Optimal Audio Cuboid 6TX


6.5″ Full-Range Loudspeaker, 100V/Low Impedance

  • 8 ohm or 70/100V line operation
  • Compact, powerful performance
  • Mount portrait/landscape with flexibility
  • Max SPL: 107dB continuous, 113dB peak
  • Wide 130° x 120° coverage angle
  • IP54 rated, suitable for outdoors
  • Wall bracket included for installation
  • *Priced per speaker



The Optimal Audio Cuboid 6TX is a compact 6.5” loudspeaker, featuring full-range, two-way, passive design aimed at delivering exceptional audio quality in compact settings. It’s tailored for distributed applications demanding high-fidelity background music and clear speech reproduction.

With its sleek design and inclusive mounting accessories, the Optimal Audio Cuboid 6TX offers versatile installation options, allowing for portrait or landscape orientation. Additionally, an optional weatherproof terminal cover extends its outdoor usability to IP54 standards.

Equipped with a 6.5” low-frequency driver and a 1” silk dome high-frequency driver paired with a shallow waveguide, the Cuboid 6TX ensures consistent high-frequency dispersion.

Each Optimal Audio Cuboid 6TX is outfitted with an upgraded 60W transformer, facilitating premium sound delivery when connected to 70V or 100V taps, or operating at low impedance. Tap selection is conveniently managed via a rotary switch located on the rear of the cabinet.

To augment bass performance, the Cuboid 6TX can be combined with the Sub 10, while utilizing a SmartAmp or powered Zone for amplification. These systems offer optimal sound configurations and incorporate limiters to safeguard drivers during high-volume playback.

Integrating seamlessly with Zone and WebApp, setup and user control of the system are intuitive. Furthermore, the addition of ZonePad wall controllers provides supplementary control options.


Colour Options

Black, White

Maximum SPL


Watts (Peak)

240 W


100 V Line, 8 ohms


1x 1” Silk Dome, neodymium motor system (HF), 1x 6.5” coated paper, ferrite motor system (LF)

Suitable For Outdoors


Dimensions (W x H x D)

200 x 320 x 190 mm


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