Free worldwide shipping over USD 250 Handmade in Singapore since 2008 Fits 400+ IEMs

Epsilon MKIII Premium Upgrade Cable for Headphone | IEM

Epsilon is a UPOCC copper upgrade cable for headphones and IEMs, with 126 strands per wire and 504 per cable in a Litz 5 configuration. Tuned by AAW engineers for sensitive IEMs, it brings clarity across the spectrum, a rich mid-range and textured bass, in a...

  • UPOCC copper
  • Litz 5
  • 504 strands
  • 23 AWG
  • Tuned with AAW
Bass9.1Mids9.3Treble8.9Stage8.9Detail8.9
Configure your cable

Choose your earphone connector and options below.

  • Built to orderShips in about 1 week
  • 14-day returnsStandard builds · conditions apply
  • 1-year warrantyOn every cable
  • Handmade in SingaporeChat and phone support

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The late boomer.

Epsilon

The late boomer.

UPOCC copper in a Litz 5 configuration, with clarity across the spectrum, a rich mid-range and textured bass. Tuned by AAW engineers.

  • 504 Strands per cable, Litz 5
  • 126 Strands per wire
  • 23 AWG Wire gauge
  • 24 g Weight
Litz 5 UPOCC Copper

Construction

Litz 5 UPOCC Copper

Copper conductors in UPOCC cast, 126 strands per wire and 504 strands per cable in a Litz 5 configuration, for low resistance and unimpeded signal transmission.

The result is clarity across the spectrum, a rich mid-range and textured bass.

IEM Matching

Tuned with AAW

Precision-tuned by AAW engineers for sensitive IEMs, for a cohesive, synergistic sound with minimal phase distortion. It carries the AAW badge.

Stage and Street

Stage and Street

A lightweight build with a sleek black insulating sleeve, at home on stage and in daily use.

Epsilon is a UPOCC copper upgrade cable for headphones and IEMs, with 126 strands per wire and 504 per cable in a Litz 5 configuration. Tuned by AAW engineers for sensitive IEMs, it brings clarity across the spectrum, a rich mid-range and textured bass, in a lightweight, yellowing-resistant black sleeve.

Sound Guide

How Epsilon rates for treble, mids, bass, bass depth, imaging, headroom and detail retrieval. Use it to match the cable to your earphones and source.

Ratings are Null Audio’s listening notes, out of 10.

  1. Treble 8.9 out of 10
  2. Mid 9.3 out of 10
  3. Bass 9.1 out of 10
  4. Bass Depth 8.9 out of 10
  5. Imaging 8.9 out of 10
  6. Headroom 9.1 out of 10
  7. Detail Retrieval 8.9 out of 10
Ready for daily carry

In the box

Ready for daily carry

  • Epsilon cable Your length and connector
  • Premium leather pouch For daily carry

Craft and care

Introducing FlexiPlug

Introducing FlexiPlug

The FlexiPlug is a multi-connection system, enabling users to switch to adequate connectors for their IEMs.

Currently supporting 2PIN, IE300, A2DC, IPX, Pentaconn Ears and QDC 2PIN.

Build Note

Build Note

Designed, handcrafted and shipped from Singapore.

Built-to-order. Lead time around 1 week.

Ear guide (~10cm) is installed by default for commonly used IEM connectors (e.g. 2PIN, MMCX, IPX). Let us know if your IEM/headphone is modified or needs extra customization.

Anti-Yellowing

Made to Last

Epsilon’s black insulating sleeve is made for prolonged durability and resists yellowing, so the cable keeps its look on stage and in daily use.

Caring for Your Cable

Care

Caring for Your Cable

Coil it loosely in large loops and keep it in the included leather pouch when you’re on the move.

Unplug by holding the connector, not the cable, and avoid sharp bends right at the plugs.

Wipe it with a soft, dry cloth, and keep it away from solvents and alcohol-based cleaners.

Every cable has a 1-year warranty. If anything goes wrong, contact us and we’ll take care of it.

