A lightweight acrylic laminated plinth strengthened using a new improved double brace system mounted specifically where the increased rigidity is required (between the tonearm mounting and the main hub bearing) which forms a structurally sound “stressed beam” assembly. This rigid plinth design prevents energy absorption and unwanted resonance, which will add unnatural distortions to the music. Equally, heavier mass can transfer more unwanted energy, such as motor or bearing noise directly into the rotating record. The use of braces instead of the complete skin allows double thickness phenolic resin in these key areas while providing further weight reduction to the plinth which directly addresses the issue of mass absorption and unwanted energy transmission. The Planar 3 features the RB330 tonearm.