Optimal Cuboid 8

Two-way, full range, passive, 8" loudspeaker

Regular price $959.00
Regular price Sale price $959.00
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Regular price $959.00
Regular price Sale price $959.00

Cuboid 8 is a full range, two-way, passive, 8” loudspeaker designed to outperform its compact size. For short to medium throw distances, it effortlessly delivers rich and detailed sound with punch and precision.

With its wooden cabinet, steel grille and optional mounting hardware the professionally presented Cuboid 8 can be fixed in either portrait or landscape mode for a flexible, simple installation.

Cuboid 8 features an 8” (200mm) low frequency (LF) driver for impressive punch and midband with a 1″ (25mm) exit high frequency (HF) compression driver for clarity of vocal and high frequency projection. The HF section delivers consistent coverage in either plane from a user-rotatable horn.

For enhanced bass performance, Cuboid 8 can be teamed with Sub 10 or Sub 15.

When coupled with Zone and WebApp, system set up and end user control is simple and intuitive, and can be further supplemented by ZonePad wall controllers.


  • Compact sized wooden cabinet

  • Portrait or landscape mounting options

  • Rotatable high-frequency horn

  • 90Hz – 20kHz frequency response

  • Max SPL 115dB (cont), 121dB (peak)

  • 90˚ horizontal x 50˚ vertical coverage

TYPE Two-way, full range, passive loudspeaker
FREQUENCY RESPONSE (with preset) 90Hz – 18kHz ± 3dB -10dB @ 62Hz
DRIVERS LF: 8” (200mm), ferrite motor system HF: 1” (25mm) exit/1” (25mm) voice coil, polymide dome compression driver
RATED POWER 200W (AES) 800W (Peak)
NOMINAL IMPEDANCE 8 Ohms
SENSITIVITY (1W/1m) 92dB
MAXIMUM SPL 115dB (cont), 121dB (peak)
CROSSOVER 2.9kHz passive
DISPERSION (-6dB) 90˚ H x 50˚ V (user-rotatable)
ENCLOSURE Trapezoid wooden cabinet
FINISH Black textured paint
PROTECTIVE GRILLE Black perforated steel with scrim cloth backing
CONNECTORS 2x NL4 type
PIN CONNECTIONS (INPUT) 1+/1-
FITTINGS 16 x M8, inset bolts
DIMENSIONS (W) 256mm x (H) 422.5mm x (D) 261mm (W) 10.08” x (H) 16.63” x (D) 10.28”
WEIGHT 10kg (22.05lbs)

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