Buchardt Audio Announces the S400 MK3

17 March 2026: Buchardt Audio has announced the S400 MK3, the latest generation of one of the company’s most established loudspeakers. First shown as a prototype in 2016, the S400 quickly became a cornerstone of the Buchardt lineup and has since built a reputation as one of the most widely recommended stand-mount speakers in its category.

With the S400 MK3, Buchardt describes the design as a complete overhaul. The new model introduces a larger cabinet along with an all-new tweeter and woofer, aimed at improving dynamics and headroom while preserving the balanced and natural presentation that has defined the S400 series since the beginning. According to the company, only a single component has been carried over from the previous generation.

One of the most notable changes is the move to a 7.5-inch SB Acoustics Satori Papyrus Woofer. Buchardt states that the driver offers 65.5 percent greater displacement headroom compared with the S400 MK2, allowing for increased dynamic capability, stronger bass authority, and greater physical impact, while the cabinet size itself has grown by only 18 percent.

The tweeter has also been redesigned. The S400 MK3 uses a custom 26 mm aluminum dome unit paired with a newly developed waveguide. According to Buchardt, the goal was not to increase brightness but to improve refinement, with higher perceived clarity and resolution while maintaining the smooth, fatigue-free character the S400 series is known for.

The company continues its collaboration with Jantzen Audio on the crossover, using premium components throughout the signal path. The crossover topology is described as somewhat simpler than that of the MK2, employing 1st-order filters, though Buchardt says its focus on high-quality components remains unchanged.

The S400 MK3 will initially be available through a limited pre-order campaign, with 75 pairs offered per finish at the introductory price. Estimated delivery is currently listed as late summer 2026.

More details can be found on the S400 MK3 product page.