Audio connectors
Every connector in the parameter database — diameter, pole count, signal topology and reference standard.
4-Pin XLR Balanced — Desktop Headphone Standard
4-pin XLR is the de-facto standard for balanced headphone connections on desktop amplifiers, dating back to the late-1990s era when balan…
0.78 mm 2-Pin — Universal IEM Connector
Two parallel 0.78 mm-diameter cylindrical pins spaced 2 mm apart, friction-retained by the IEM-side socket — the simplest possible mechan…
MMCX — Micro-Miniature Coaxial IEM Connector
Micro-Miniature Coaxial — an RF-industry connector that the audio industry adopted for IEM cable terminations in the early 2010s. Coaxial…
Pentaconn Ear — Premium IEM Connector
Pentaconn Ear is the IEM-side counterpart to the 4.4 mm balanced source connector — also developed by Nippon Dics, also under the Pentaco…
6.35 mm TRS (1/4″ Phone Jack)
Invented in 1878 for telephone-switchboard patching, the 1/4-inch (6.35 mm) phone jack predates every other audio connector in the databa…
2.5 mm TRRS Balanced (Legacy Portable Balanced)
The 2.5 mm TRRS balanced connector emerged in the early 2010s as portable-audio's first attempt at delivering true differential balanced…
3.5 mm TRRS — Headset Standard (Audio + Mic)
The 3.5 mm TRRS (tip-ring-ring-sleeve) adds a fourth contact to the standard TRS, carrying an inline microphone signal. Two competing pol…
3.5 mm TRS (1/8″ Stereo) Headphone Jack
The 3.5 mm tip-ring-sleeve (TRS) phone connector has been the consumer headphone standard since the late 1960s, when miniaturization of t…
4.4 mm Pentaconn Balanced Connector
Standardized under JEITA RC-8141C in 2016, the 4.4 mm Pentaconn balanced connector replaced 2.5 mm TRRS as the de-facto portable-balanced…