Audio and Sound Equipment Design Session Portable Outdoor Speaker by Qinwen Feng Session is a portable outdoor speaker designed for high fidelity listening in open environments. The system includes a 165 mm subwoofer, two 76 mm midrange drivers, two 25 mm tweeters and three passive radiators. The chassis combines metallic finish injection molded plastic with anodized aluminum grilles and plates. Four nylon corners and five rubber handles protect the speaker and allow carrying from several angles. Three rotary knobs on the rear control volume, treble and bass. The sculptural form is inspired by monolithic rock formations of desert landscapes.