
Two-Way Passive
Full-Range 12" loudspeaker
The Optimal Audio Cuboid 12 is a high-performance full-range passive loudspeaker, engineered to deliver powerful, detailed sound in large commercial environments. Ideal for bars, live venues, and leisure spaces, it provides excellent coverage, strong low-frequency response, and reliable performance for both background and high-energy audio applications.


Cuboid 12 is a full range, two-way, passive, 12” loudspeaker designed to perform. For applications requiring that extra power and performance, 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 12 can be fixed in either portrait or landscape mode for a flexible, simple installation.
Cuboid 12 features a 12” (300mm) low frequency (LF) driver for added bass 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 12 can be teamed with Sub 15.
When teamed with Zone and WebApp, system set up and end user control is simple and intuitive, and can be further complemented by ZonePad wall controllers.
Data sheets, manuals and resources for the Cuboid 12

Our AV experts are ready to help you find the perfect solution for your project.
Cuboid 12 is a full range, two-way, passive, 12” loudspeaker designed to perform. For applications requiring that extra power and performance, 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 12 can be fixed in either portrait or landscape mode for a flexible, simple installation.
Cuboid 12 features a 12” (300mm) low frequency (LF) driver for added bass 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 12 can be teamed with Sub 15.
When teamed with Zone and WebApp, system set up and end user control is simple and intuitive, and can be further complemented by ZonePad wall controllers.
| TYPE | Two-way, full range, passive loudspeaker |
| FREQUENCY RESPONSE (with preset) | 62Hz - 20kHz ± 3dB -10dB @ 47Hz |
| DRIVERS | LF: 12” (300mm), ferrite motor system, HF: 1” (25mm) exit/1.4” (36mm) voice coil, polyimide dome compression driver |
| RATED POWER | 300W (AES) 1200W (peak) |
| NOMINAL IMPEDANCE | 8Ω |
| SENSITIVITY (1W/1m) | 98dB |
| MAXIMUM SPL | 123dB (cont), 129dB (peak) |
| CROSSOVER | 2.5kHz passive |
| DISPERSION (-6dB) | 80˚ H x 50˚ V (user-rotatable) |
| ENCLOSURE | Trapezoid wooden cabinet |
| FINISH | Black textured paint |
| PROTECTIVE GRILLE | Black perforated steel with scrim cloth backing |
| CONNECTORS | 1x NL4, 1x 4 pin Euroblock |
| PIN CONNECTIONS | NL4 Input only 1+/1-, 4-pin Euroblock with +/- for input and +/- for link connections |
| FITTINGS | 21 x M8, inset bolts |
| DIMENSIONS | (W) 360mm x (H) 575mm x (D) 392mm (W) 14.17” x (H) 22.64” x (D) 15.43” |
| WEIGHT | 20kg (44.09lbs) |
| ACCESSORIES (available separately) | Wall Bracket B, U Bracket C, M8 Eye Bolt |
| RECOMMENDED SUB | Sub 15 |
About Penguin Media Solutions
Penguin Media Solutions is a professional audio, video, and lighting design, installation, and maintenance company based in Brighton, UK. As an authorised Martin Audio dealer, we provide high-performance AV systems for commercial venues, hospitality, and event spaces across Brighton, London, and South-East England.
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