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Compatibility guide

Noble, Unique Melody, Symphonium, Softears and FiR replacement cables

Replacement and upgrade cables for Noble, Unique Melody, FiR, Softears, Symphonium and Elysian, handmade to order in Singapore from USD 49 and shipped worldwide with FedEx (free from USD 250).

Noble Audio, Softears and Symphonium IEMs use 0.78 mm 2-pin sockets: choose Standard 2-pin (0.78 mm). Elysian Acoustic Labs uses Pentaconn Ear sockets: choose FlexiPlug (Pentaconn Ear tip). Unique Melody and FiR vary by model; check the table.

Cables

Cables you can order with this connector

Every cable below offers standard 2-pin under Headphone connection.

Quick facts

Connection

Noble Audio

0.78 mm 2-pin

Manufacturernobleaudio.com: Noble Audio Kronos
Softears

0.78 mm 2-pin

Retailer listinglinsoul.com: Softears RSV
Symphonium

0.78 mm 2-pin, spring-loaded, slightly recessed

Retailer listingbaybloorradio.com: Symphonium Crimson
Elysian Acoustic Labs

Pentaconn Ear

Manufacturerelysianacousticlabs.com: Elysian Acoustic Labs Apostle 2026
Unique Melody MEST

0.78 mm 2-pin, raised socket

Published reviewheadfonics.com: Unique Melody MEST
FiR RCX

Not supported

Null AudioNull Audio
Option to choose

Standard 2-pin (0.78 mm). It fits recessed and flat 0.78 mm sockets.

Null AudioNull Audio

Models

Which option for each model

Each row shows the option to choose.

Elysian Acoustic Labs Annihilator 2026 (2026)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Published reviewheadfonics.com
Elysian Acoustic Labs Apostle 2026 (2026)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Manufacturerelysianacousticlabs.com
Elysian Acoustic Labs Pilgrim (2024)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Published reviewandroidcentral.com
Elysian Acoustic Labs Annihilator 2023 (2023)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Published reviewheadfonics.com
Elysian Acoustic Labs Diva 2023 (2023)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Retailer listingaudioessence.ch
Elysian Acoustic Labs Gaea (2023)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Published reviewporta-fi.com
Elysian Acoustic Labs Annihilator (2020)

Choose FlexiPlug (Pentaconn Ear tip). Pentaconn Ear.

Published reviewheadphonesty.com
FiR Audio Radon 6 (2023)

Choose Standard 2-pin (0.78 mm). 2-pin. Fit reported as tight or unusual. Confirm with us.

To be confirmedhead-fi.org
FiR Audio Krypton 5 (2022)

Choose Standard 2-pin (0.78 mm). 2-pin.

Retailer listingaudio46.com
FiR Audio Neon 4 (2022)

Choose Standard 2-pin (0.78 mm). 2-pin.

Published reviewaudio46.com
FiR Audio VxV (2021)

Choose MMCX. MMCX.

Retailer listingthe-soundkitchen.com
FiR Audio Xenon 6 (2021)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listingbloomaudio.com
FiR Audio M5 (2020)

Not supported. Own connector. We do not make FiR RCX plugs. Ordered with RCX or MMCX; with MMCX choose MMCX.

Published reviewheadfonics.com
Noble Audio Kronos (2025)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Manufacturernobleaudio.com
Noble Audio Onyx (2024)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewheadfonics.com
Noble Audio Spartacus (2023)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listingaudio46.com
Noble Audio Viking Ragnar (2022)

Choose Standard 2-pin (0.78 mm). 2-pin.

Retailer listingaudio46.com
Noble Audio Sultan (2020)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listingdoctorhead.ru
Noble Audio Savant II (2019)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewheadfonics.com
Noble Audio Khan (2018)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewheadfonics.com
Noble Audio Sage (2017)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm, recessed socket.

