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

Ethos Ultra coaxial IEM cable with 3.5 mm plug, coiled on a dark studio backdrop

Ethos Ultra silver-white cable with interchangeable 3.5 mm, 4.4 mm and USB-C DAC plugs on a light gray studio background

Ethos Ultra cable connected to AAW Z05 IEMs, with USB-C DAC attached and 3.5 mm and 4.4 mm modular plugs shown separately; IEMs shown for illustration

Ethos Ultra braided cable coiled around the screw-locking 3.5 mm player plug

Ethos Ultra detachable player connection: 3.5 mm plug and screw-locking 4-pin socket

Ethos Ultra pre-formed ear guides with 2PIN connectors, blue for left and red for right

Close-up of the Ethos Ultra braid, with the silver-plated shield visible under the clear jacket

Ethos Ultra Coaxial Upgrade Cable for IEM | Headphone

Name: Null Audio
Address: #01-03, LHK2 Building, 76 Playfair Road, Singapore, 367996, SG
Telephone: +65 8731 5476
Price range: $$

¥606.00 CNY

In stock: the 0.78 mm 2-pin version ships in 1–2 working days. Other connectors are built to order.

Ethos Ultra is the coaxial evolution of Ethos: a 5N single-crystal copper signal conductor inside a silver-plated copper shield, with a Kevlar core for strength. The player end is detachable, and 3.5 mm, 4.4 mm balanced and a USB-C DAC plug all come in the box.

Coaxial
5N single-crystal copper
Kevlar core
3.5 · 4.4 · USB-C DAC
35 g

Sound Balanced Detailed & airy Wide stage

Bass8.9Mids9.1Treble8.9Stage9.1Detail8.7

MusicPop & vocals Classical & acoustic

Configure your cable

Choose your earphone connector and options below.

2-pin ships in 1–2 daysIn stock; other connectors about 1 week
14-day returns1.2 m and longer · conditions apply
1-year warrantyOn every cable · then half price for life
Handmade in SingaporeChat and phone support

Downloads

DatasheetPDF · 0.6 MB

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Compatibility

Will it fit my earphones or headphones?

Search your earphone to see which Headphone connection to choose for this cable. Most 2-pin IEMs take our standard 2-pin plug; some models need their own connector.

Find my IEM

Find my headphones

Replacement cable for these earphones

Moondrop Chu 2 · Shure SE215 · Truthear Hexa · KZ ZS10 Pro, ZSN Pro X · Sennheiser IE 200 / IE 300 / IE 600 / IE 900 · Sennheiser IE 40 PRO / IE 400 PRO / IE 500 PRO / IE 80 · Sony IER-Z1R / IER-M9 / IER-M7 / XBA · Etymotic ER4SR / ER4XR / ER4P / ER2 · Shure SE846 / SE535 / SE215 / AONIC · 64 Audio · JH Audio · Westone MACH / Pro X · Ultimate Ears (UE) · Campfire Audio · Audio-Technica · AAW (Advanced AcousticWerkes) · Moondrop · qdc, KZ and CCA · Truthear, Kiwi Ears, Simgot and more · Empire Ears · Vision Ears · Noble, UM, FiR, Softears, Symphonium, Elysian · JOMO Audio · Dunu · FiiO · final

Replacement cable for these headphones

Sennheiser HD 600 / HD 650 · Sennheiser HD 560S / HD 5x9 · Sennheiser HD 800 / HD 800 S · beyerdynamic · HIFIMAN · Audeze · Focal

IEM connectors explained

2-pin, MMCX, IPX, A2DC and FlexiPlug: what each one is.

Choosing the player plug

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

Ethos Ultra

Ethos, rebuilt coaxial.

A 5N single-crystal copper conductor, a silver-plated shield wrapped around it and a Kevlar core at the centre. Three plugs in the box, one cable for every source.

Ethos is the Greek ēthos: character. In Aristotle’s rhetoric it is the trust a speaker earns before saying a word. On stage, a cable earns it the same way, by never being the thing you think about.

Shuāng Jiǎ · Frost-White Armour

35 g Total weight
2.5 mm Per coaxial lead
5N Single-crystal copper signal conductor
384 kHz 32-bit USB-C DAC with parametric EQ

Construction

Coaxial Signal Path

Each channel runs as its own coaxial line. The 5N single-crystal copper conductor carries the signal; the silver-plated copper spiral shield wound around it carries the return and shields the conductor at the same time.

At the very centre, a Kevlar fibre core takes the pulling strain, so the copper isn’t stretched when the cable is tugged, coiled or wound for the road.

Signal and return stay at a fixed, concentric spacing along the whole cable, and each channel keeps its own return, so 4.4 mm balanced is native.

