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Loudspeakers
Carry the dipole open-baffle reference Siegfried Linkwitz spent a career refining, now a 2026 Editors Choice.
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about linkwitz
Linkwitz carries forward the work of Siegfried Linkwitz, the German-American engineer who co-authored the Linkwitz-Riley active crossover topology — one of the most widely used crossover alignments in loudspeaker design. Linkwitz Lab grew out of his decades of research into dipole and open-baffle radiation as a route to reducing room interaction and rendering a more natural soundfield. After Siegfried Linkwitz's death in 2018, the design legacy and direct-sales operation continue. The reference product is the LX521.4, a four-way fully active dipole open-baffle speaker system. Reviewed in The Absolute Sound by Tom Martin and named a 2026 Editors Choice Award winner, the LX521.4 with its dedicated amplification lands around the $24,000 mark — a statement open-baffle design rather than a conventional box speaker. The lineup also includes earlier and adjacent designs in the open-baffle and active-dipole tradition. Distribution is deliberately direct and specialist. Completed systems sell through LINKWITZ.store, run by Dr. Frank Brenner, while Madisound supplies DIY kits for builders who want to assemble the designs themselves. That dual path keeps the brand reachable for both finished-system buyers and the hands-on community. Beyond TAS, the designs have been covered by Home Theater HiFi and Enjoy the Music. It competes in the open-baffle and dipole niche occupied by Spatial Audio, PureAudioProject, and Emerald Physics, distinguished by the Linkwitz engineering name and active-system approach. The operation is rooted in Northern California, where Siegfried Linkwitz developed the designs.