ProJive XLR’s design is pretty straightforward: you get a four-foot-long cable with a male 3.5mm plug on one end—notably tapered for connection to encased devices—and a substantially metal male XLR plug on the other, split off with several inches of cabling to accommodate a female 3.5mm port. The male 3.5mm plug goes into your iPhone, iPod, or iPad, while the female 3.5mm port lets you connect your choice of monitoring headphones,…