Published reviewheadfonics.com
Noble Audio Kaiser Encore (2016)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewhifiplus.com
Noble Audio Katana (2016)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewtheheadphonelist.com
Noble Audio AGIS II

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Manufacturernobleaudio.com
Softears Karma (2025)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinghifigo.com
Softears RSV-MKII (2025)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinglinsoul.com
Softears EDGE (2024)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinglinsoul.com
Softears Volume S (2023)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinghifigo.com
Softears Studio4 (2022)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinglinsoul.com
Softears Cerberus (2021)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewheadfonics.com
Softears RS10 (2021)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinghifigo.com
Softears RSV (2021)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinglinsoul.com
Softears Enigma

Choose Contact us. Not confirmed. Connector not confirmed yet.

To be confirmedNo source yet
Softears SE6 Live

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinglinsoul.com
Softears Studio2

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinghifigo.com
Softears Twilight

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listinghifigo.com
Symphonium Titan (2024)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listingaudioessence.ch
Symphonium Crimson (2023)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Retailer listingbaybloorradio.com
Symphonium Meteor (2023)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewhead-fi.org
Symphonium Helios (2022)

Choose Flat 2-pin (0.78 mm). 2-pin 0.78 mm. Spring-loaded socket; our flat 2-pin plug fits.

Retailer listingheadphones.com
Symphonium Aurora (2017)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm, flat socket. Flat 2-pin also fits this flat socket.

Published reviewtheheadphonelist.com
Unique Melody MEST MKIII (2022)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm, flat socket. Flat 2-pin also fits this flat socket.

Published reviewheadfonia.com
Unique Melody Multiverse Mentor (2022)

Choose Standard 2-pin (0.78 mm). 2-pin.

Retailer listinglinsoul.com
Unique Melody 3DT (2021)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm.

Published reviewheadphonesty.com
Unique Melody MEST MKII (2021)

Choose Standard 2-pin (0.78 mm). 2-pin, flat socket. Flat 2-pin also fits this flat socket.

Retailer listinglinsoul.com
Unique Melody MEST (2020)

Choose Standard 2-pin (0.78 mm). 2-pin 0.78 mm, extended socket.

Published reviewheadfonics.com
Unique Melody Mason V3 (2019)

Choose Contact us. Own connector. Uses its own connector.

To be confirmedheadfonics.com
Unique Melody Maven

Choose Contact us. Not confirmed. Connector not confirmed yet.

To be confirmedNo source yet
Unique Melody Mentor V3+

Choose Contact us. Not confirmed. Connector not confirmed yet.

To be confirmedNo source yet

Ordering

How to order

  1. Pick a cable from the list below.
  2. Under Headphone connection, choose Standard 2-pin (0.78 mm), or FlexiPlug (Pentaconn Ear tip) for Elysian.
  3. Choose the player plug that matches the output you use most; see choosing the player plug.
  4. Not sure which socket your earphone has? Send us the model and a close photo of the socket before you order.

Before you order

Check your earphone

  • Match the marked side of the plug to the marked side of the socket. 2-pin polarity matters.
  • Elysian: Pentaconn Ear is a single-pin coaxial socket, not 2-pin. Choose FlexiPlug.

Keep reading

More guides

Find a cable for my IEM

Search 400+ earphones by brand or model.

IEM connectors explained

2-pin, MMCX, IPX, A2DC and FlexiPlug.

Choosing the player plug

3.5 mm, 2.5 mm, 4.4 mm, XLR and USB-C.

HIFIMAN Sundara

Choose Dual 3.5 mm.

Focal Clear, Clear MG

Choose Dual 3.5 mm.

Sony headphones

Z1R, Z7: Dual 3.5 mm. 1A, M1ST, MV1, M1: Single 3.5 mm.

Moondrop Chu 2

Choose Standard 2-pin.

Shure SE215

Choose MMCX.

Truthear Hexa

Choose Standard 2-pin.

KZ ZS10 Pro, ZSN Pro X, EDX Pro, Castor

Choose KZ C-pin 0.75 2PIN, or the flat plug for flat sockets.

Sennheiser HD 600 / HD 650

Choose Sennheiser HD600/650.

Sennheiser HD 560S / HD 5x9

Choose Sennheiser HD 5x9.

Sennheiser HD 800 / HD 800 S

Choose Sennheiser HD800.

LETSHUOER S12, Ember, Astralis

Choose Standard 2-pin.

