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Guide

IEM cable connectors

The connector on your earphone decides which cable fits. Check the socket, not the brand: one maker can use different connectors across its range, and similar-looking sockets can differ in recess depth or keying.

Common connectors

What each option is

2-pin 0.78 mm (standard)

Two 0.78 mm pins. Our most widely compatible plug: it fits both recessed and flat 2-pin sockets, so it suits most 2-pin earphones. Match the marked side of the plug to the socket.

Null AudioNull Audio
Flat 2-pin

For earphones with a flat 2-pin socket. If you are not sure whether your socket is flat or recessed, choose standard 2-pin, which fits both.

Null AudioNull Audio
UE / UM / qdc 2-pin

2-pin with a raised plug housing, for UE, Unique Melody and qdc earphones with an extended socket. Choose UE/UM/QDC 2PIN Legacy.

Null AudioNull Audio
JH 4-pin and 7-pin

JH Audio’s own connectors with the bass adjuster on the cable. Choose JH w Bass Control for 4-pin or JH 7-pin for 7-pin; both work like JH Audio’s own cable.

Null AudioNull Audio
MMCX

Coaxial snap-on connector that usually rotates once seated. Some earphones recess or key the socket, so a standard MMCX plug may not fit them: see the model guides.

General referenceGeneral reference
A2DC

Audio-Technica's connector.

General referenceGeneral reference
IPX and T2

IPX is used on current Ultimate Ears custom IEMs. Our IPX plug also fits T2 sockets, such as Westone MACH and Pro X and Ultimate Ears UE 150/250/350, so choose IPX for those too.

Null AudioNull Audio; UE cable pages for IPX use
Not supported

0.75 mm 2-pin (for example JH Billie Jean) and FiR RCX. 64 Audio customs are supported: they have an IPX or a 2-pin socket, so choose IPX or Flat 2-pin to match.

Null AudioNull Audio

Null Audio

FlexiPlug

FlexiPlug is our interchangeable connection system. It lets you change the earphone-side connector on one cable. Current tips: 2-pin, IE300, A2DC, IPX, Pentaconn Ear and qdc 2-pin.

Sources

Sources

  1. Null Audio configurator, Headphone connection Connector options listed on this page. Snapshot 16 Oct 2026.
  2. Pentaconn — Connector reference 0.78 mm 2-pin pin geometry, as general background.

Prepared 17 Oct 2026. Not yet reviewed by Null Audio.