

Equipped with the latest generation of Class-D amplifiers, the Thétis 340 & 300 respectively have a power of 250W/150W RMS, with a 400W/250W peak power. With steep crossover slopes, matching the Thétis subwoofers to your main speakers is easy.

The design of the cabinets is the result of a thorough vibrations study, conferring the Thétis 340 and 300 a remarkable sound.


The Thétis subwoofers feature numerous inputs, allowing them to be associated with all types of amplifiers. They include a direct LFE input for home theater set-ups, the settings will then be made from your dedicated amplifier. They also feature standard RCA inputs for Hi-Fi set-ups, and high-level inputs for amplifiers with no suitable output.

You can manually adjust the volume, the phase, and the frequency roll-off for a perfect fit with your main speakers.


The Thétis 340 and 300 operate using a bass-reflex principle, extending their bandwidths even at low volume. With a laminar port, airflow noise is significantly reduced compared to a classic tubular port.


The Thétis subwoofers include a remote control for volume and standby. An LED display on the front panel provides visibility of the sound setting.

To save energy, an automatic standby is enabled after 20 minutes if there is no signal. As soon as a new signal is received, the subwoofer is automatically reactivated.


  • Type subwooferBass Reflex
  • Driver diameter20 cm / 8,3 inch
  • Bandwidth32 Hz – 120 Hz (+/- 3 dB)
  • Rms amplifier outputRMS 150 W - Classe D
  • Main inputphase100-240V / 50-60 Hz
  • InputsLFE - Line IN (L/R) - Speaker IN
  • Phase0-180 (2 positions)
  • Dimensions11,8 x 11,8 x 13,4 inch
  • Net weight23,4 lbs

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The THETIS 300 line by Triangle

Triangle HiFi THETIS 300 150W Downward Facing Subwoofer BLACK ASH
Triangle HiFi THETIS 300 150W Downward Facing Subwoofer BLACK ASH Shipping : FREE in Canada
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