Years ago, Audio-Technica was one of the first companies to create inexpensive, color-matched earphones for Apple’s then-popular iPod mini, and ATH-CK400i is the latest heir apparent to that concept—there are actually six different color options ranging from jet black and pure white to versions with blue, red, and pink housings and cables, plus a green-cabled version with black housings. None is specifically color-matched to Apple’s…