Linkwitz Orions. The Active, Quad-Amplified, Open Baffle Loudspeakers
Siegfried Linkwitz's Orion-4 Speakers from Wood Artistry | Stereophile.com
ORION-4
Resonance Frequency
DIY Hell: The “Spirit of Orion” A Full Frequency, OB/Subwoofer Inspired By Siegfried Linkwitz's Orion Loudspeakers. Part I - HighFidelityReview - Hi-Fi systems, DVD-Audio and SACD reviews
6moons.com - industry features: Linkwitz Lab's Orion
6moons.com - industry features: Linkwitz Lab's Orion