What is Codecs?

A codec is the compression format that carries sound over Bluetooth, and each phone and headphone pair supports a set of them. Support for a higher tier format usually means less compression, so music sounds closer to the original. Audio-Technica supports aac and ldac, and Baseus matches it with aac and ldac. beyerdynamic and Blackview both list aac, while Bose supports aptx adaptive. Buyers who stream from a phone running the same format get the best result, so check both ends before buying.