Today, we’re looking at four recent wireless releases: Brookstone’s Big Blue Media Tower ($400) and Ecoxgear’s Ecoxbt ($130) are on the Bluetooth side, with AQ Audio’s AQ SmartSpeaker ($179) and Bowers & Wilkins’ A7 ($800) representing AirPlay. Collectively, these speakers are noteworthy because they demonstrate today’s wide variation in wireless speaker pricing and features—AQ Smart Speaker is the least…