The T-SUB is a high-performance bass-reflex subwoofer developed by d&b audiotechnik to enhance low-frequency reproduction within compact and mid-sized professional sound systems. Designed for integration with the T10 loudspeaker, the T-SUB provides additional low-end headroom, enabling system designers to achieve balanced frequency coverage across a wide range of live sound applications. This includes use in theatres, corporate events, houses of worship, touring productions, and fixed installations. The T-SUB houses a high-excursion 15-inch driver and incorporates d&b SenseDrive technology when operated with the D12 amplifier, ensuring precise control and improved driver response. It can be deployed in ground-stacked or flown configurations, either mounted above a T10 array or as an independent vertical column. The robust cabinet construction and integrated rigging hardware support flexible deployment while ensuring reliable performance in demanding environments. Built from marine-grade plywood and finished with a protective paint coating, the T-SUB is designed to endure the rigours of professional use. The front grille, combined with acoustically transparent foam, safeguards internal components without compromising sound quality. With dual NL4 connectors for parallel signal routing, the T-SUB offers straightforward integration into existing systems. As a key component of the d&b T-Series, the T-SUB provides scalable low-frequency reinforcement that meets the precision and reliability requirements of professional audio installations.