The main designations for some common audio connectors, especially for jack (phone) connectors, are based on the number of contact points they have and their function:
- TS (Tip-Sleeve): 2 contacts, typically used for mono audio signals.
- TRS (Tip-Ring-Sleeve): 3 contacts, used for stereo audio (left and right channels) or mono balanced audio.
- TRRS (Tip-Ring-Ring-Sleeve): 4 contacts, often used for stereo headsets with a microphone or video with stereo audio.
- TRRRS (Tip-Ring-Ring-Ring-Sleeve): 5 contacts, used for balanced stereo audio or specialized applications like dual microphones.
For XLR connectors commonly used in professional audio:
- 3-pin XLR: Balanced audio (pin 1 ground, pin 2 positive, pin 3 negative).
- 4-pin XLR: For intercom headsets or power.
- 5-pin XLR: Stereo microphones or DMX lighting control.
Additionally, the size of jack connectors corresponds to their application:
- 6.35mm (1/4 inch) for instruments and professional audio.
- 3.5mm (mini jack) for headphones and portable devices.
- 2.5mm (sub-miniature) less commonly used.
These designations help identify the number of conductors and the typical usage of audio connectors in various devices.
