Announced at CES in January, Braven's newest model Braven 850 ($300) is its largest Bluetooth speaker yet -- a direct challenger to Jawbone's Big Jambox, with better features. Beyond dramatically improving sound and volume performance from the smaller, cosmetically similar Braven 650, Braven 850 is now able to wirelessly pair with a second speaker for expanded stereo sound, and use its integrated USB port to charge iPads and other devices at up to…
