The Bi8 SUB from d&b audiotechnik is a compact installation subwoofer engineered to deliver high-performance low frequency reinforcement in permanent audio installations. Designed as the installation counterpart to the B8 subwoofer, the Bi8 SUB maintains identical acoustic performance while offering installation-specific modifications in cabinet design and mounting options. It features two 6.5-inch drivers housed within a bass-reflex enclosure, offering precise and extended low-end reproduction from 43 Hz to 170 Hz. When configured in 100 Hz mode, the upper frequency limit is adjusted to 125 Hz to suit specific system integration needs. With a low-profile design measuring just 170 millimetres in height, the Bi8 SUB is ideally suited for environments with spatial constraints, including hospitality venues, corporate spaces, retail areas and houses of worship. Its ability to deliver high sound pressure levels from a discreet enclosure ensures optimal audio performance without compromising architectural or aesthetic considerations. The Bi8 SUB can be mounted in either horizontal or vertical orientation using the integrated M8 threaded inserts, offering flexibility during installation. Available in Standard, Special Colour and Weather Resistant versions, the Bi8 SUB supports a wide range of indoor and outdoor applications. The inclusion of robust connectivity options further enhances its suitability for professional integration. As part of the d&b xS Series, the Bi8 SUB represents a reliable solution for integrators and consultants seeking consistent low frequency performance in compact installation formats.