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Improve this answer. News and Special Offers occasional. Auxiliary Port AUX. An auxiliary port AUX is a type of standard communications port on a device that accommodates audio signals for: MP3 players. Headphones and headsets. And other audio devices, including some fairly traditional audio technologies. Synonyms Auxiliary Jack, Auxiliary Input. Share this Term. Tech moves fast! Stay ahead of the curve with Techopedia! Join nearly , subscribers who receive actionable tech insights from Techopedia.
These aux sends allow for alternative mixes within a mixing console and are often used to feed different monitors mixes for different musicians on stage or to feed external recorders.
This means that the audio signals are electrical AC voltages that travel through conductive wires in a cable. That being said, due to the digital nature of many audio devices, there are often analog-to-digital converters immediately at the jacks of both headphone and auxiliary ports. For example, the audio being played within a smartphone is digital and must be converted to analog audio before being outputted from the headphone jack.
This is why they so often get confused. The headphone output of a smartphone or laptop looks the same as the auxiliary input of a car stereo. As mentioned previously, the auxiliary input is designed as a sort of universal plug that accepts various audio sources.
The 3. Although headphone jacks vary widely in size and wiring, the 3. A simple male-to-male 3. There are plenty of 3. Aux outputs have relatively low-level signals that are designed to drive fairly high-impedance loads.
Most commercially available headphones have a much lower impedance than the aux out is designed to drive. This will result in a fairly weak signal, and it may be distorted. To get a better understanding of impedance and headphones, check out my article The Complete Guide To Understanding Headphone Impedance.
For more information on the sizes of headphone plugs and jacks, check out my article The Differences Between 2. Aux outputs can be either balanced mono or unbalanced stereo. Aux send line outputs sometimes have a single TRS connector which can be wired as balanced mono rare or unbalanced stereo common.
Aux send line outputs may also have two separate connectors for balanced left channel audio and balanced right channel audio. This brings us to our next point. The aux input is a 3. This allows the aux input to accept stereo signals from other devices with ease. The microphone on the second ring or sleeve, depending on the wiring standard will be sent to the ground the sleeve of the TRS. This allows full compatibility between aux input and smartphones, laptops and tablets. Plug one end of the audio cable into the "headphone" port on your mobile device and the opposite end to the AUX port.
Set the volume on your mobile device to about 50 percent, then start the device's music player.
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