FreePlay's compression drivers are in stereo, though imaging will likely be nil at normal listening distances. Mackie FreePlay is a compact speaker that looks like a mutant boom box, with two one-inch compression drivers flanking an eight-inch woofer. Such it is with the new Mackie FreePlay ($500 list), an unorthodox little mixer/speaker combo that aims to solve a thousand sound problems. When the first word that pops into one's head when trying to describe a product is “solution”, its manufacturer is likely onto something good.