1Outer jacket2.5 mm, clear, yellowing-resistant
2Return (−) + shieldSPC spiral shield, 7 × 19 × 0.06 mm
3InsulationKeeps the spacing concentric
4Signal (+)5N single-crystal copper, 7 × 7 × 0.08 mm
5Kevlar fibre coreTakes the pulling strain

USB-C DAC + Parametric EQ

Tune it once. Hear it everywhere.

The USB-C plug is a complete 32-bit / 384 kHz DAC with a parametric equalizer built in. Shape the sound with the Null Audio PEQ app, write it to the DAC, and your tuning goes with the cable to iPhone and Android alike.

32-bit / 384 kHzHi-res DAC built into the USB-C plug
5-band parametric EQAdjust frequency, gain and Q for each band
Saved on the DACWrite your EQ to the plug and it plays the same on any phone
iPhone and AndroidPlug into a USB-C phone and listen

ConnectPlug the USB-C DAC into your Android phone, or into a computer.
TuneUse the Android app, or open peq.null-audio.com in Chrome or Edge on a computer.
Write to DACSave the EQ to the DAC, then use it with iPhone or Android, no app needed.

Get the Android appScan with your Android phone to download.
peq.null-audio.com

Get the Android app

Tuning needs the Android app, or Chrome or Edge on a computer; iPhone browsers can’t connect to the DAC. Once written to the DAC, your EQ plays on iPhone too.

Try the EQ

Filter

Frequency

Gain

A simulation of the DAC’s 5-band parametric EQ, with the same filter types and limits. Set it for real in the PEQ app, then write it to the DAC. Open the PEQ app →

Finish

Silver Under Glass

Through the clear outer jacket you can see the silver-plated spiral shield that carries the return. Below the split, the coaxial leads are braided together.

Player Connection

One Cable, Every Source

The player end is detachable. A threaded, screw-locking connector swaps between 3.5 mm single-ended, 4.4 mm balanced and USB-C, all included.

The USB-C plug is a complete DAC with its own parametric EQ; try the EQ further up this page.

Fit

Shaped for the Ear

Pre-formed ear guides keep the cable in place on stage and on the move. Colour rings mark each side: blue for left, red for right.

Shown with AAW Z05 in-ear monitors, which are not included.

Sound Guide

Single-crystal copper adds weight and body to the mids and bass. The silver-plated shield keeps the treble open. Coaxial shielding lowers the noise floor for cleaner imaging and detail.

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

Ethos Ultra
Ethos MKVII (SPC)

Treble 8.9 / 8.7 out of 10 (Ethos MKVII (SPC) 8.7)
Mid 9.1 / 8.7 out of 10 (Ethos MKVII (SPC) 8.7)
Bass 8.9 / 8.5 out of 10 (Ethos MKVII (SPC) 8.5)
Bass Depth 8.9 / 8.4 out of 10 (Ethos MKVII (SPC) 8.4)
Imaging 9.1 / 8.5 out of 10 (Ethos MKVII (SPC) 8.5)
Headroom 8.9 / 8.5 out of 10 (Ethos MKVII (SPC) 8.5)
Detail Retrieval 8.7 / 8.4 out of 10 (Ethos MKVII (SPC) 8.4)

Compare

Ethos Ultra vs Ethos MKVII

Ethos MKVII, the all-SPC braided classic, is still available. Most reviews on this page were written for MKVI.

See Ethos MKVII

Ethos Ultra vs Ethos MKVII
Feature	Ethos Ultra	Ethos MKVII
Construction	Coaxial, one line per channel	Braided, 116 threads per braid
Signal conductor	5N single-crystal copper, 7 × 7 × 0.08 mm	Silver-plated copper, UPOCC cast
Return / shielding	Silver-plated copper spiral shield around each signal line	Braided SPC full-jacket RF shielding
Gauge	≈23 AWG signal, ≈0.38 mm² return	21.5 AWG
Strength member	Kevlar fibre core	—
Player end	Detachable: 3.5 mm, 4.4 mm and USB-C DAC included	One plug, chosen when ordering
USB-C DAC + PEQ	32-bit / 384 kHz, EQ written to the DAC	—
Weight	≈35 g	≈26 g
Hardware	CNC aluminium, PVD gunmetal grey	Black / rose gold
Length	1.2 m	1.2 m

In the box

One cable, three ways to play

Ethos Ultra cable 1.2 m, your connector
3.5 mm single-ended plug Screw-locking
4.4 mm balanced plug Screw-locking
USB-C DAC plug 32-bit / 384 kHz, PEQ
Premium leather pouch For daily carry

Craft and care

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 Ear and QDC 2PIN.