Specifications

Technical details

Cable
Conductor Material
UPOCC Copper
Wiring
23 AWG
Length
1.2 m standard; 1.5, 1.8, 2.0, 2.5 or 3.0 m in the configurator
Weight
~24g
Connector Color
Gunmetal (NL5 hardware)
Solder
WBT Silver Solder
Pin contact
High precision fabrication, 24k gold plated
Protection
Black insulating sleeve, yellowing-resistant
Compatibility
Earphone and headphone connectors
FlexiPlug (switchable 2-pin, IE300, A2DC, IPX, Pentaconn Ear, QDC 2-pin), 2-pin 0.78 mm, Flat 2-pin 0.78 mm, MMCX, A2DC, IPX, A2DC (headphones), Etymotic ER4P / ER4B / ER4S, Etymotic ER4SR / ER4XR, FitEar, JH Audio (with bass control), Sony IER-Z1R, Sony MDR-EX1000, Sony XBA-A / XBA-Z series, Ultimate Ears TripleFi 10, UE / UM / QDC legacy 2-pin, KZ C-pin 0.75 mm 2-pin, KZ / 64 Audio 0.75 mm flat 2-pin, Beyerdynamic T1 / T5p, Focal Utopia, Sennheiser IE 40 PRO, Sennheiser IE 8 / IE 80, Sennheiser IE 300 / IE 600 / IE 900, Sennheiser IE 500 PRO, Sennheiser HD 59X, Sennheiser HD 600 / HD 650, Sennheiser HD 700, Sennheiser HD 800, Mini XLR 3-pin, Mini XLR 4-pin, Shure SRH1540 / SRH1840
Player plugs
2.5 mm balanced, 3.5 mm, 3.5 mm right-angle, 3.5 mm balanced, 4.4 mm balanced, 3-pin XLR (pair), 4-pin XLR, Lightning DAC, USB-C DAC (Realtek ALC5686), USB-C DAC (ESS ES9280C)
Service
Warranty
1 year
Returns
Standard builds: 14 days from delivery, unused and in original packaging; 30% restocking fee, shipping not refunded. Custom spec, length or connector builds: no change-of-mind returns once production starts. Defects are covered by the warranty.
Made in
Singapore, built to order

Find the right connector for your earphones

Customer reviews

Rated 4.9 out of 5 from 40 reviews.

  • 5 out of 5 · A**x · 2026-03-24

    Good Upgrade Cable for IE600

    I purchased this cable to replace stock IE600 cable. It is a cable with better built quality compared to the stock one. Sound clarity improve by a bit.

  • 5 out of 5 · Low · 2025-12-29

    Quality Cable

    Love the weight and thickness of the cable. Improved the sound quality as well—fantastic customer service, responsive and accommodating. Area to improve - punch. Too small. Can't fit my IEM.

  • 5 out of 5 · Darren · 2025-12-16

    Great Quality

    Great quality upgrade to my stock cables, feels and look great, and incredibly quick shipping!

  • 5 out of 5 · Michael Y. · 2025-06-01

    Amazing Quality

    I've been using this cable for over a month and I'm happy with my purchase

  • 5 out of 5 · K. Z. · 2025-05-19

    Nice upgrade for my Z06

    Compared to stock cable of Z06, the 8-wire version of Epsilon gives a good upgrade while not changing the original sound signature.

  • 5 out of 5 · Ivan · 2024-12-08

    Incredible Cable

    I have cables that cost several hundreds of dollars and they pale in comparison to this. It is incredibly well made. Shipping was fast, too. Null Audio is going to be one of my go-to cable manufacturers going forward.

Questions

Good to know

How long until it ships?

Every Epsilon is built to order by hand in Singapore. Lead time is around 1 week.

Will it fit my earphones?

Choose your connector when you order. FlexiPlug lets you switch between 2PIN, IE300, A2DC, IPX, Pentaconn Ears and QDC 2PIN. If your earphones are modified or need a custom fit, contact us before ordering.

Find the right connector for your earphones

Can I get a different length?

Yes. Choose Cable length in the configurator above: 1.2 m is standard, and 1.5, 1.8, 2.0, 2.5 and 3.0 m are available at an extra cost, shown before you add to cart.

For any other length, contact us or WhatsApp +65-8731-5476.

Will the sleeve turn yellow over time?

Epsilon’s black insulating sleeve is made for prolonged durability and yellowing resistance.

What is the return policy?

Standard builds can be returned within 14 days of confirmed delivery if unused and in their original packaging. Change-of-mind returns carry a 30% restocking fee, and shipping is not refunded.

Custom spec, length or connector builds cannot be returned for a change of mind once production starts. Faults are a different matter: every cable has a 1-year warranty, so contact support@null-audio.com and we will assess it.

Read the full return policy