Shipped from Singapore; delivery options and costs shown at checkout Free FedEx Priority over USD 250 Handmade in Singapore since 2008

Compatibility guide

64 Audio replacement and upgrade cables

Replacement and upgrade cables for 64 Audio, handmade to order in Singapore from USD 89 and shipped worldwide with FedEx (free from USD 250).

For 64 Audio universal IEMs, such as the U12t, U18t, U18s, U6t, U4s, Nio, Volür, Ocean, Solo, Duo and the tia Fourté and Trió, choose Flat 2-pin (0.78 mm): they have flat 0.78 mm 2-pin sockets. Our standard 2-pin (0.78 mm) also fits, so choose it on a cable that has no Flat 2-pin option. The Aspire 1, 2, 3 and 4 are the exception: they use IPX (T2) sockets, so choose IPX.

Cables

Cables you can order with this connector

Every cable below offers Flat 2-pin under Headphone connection. On other cables, choose standard 2-pin (0.78 mm).

Lune Series MKIX Premium Upgrade Cable for Headphone | IEM

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥1,014.00 Tiburon MKV UP-OCC Cryo Copper Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥1,355.00 Arete Series MKVI Premium Upgrade Cable for Headphone | IEM

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥742.00 Thera MKV UP-OCC Cryo Silver Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥2,716.00 Ethos Ultra Coaxial Upgrade Cable for IEM | Headphone

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥606.00 Hakone MKV UP-OCC Cryo Silver/Copper Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥2,035.00 Aoraki MKIV Gold Silver Tri-Hybrid Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥4,757.00 Epsilon 5 Pro 6N UP-OCC Copper Headphone & IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥878.00 Istana MKII Graphene Coated Copper Hybrid Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥7,479.00 Vanda 7N UP-OCC Cryo Copper Headphone/IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥1,695.00 Ethos MKVII Silver-Plated Copper IEM Cable

Headphone connection: Flat 2-pin (0.78 mm)

 From ¥606.00

Quick facts

Connection

Universal IEMs

0.78 mm 2-pin, per 64 Audio product pages (U12t, U18t, U18s, U6t, U4s, Nio, Volür)

Manufacturer64 Audio U12t
Aspire 1–4

IPX (T2) sockets on all four Aspire universals

Null AudioNull Audio
Custom IEMs

IPX or 2-pin socket, chosen in 64 Audio’s custom designer (Socket type: IPX / 2-PIN)

Manufacturer64 Audio custom designer
Socket style

Flat (flush) 2-pin sockets on the universals other than Aspire. Reviews describe the same on the U18t and tia Trió.

Null AudioNull Audio; Audio Solace, tia Fourté and U18t
Option to choose

Flat 2-pin (0.78 mm) for universals (standard 2-pin also fits); IPX for Aspire 1–4; IPX or Flat 2-pin (0.78 mm) for customs, matching the socket

Null AudioNull Audio

Models

Which option for each model

Universal models first by year; customs are marked.

Fourté Blanc (2023)

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

Retailer listinge-earphone.jp
Solo (2023)

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

Retailer listingaudio46.com
Volür (2023)

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

Manufacturer64audio.com
Duo (2021)

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

Published reviewheadphones.com
U18s (2021)

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

Manufacturer64audio.com
U4s (2021)

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

Manufacturer64audio.com
Fourté Noir (2020)

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

Published reviewheadfonia.com
Nio (2020)

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

Manufacturer64audio.com
tia Trió (2019)

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

Published reviewheadfonics.com
A18t (custom) (2018)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
U18t (2018)

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

Manufacturer64audio.com
U6t (2018)

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

Manufacturer64audio.com
A12t (custom) (2017)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
tia Fourté (2017)

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

Published reviewaudiosolace.com
U12t (2017)

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

Manufacturer64audio.com
A18s (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
A2e (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
A3e (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
A3t (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
A4s (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
A6t (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
Aspire 1

Choose IPX. IPX.

Null AudioConfirmed by Null Audio
Aspire 2

Choose IPX. IPX.

Null AudioConfirmed by Null Audio
Aspire 3

Choose IPX. IPX.

Null AudioConfirmed by Null Audio
Aspire 4

Choose IPX. IPX.

Null AudioConfirmed by Null Audio
N8 (custom)

Choose IPX or Flat 2-pin (0.78 mm). IPX or 2-pin (chosen when ordering). Your custom has either an IPX or a 2-pin socket. Check which one and choose the matching plug.

Null AudioConfirmed by Null Audio
Ocean

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

Null AudioConfirmed by Null Audio

Ordering

How to order

  1. Pick a cable from the list below.
  2. Under Headphone connection, choose Flat 2-pin (0.78 mm).
  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.
  • Aspire 1–4 take IPX, not 2-pin.
  • For a 64 Audio custom, look at the socket: two pin holes means 2-pin (choose Flat 2-pin (0.78 mm)); a single round snap-in socket means IPX (choose IPX).

Questions

Common questions

Do you make cables for 64 Audio custom IEMs?

Yes. 64 Audio customs come with an IPX or a 2-pin socket. Choose IPX for an IPX socket, or Flat 2-pin (0.78 mm) for a 2-pin socket. If you are not sure which you have, send us a photo before ordering.

Which plug fits the Aspire series?

IPX. Aspire 1, 2, 3 and 4 have IPX (T2) sockets, unlike the other 64 Audio universals, which take Flat 2-pin (0.78 mm).

Does the apex module matter for the cable?

No. The apex module sits in the earpiece shell; it does not change the cable connector.

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.

 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.

 Noble, UM, FiR, Softears, Symphonium, Elysian

Most: Standard 2-pin. Elysian: FlexiPlug.

 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.
Interconnect cables

XLR, RCA, 3.5 mm, 4.4 mm and USB, 10 cm to 2 m.

 Visit our Singapore studio

76 Playfair Road. Auditions, ear impressions, pickup.

 Sony Walkman

WM1, ZX, DMP-Z1: 4.4 mm. A series: 3.5 mm.

 AKG N40 / N5005 / K712

N40, N5005: IE300/600/900. K712, K702, K371: Mini XLR 3PIN.

 4.4 mm balanced vs 3.5 mm

Is balanced worth it? Power, output impedance and when it matters.

 Best cables for Sennheiser IE 600

Our picks for IE 600, IE 300 and IE 900.

 Best IEM cables under $100 / $200

Our picks, and every cable in each band compared.

 2-pin vs MMCX vs IPX

How they compare in use, what wears and how to tell them apart.

Sources

Sources

  1. 64 Audio — U12t 0.78 mm 2-pin. Accessed 17 Oct 2026.
  2. 64 Audio — U18t Accessed 17 Oct 2026.
  3. 64 Audio — custom designer Socket type IPX or 2-PIN on current customs.
  4. Audio Solace — tia Fourté and U18t review Flush 2-pin sockets.
  5. Null Audio configurator, Headphone connection Options offered on each cable. Snapshot 16 Oct 2026.

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