d&b Audiotechnik B4 Subs (Set of 4)

The d&b Audiotechnik B4 is a robust and reliable 2-channel amplifier engineered for professional audio environments — designed to deliver solid performance with simplicity and longevity in mind. Built with the same precision and high-quality components that define d&b systems, the B4 offers clean power, essential processing, and a compact 2RU format that fits seamlessly into portable rigs, system distribution racks, or installation setups. Though it flies under the radar compared to its more advanced siblings, the B4 remains a dependable backbone for setups requiring straightforward, efficient amplification without unnecessary complexity.

At its heart, the B4 provides high-quality amplification suited to a variety of loudspeaker loads. Rated at approximately 2 × 600 W into 4 Ω and 2 × 300 W into 8 Ω, it is capable of driving small- to medium-sized loudspeaker systems, supplemental fill speakers, or subwoofers. Its Class‑D topology ensures high efficiency and reduced heat, while the robust toroidal transformer and high-quality output stage promise clean, distortion-free sound even under demanding conditions. With low idle power consumption and effective thermal management, the B4 is well-suited to extended live events or continuous installation use.

Unlike more feature-rich amplifiers, the B4 is designed with a no-nonsense approach, featuring no internal DSP or processing. It offers standard inputs via Euroblock and XLR connectors and delivers output via Speakon NL4. This simplicity ensures reliability and offers engineers the freedom to tailor signal processing externally using dedicated DSP units if desired. The lack of onboard DSP keeps system costs lower and reduces potential failure points in the signal chain.

Durability and usability are key hallmarks of the B4. The 2RU chassis makes it suitable for flight cases or 19″ racks, while rugged steel construction and high-grade connectors ensure resilience during transport and setup. The amplifier runs cool and quiet, benefiting from designed-in ventilation and heat dissipation, so it remains operational even under continuous load. Front-panel indicators include power, clip, signal, and thermal warning LEDs, giving clear feedback during operation.

Ideal for straightforward audio amplification, the d&b Audiotechnik B4 is well suited for applications such as side‑fill systems, delay fills, zone distribution in live venues, or fixed installations in houses of worship and corporate spaces. Its no-fuss design delivers reliable power with minimal maintenance, making it a trusted workhorse in any professional d&b deployment.