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.

Oxidation and Anti-Yellowing

Stays Bright, Stays Clear

Bare copper and silver plating darken as they oxidise, and many clear cable jackets turn yellow with age. Ethos Ultra is built to avoid both.

Every strand is individually enamelled and sealed under an ultra-flexible PVC coating, so air and moisture never reach the metal and the conductor keeps its original colour. The silver-plated spiral shield around each signal line, 19 bundles of 7 fine wires wound in one direction, adds abrasion resistance, strength and flexibility.

The clear outer jacket is yellowing-resistant, so the silver shield underneath stays on show instead of fading behind a tinted sleeve.

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.

To swap the player plug, unscrew the locking collar fully, then pull the plug straight out.

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

Construction: Coaxial, one line per channel
Signal (+): 5N single-crystal copper, 7 × 7 × 0.08 mm (≈0.25 mm², ≈23 AWG)
Return (−) / shield: Silver-plated copper spiral shield, 7 × 19 × 0.06 mm (≈0.38 mm²)
Strength member: Kevlar fibre core
Protection: Individually enamelled strands under PVC coating; yellowing-resistant clear jacket
Outer diameter: 2.5 mm per lead
Length: 1.2 m / 48 in (custom on request)
Weight: ≈35 g

Connectors

Player plugs: 3.5 mm single-ended, 4.4 mm balanced, USB-C DAC; interchangeable, screw-locking
Earphone connector: Chosen in the configurator; FlexiPlug available
Hardware: CNC aluminium, PVD gunmetal grey
Pin contact: High-precision, 24k gold plated
Solder: NA custom 10% silver solder

USB-C DAC

DAC chip: KTMicro KT02H20 single-chip USB audio codec
Formats: PCM up to 32-bit / 384 kHz; DSD64 and DSD128
Dynamic range: 115 dB (chip specification)
THD: −85 dB (chip specification)
Headphone amplifier: Built-in Class G; drives 16 Ω earphones directly, no output coupling capacitor
Parametric EQ: 5 bands: peak, low/high shelf, low/high pass; 20 Hz–20 kHz, ±12 dB, Q 0.2–60; saved in the DAC
Tuning: Android app, or peq.null-audio.com in Chrome or Edge on a computer
USB: USB Audio Class 1.0 / 2.0, no driver needed
Works with: USB-C iPhone (iPhone 15 and later), iPad and Android phones; Windows, macOS and Linux computers

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

Service

Warranty: 1 year
Returns: Any build from the options on this page, 1.2 m or longer: 14 days from delivery, unused and in original packaging; 30% restocking fee on returns, none on exchanges; shipping not refunded. Inline-mic builds and cables under 1.2 m are not returnable. Defects are covered by the warranty.
Made in: Singapore; 0.78 mm 2-pin in stock, other connectors built to order

Find the right connector for your earphones

Reviews below include earlier Ethos generations (Ethos Series MKVI and before).

Customer reviews

Rated 4.6 out of 5 from 228 reviews.

5 stars: 181 (79%)
4 stars: 26 (11%)
3 stars: 5 (2%)
2 stars: 9 (4%)
1 star: 7 (3%)

Love it at the sight and loving its performance

Superb in, Stunning out cables. This is my first NA Cable, outstanding effects on my AK Zero1: wider sound stage, more details, tight bass and sparkly treble, forward mid a bit. The weekness on my Zero1 is the quite tight soundstage but Ethos MKVI solved the problem wisely.
The metal part (Black/Silver) is match perfectly with my AK SR25mkii n' Zero1!
The leather case is well made as well.
The service center (dont know exactly who) is very kind and helpful, served my requesting in deep.

Can't not wait to try more iem cable from Null Audio soon!

Ethos Series MKVI Premium Cable for IE900

Beautiful cable. Support where very helpful as I wanted a custom 140cm cable for desk use. Beautiful sound & build quality. Highly recommend.

Absolute fabulous!

Visually stunning and sounded fantastic with the additions of a miniature DAC built within the USB C connector. I absolute enjoyed listening to the clear reproduction and it works on both my phone and the PC. Awesome product!

Great Cable for IE 600

Great sounding and looking cable for the Sennheiser IE 600. Had some issues with my original order, but great customer service handled it perfectly. Very happy with the cable. More secure than the original stock cable, with less microphonics and memory. Very happy with my purchase at Null.

Comfortable, nice cable!

Great for ie600!

THE best IE 600 cable

Huge fan of this cable, wanted an upgrade from the 'meh' stock cable of the Sennheiser IE 600 and I am super pleased with this one. Very low memory, super soft, no microphonics and it looks amazing. Highly recommend!!

