David Pogue reviews wireless speakers, and finds that only two out of five he looks at have real worth: Pogue looks at 900 MHz wireless speakers which don't employ any real networking protocols--they're essentially spread-spectrum remote sound systems using a base station plugged into a stereo and speakers that pick up the signal so that you can untether your sound. Range is generally poor and interference prevalent. But he does find two sets of speakers that have both good range and few compromises: for outdoor use, the Advent ADVW801 ($70); for indoors, the Acoustic Research AW871 ($120).