KS Digital (KSD) is a German studio monitor and loudspeaker manufacturer based in Saarbrücken, with development and production handled in-house at the company's Innovation Campus location. The company traces its lineage back to KS-Beschallungstechnik, with co-founder Dieter Klein working on loudspeaker design since the 1970s and Johannes Siegler — an electrical engineer with a background in professional studio recording — formally establishing the brand in the mid-1990s. KSD presented what it describes as the world's first digitally equalized studio monitor at the Tonmeistertagung in 1996.

The brand's signature technology is FIRTEC, a proprietary FIR filter-based DSP system used across the line for phase-linear correction. Other in-house technologies include DMC (Dynamic Membrane Control) and NExT (Nearfield Extension). The product range spans the C-Reference series of coaxial point-source monitors (such as the C5, C8, C88 and Linemaster), the A line of active monitors (A100, A200 MK2, Mainmaster), B-Reference subwoofers, and immersive multichannel arrays for Dolby Atmos and 3D audio installations.

KS Digital occupies a niche in the high-end mastering and reference-monitoring segment, with a reputation among engineers for transparent, time-aligned coaxial designs. Speakers are hand-built in Germany and shipped with individually signed certificates of authenticity. Distribution is handled through specialist pro-audio retailers across Europe, North America and Asia.

KS Digital has 2 products cataloged on Equipboard, including Active & Passive Monitors. Their gear is featured by 1 artist, with the strongest followings in Electronic and Pop. Notable users include Tujamo.