Although we've covered hundreds of Bluetooth accessories and dozens of AirPlay alternatives, it's rare to see both wireless streaming technologies together in an all-in-one speaker. Cambridge Audio now has two of them: Minx Air 100 ($449) and Minx Air 200 ($599) look almost identical save for their size. They're both made of surprisingly substantial-feeling plastic and metal, with significant heft, though their speakers are somewhat surprising: 100…