7Hz Salnotes Zero, Zero:2

Choose Standard 2-pin.

Truthear Gate, Hola

Choose Standard 2-pin.

Moondrop Starfield, Starfield II

Choose Standard 2-pin.

Sennheiser IE 200 / IE 300 / IE 600 / IE 900

Choose IE300/600/900. Recessed MMCX socket.

Sennheiser IE 40 PRO / IE 400 PRO / IE 500 PRO / IE 80

Each has its own option, not standard MMCX.

Sony IER-Z1R / IER-M9 / IER-M7 / XBA

IER-Z1R: choose Sony IER-Z1R. IER-M7: MMCX.

Etymotic ER4SR / ER4XR / ER4P / ER2

ER4SR/XR: keyed MMCX. Older ER4P/B/S: own option.

Shure SE846 / SE535 / SE215 / AONIC

Standard MMCX.

64 Audio

Universals: Flat 2-pin. Aspire: IPX. Customs: IPX or Flat 2-pin, matching your socket.

JH Audio

4-pin: JH w Bass Control. 7-pin: JH 7-pin.

Westone MACH / Pro X

T2 socket: choose IPX. Older W and UM Pro: MMCX.

Ultimate Ears (UE)

Current customs and UE 150–350: IPX. Older 2-pin and SL: UE/UM/QDC 2PIN Legacy.

Campfire Audio

Most models: MMCX. Andromeda 10, Chimera: 2-pin.

Audio-Technica

Choose A2DC. IM series: plug on request.

AAW (Advanced AcousticWerkes)

Choose Standard 2-pin. Nebula One: fixed cable.

Moondrop

Choose Standard 2-pin. Original CHU: fixed cable.

qdc and CCA

KZ, CCA: KZ C-pin 0.75 2PIN or KZ / 64 Audio 0.75 Flat 2PIN. qdc: UE/UM/QDC 2PIN Legacy.

Truthear, Kiwi Ears, Simgot and more

Most: Standard 2-pin. Some: MMCX.

Empire Ears

Choose Standard 2-pin.

Vision Ears

Choose Standard 2-pin.

JOMO Audio

Choose Standard 2-pin.

Dunu

Most: MMCX. Some: 2-pin.

FiiO

Choose MMCX.

final

Choose MMCX.

beyerdynamic

DT PRO: Mini XLR 3PIN. T1, T5: Beyer T1/T5P.

HIFIMAN

Most: Dual 3.5 mm. HE1000, early HE400i: Dual 2.5 mm.

Audeze

Choose Mini XLR 4PIN.

Focal

Most: Dual 3.5 mm. Utopia: Focal Utopia.

4.4 mm balanced cables

Every cable with a 4.4 mm plug, and which FiiO players take one.

2-pin IEM cables

0.78 mm, recessed or flat: Standard 2-pin.

MMCX IEM cables

Shure, Campfire, FiiO, final, Dunu: MMCX.

IPX IEM cables

64 Audio Aspire, UE customs, Westone T2: IPX.

KZ

Raised socket: KZ C-pin 0.75 2PIN. Flat: KZ / 64 Audio 0.75 Flat 2PIN.

Extension cables

3.5 mm and 4.4 mm extensions, or a longer cable up to 3 m.

USB-C IEM cables

A DAC in the plug, for phones and laptops. Lightning too.

IEMs for gaming

A mic cable turns your IEMs into a headset.

Sources

Sources

  1. nobleaudio.com: Noble Audio Kronos 0.78 mm 2-pin.
  2. linsoul.com: Softears RSV 0.78 mm 2-pin.
  3. baybloorradio.com: Symphonium Crimson Spring-loaded, slightly recessed 2-pin.
  4. headphones.com: Symphonium Helios Spring-loaded 0.78 mm 2-pin.
  5. elysianacousticlabs.com: Elysian Acoustic Labs Apostle 2026 Pentaconn Ear.
  6. headfonics.com: Unique Melody MEST Raised 2-pin socket.
  7. Null Audio configurator, Headphone connection Options offered on each cable. Snapshot 16 Oct 2026.

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