Outline GTO-SUB High Power Flyable Subwoofer 2 x 18″
Designed for productions that refuse to compromise, the Outline GTO-SUB couples twin 18″ hybrid band-pass woofers with a long, low-turbulence port to unleash authoritative bass down to 28 Hz. Matching the footprint of every GTO element and equipped with a precision rigging system, it integrates effortlessly into large-scale flown or ground-stacked arrays while delivering up to 147 dB SPL of distortion-free low-frequency energy.
Seismic Low-Frequency Performance
Meticulous phase-inversion loading, high-excursion transducers and a carefully tuned reflex alignment give the GTO-SUB an extended passband and exceptional conversion efficiency. Whether reinforcing EDM drops or underpinning orchestral scores, audiences experience accurate, high-definition bass that is both powerful and musical.
Flyable, Modular & Turnkey
The integrated GTO rigging system allows up to 16 cabinets to be flown in a standard vertical array, or up to 12 deep with selectable 3° splay for custom coverage. Sharing the exact footprint of GTO full-range modules, the subwoofer forms part of a complete turnkey solution predicted and optimised using Outline’s OpenArray 3D software.
Road-Ready Construction
Crafted from 18 mm phenolic-bonded Baltic birch plywood, the enclosure features comprehensive internal bracing to eradicate vibration modes. A scratch-resistant waterproof coating, anti-resonant steel grille, recessed handles and a purpose-built ‘3-up’ trolley ensure rapid, reliable deployment on any tour or installation.
Key Features
- 28 Hz – 160 Hz extended response for full-bandwidth systems
- 9600 W peak handling and up to 147 dB SPL half-space
- Flies up to 16 cabinets; identical footprint to all GTO modules
- Dual connector sets (NL4 & LKI-8) for flexible wiring
- Robust Baltic birch enclosure with weather protection


