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

Compatibility guide

Etymotic ER4SR, ER4XR and ER4 replacement and upgrade cables

Replacement and upgrade cables for Etymotic ER4SR, ER4XR and older ER4, handmade to order in Singapore from USD 49 and shipped worldwide with FedEx (free from USD 250).

For the ER4SR and ER4XR, choose ER4SR/XR. Etymotic describes their connector as a customised MMCX with a locating tab, so a standard MMCX plug is not the right choice. For the older ER4P, ER4B and ER4S, choose ER4P/B/S.

Cables

Cables you can order with this connector

Each cable below offers ER4SR/XR under Headphone connection. Prices start from the base configuration; the connector and plug you choose can change the price.

Lune Series MKIX Premium Upgrade Cable for Headphone | IEM

Headphone connection: ER4SR/XR

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

Headphone connection: ER4SR/XR

 From ¥1,354.00 Arete Series MKVI Premium Upgrade Cable for Headphone | IEM

Headphone connection: ER4SR/XR

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

Headphone connection: ER4SR/XR

 From ¥2,715.00 Brevity Pro 5N CGOCC-A Copper Earphone Cable

Headphone connection: ER4SR/XR

 From ¥334.00 Ethos Ultra Coaxial Upgrade Cable for IEM | Headphone

Headphone connection: ER4SR/XR

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

Headphone connection: ER4SR/XR

 From ¥2,034.00 Aoraki MKIV Gold Silver Tri-Hybrid Headphone/IEM Cable

Headphone connection: ER4SR/XR

 From ¥4,755.00 Nyx3 Wireless IEM Cable · Qualcomm QCC5181

Headphone connection: ER4SR/XR

 From ¥606.00 Epsilon 5 Pro 6N UP-OCC Copper Headphone & IEM Cable

Headphone connection: ER4SR/XR

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

Headphone connection: ER4SR/XR

 From ¥7,476.00 Vanda 7N UP-OCC Cryo Copper Headphone/IEM Cable

Headphone connection: ER4SR/XR

 From ¥1,694.00 Ethos MKVII Silver-Plated Copper IEM Cable

Headphone connection: ER4SR/XR

 From ¥606.00

Quick facts

Connection

ER4SR/XR socket

Customised MMCX with a tab that aligns with a slot on the earpiece body

ManufacturerEtymotic ER4SR/ER4XR FAQ (2016, reproduced copy)
Shared cable

ER4SR and ER4XR use the same cable

ManufacturerEtymotic ER4SR/ER4XR FAQ (2016, reproduced copy)
Removing the cable

Pull the connector straight out while holding the earpiece body; do not twist

ManufacturerEtymotic ER4SR/ER4XR FAQ (2016, reproduced copy)
ER4P / ER4B / ER4S

Earlier connector, different from the ER4SR/XR; P, B and S cables carry different series resistors

Published reviewHead-Fi ER4 thread
Options to choose

ER4SR/XR or ER4P/B/S

Null Audio configuratorNull Audio configurator, Headphone connection
Resistors in our ER4P/B/S cable

We build in the resistor that matches your ER4P, ER4B or ER4S. The value can be tuned on request.

Null AudioNull Audio

Models

Which option for each model

Etymotic models with a detachable cable.

ER2SE (2019)

Choose ER4SR/XR. Own connector. Reported to take the ER4SR/XR cable. Confirm with us.

To be confirmedhead-fi.org
ER2XR (2019)

Choose ER4SR/XR. Own connector. Reported to take the ER4SR/XR cable. Confirm with us.

To be confirmedhead-fi.org
ER4SR (2016)

Choose ER4SR/XR. Own connector.

Retailer listingavlgear.com
ER4XR (2016)

Choose ER4SR/XR. Own connector.

Retailer listingavlgear.com
ER4P / ER4B / ER4S

Choose ER4P/B/S. Own connector. Resistor matched to P, B or S; can be tuned on request.

Published reviewhead-fi.org

Ordering

How to order

  1. Pick a cable from the list below.
  2. Under Headphone connection, choose ER4SR/XR or ER4P/B/S.
  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

  • ER4SR and ER4XR say so on the earpiece or box. If yours is an ER4P, ER4B, ER4S or ER4PT, it is the older connector.
  • The stock ER4SR/XR cable ends in a 3.5 mm L-shaped plug. Choose 3.5 mm to keep using the same source.

Questions

Common questions

Why not choose standard MMCX?

Etymotic keys the ER4SR/XR socket with a tab, and says other makers’ cables are unlikely to fit.

Can I use one cable on ER4SR and ER4XR?

Yes. Etymotic says both models use the same cable.

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.

 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.

 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. Etymotic ER4SR/ER4XR FAQ (2016), reproduced on hifi.fan Customised MMCX, shared SR/XR cable, removal method.
  2. Etymotic ER4SR/ER4XR replacement cable (retailer) Keyed Etymotic MMCX.
  3. Head-Fi — ER4 thread Legacy connector and resistor differences.
  4. Null Audio configurator, Headphone connection Options offered on each cable. Snapshot 16 Oct 2026.

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