The main difference between Aux and Bluetooth is that one is wireless and the other is wired. An Aux (auxiliary) connection refers to any secondary wired connection, but is commonly associated with the 3.5mm headphone jack. Bluetooth is a wireless technology standard that connects keyboards, headsets, speakers, controllers, and other peripherals to a host computer such as a laptop, phone, or tablet.
The Truth About Wired vs. Bluetooth Audio Connections | Drew's Audiophile Tech Tips
Aside from the distinction between wired and wireless, what differentiates an Aux connection from a Bluetooth connection? Which is better when it comes to convenience, compatibility, and sound quality? Here we discuss the similarities and differences between Aux and Bluetooth.
While Aux can refer to any auxiliary or secondary input, it is more commonly associated with the 3.5mm headphone jack, which has been around since the 1950s. Aux inputs are also called phone jacks, stereo jacks, headphone jacks, audio jacks, 1/8-inch cords, or some variation of these terms.
Bluetooth, meanwhile, refers to a wireless connectivity standard for computers and peripherals. While not as universal as Auxiliary inputs, Bluetooth is becoming increasingly common.
