Recently, I offered a first look at Audioengine’s $149 W1 Wireless Audio Adapter —a kit that contains USB audio transmitter and receiver units along with a power supply and a handful of audio cables.

To hook your standard wired headphones up to your iPhone, you’ll need a 3.5-millimeter to Lightning adapter. Whether you have a set of lightweight earbuds or a padded pair of over-ear headphones, the ...