On Tour iBT and Zephyr 550 have a number of features in common. They both use Bluetooth to make nearly instantaneous connections with your iPhone, iPad, or iPod touch, streaming stereo audio from speakers mounted behind perforated grilles. Each has a microphone built in that allows users to make and receive phone/FaceTime calls, as well as integrated volume and phone call buttons, plus ports for power, auxiliary audio-in, and—unusually—USB.…
