Nearly identical cosmetically to JBL's equally new On Stage IV, the On Stage Micro III ($100) is a comparatively smaller, less powerful, and less expensive alternative. Built using the same "weave" design language of black glossy plastic and silver metallic overlapping arcs, On Stage Micro III packs only two Odyssey speakers inside rather than four, and requires only four AA batteries instead of six, accessible via a compartment on the bottom, or…