The differences between HOOYA's 6.35mm headphone jacks and 3.5mm headphone jacks are as follows: Dimensions - The 6.35mm headphone jack has a diameter of 6.35mm and a length of 30 - 31mm. It is commonly known as the "large plug". - The 3.5mm headphone jack has a diameter of 3.5mm and a length of typically 14mm. In some cases, it can be as long as 17mm for video applications. It is known as the "small plug". Application Scenarios - HOOYA's 6.35mm jacks are mainly used in professional audio equipment, such as guitar amplifiers, audio mixers, professional monitoring headphones, electric guitars, and electronic keyboards. They are widely applied in professional scenarios like band performances and music recording. - HOOYA's 3.5mm jacks are widely used in consumer - level audio devices, such as mobile phones, tablets, portable music players, and laptops. Performance - Due to the larger size, HOOYA's 6.35mm jacks can carry higher power and current. Their metal casings provide better electromagnetic shielding, reducing external interference and ensuring more stable and higher - quality audio signal transmission. They are especially suitable for long - distance transmission and scenarios with strict sound quality requirements. - While HOOYA's 3.5mm jacks can meet daily audio needs, they are relatively weaker in power handling, anti - interference capability, and audio stability. They are more suitable for short - distance transmission and scenarios with moderate sound quality requirements. Structure and Function - HOOYA's 6.35mm jacks are generally three - segment TRS (Tip - Ring - Sleeve) interfaces, corresponding to left channel, right channel, and ground, used for transmitting stereo or mono audio signals. - HOOYA's 3.5mm jacks come in two types: three - segment and four - segment. The three - segment type is for audio signal transmission, while the four - segment TRRS (Tip - Ring - Ring - Sleeve) interface adds a microphone channel, enabling both audio playback and microphone input.