Quick view Poly-Planar Poly-Planar Spa Side Smartphone Enclosure w/Door - Black Spa Side Smartphone Enclosure with Door - BlackPolyPlanar is the leading manufacturer of spa specific audio systems designed in the USA. The Poly-Planar PM2 is designed to end the frustration of where to place your smartphone or MP3 while in the spa. The... Now: $36.05 MSRP: Was: Add to Cart