Focal Maestro Utopia III loudspeaker | Stereophile.com
UNIF | Focal Top
Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base - Eisco Labs: Science Classroom Optics Kits: Amazon.com: Industrial & Scientific
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Amazon.com: Bruce Charles Designs Spinning Top Base - Precision-Machined Teak Top Spinning Base and Fused Silica Spinning Glass Double Concave Lens 100mm/4 Dia 300mm Focal Length - Best EDC Spin Top Lovers
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The Focal Sopra #2 Speaker Review | Steve Huff Hi-Fi and Photo