You cannot plug headphones directly into a line out. The line out is designed to send a line-level signal, which is typically a higher voltage and lower impedance than what headphones require. As a result, if you connect headphones directly to a line out, you will likely hear a very quiet and distorted sound.
The line out is typically used for connecting audio signals to other devices such as mixers, amplifiers, or recording equipment. It is not intended for direct headphone use.
Using headphones with a line out can also potentially damage your headphones. The higher voltage output of the line out can overload the sensitive drivers in the headphones, leading to distortion and potentially even permanent damage.
To properly connect headphones to an audio source, you need a headphone amplifier or a dedicated headphone output. A headphone amplifier is designed to provide the appropriate voltage and impedance for headphones, ensuring that you get the best sound quality without risking damage to your headphones.
A headphone amplifier can be a standalone device that you connect between your audio source and headphones, or it can be built into certain audio equipment such as audio interfaces or headphone preamps.
When shopping for a headphone amplifier, consider factors such as power output, impedance matching, and the type of headphones you have. Different headphones have different impedance requirements, and a good headphone amplifier should be able to accommodate a wide range of headphones.
It is not recommended to plug headphones directly into a line out. The line out is designed for sending a line-level signal to other audio equipment, and using it with headphones can result in poor sound quality and potential damage to your headphones. Invest in a dedicated headphone amplifier to ensure optimal sound quality and protect your headphones.