Best Neutral Cable so far

I have been Null Audio user since early 2000s. Then recently I noticed Null still makes cables. Out of whim I tried this cable for my IEM, and I was blown away by transparency this cable could deliver.
I have over 100 cables including PW Audio Copper M2 , Ignis, Legend II, Copper 28V2, Many NiceHCK (including flagship Dragonscale), XINHS, and many other cables.
Eyhos MKV is truly highly recommendable cable among them all when considered price to performance.

Nice cable, but no customer service for fitment issue.

I’ve contacted Null through email twice. Never heard anything back. I received the cable and loved everything about it.. until I noticed the ear hooks were slightly different sizes. So now the cable falls off one of my ears, and it’s secure on the other one. Very frustrating and it makes me not want to even use the cable. I would have done 1 star, but I decided to do 2 because of the quality materials and the nice MMCX fitment on my IE600. I really want to like it, but the ear hooks just don’t work unfortunately.

Perfect replacement of original cables for Senn IE600

Sounds great! But I wish next time engineers take more care of Right and Left input. Right and left channel were switched in my cables. It is not uncomfortable since I can just change the left one to right earbud, but I could be better if I got rightly tuned one.

Ethos MKIV Premium Upgrade Cable review

Awesome cable for my Sennheiser Ie900. Got the look, build, and sound. Very impressed with the packaging and build for the price I paid. Highly Recommended!

There is a contact failure on ie300.

No proper action for more than a month.

This is the totally amazing experience

I didn't expect this kind of huge sound change for using custom cable.
It is amazing and i fell in love with sound.
Thank you.

Better than I’d imagined

I’ve never been one to think audio cables affected sound. I use UE Capitol Recordings in ear monitors and I’d always thought they had some low midrange problems. I used their upgraded cable and it still felt muddy.

I got them because I’m a mix engineer and I use them to mix live shows and records.

I didn’t realize it was the cable. The new one I purchased here made them TOTALLY flat, the way they’re supposed to be. I hadn’t actually heard them properly.

The new cable DOES require more voltage, so it will drain a phone a bit faster, but the quality of sound, style and build quality far exceeds the reasonable price.

I tell everyone I know to buy these now. In my professional opinion.

Electrical Leakage

Bought this last year to replace the worn cables on my IEMs. They do their job well enough and as good as the original cables on my earpieces. But they do have one major caveat - electrical leakage when my Macbook Pro is plugged in to charge. I've waited this long to post a review because I didn't believe that cables at this price point would have an issue like this, and I've tested this with 2 other chargers, one of which I purchased brand new. I used to think it was my imagination, but the sharp, nagging sting at the top of my ears where the metal casing rests gets unbearable, and a test pen has confirmed my suspicions as well. It has come to the point where I have stopped using that set of IEMs when I need to charge my computer. If your work requires you to have your laptop or other electronic devices constantly plugged in while you are monitoring, I would definitely avoid.

This cable is amazing

It's the cheapest cable inbthe NA line up, yet I found I like it the most among all other models!My first impression is that this is a beautifully built cable, when I link it up with VE8, I was immediately shocked by the huge soundstage, and the bass is very prominent. Yet, the vocals is still very clear and transparent ! I got some more expensive cables from NA before,but I really think this is the best cables for my IEMs.

Great Cable c/w Mic

Good upgrade cable beautiful and good quality

Enhance high-resolution reproduction

Ordered the ETHOS PLUS with A2DC connectors and In-line mic/volume control to replace my original cable of my Audio-Technica ATH-CKR90iS.
I love this upgrade as it improve the mids of my old IEM.

Ethos Plus - I like it!

Purchased to go with my Massdrop Plus IEM. Specifically looking for a cable to wear under my Motorcycle helmet. I own and love the Arete cable but that was too thick to wear over the ears under the helmet. The Ethos works great. Both cables are well built, do not tangle easily (Important to me!), and sound fine. I'm no expert at detecting sound signature changes based on cables so I won't make any claims on that. However the cables work great and I'm happy with my purchase.

Ethos 5N CGOCC

I'm pairing this cable with the Audio Technica CKS1100. Overall I would say that the sound has definitely improved.

Bass doesn't sound that bloated anymore, and more punchy in fact. Though those who enjoys sub bass might want to take note that the cable does reduce that frequency spectrum.

Resolution is much better with an obvious increase in clarity especially when it comes to vocals. Hearing these improvements made it apparent to me that the default cable on the CKS1100 really is holding back the potential of the earphone.

With all these increase in sound quality some of you might wonder: Why is this cable only getting 4 stars?

Since I had requested the cable without earguides at the connectors, Null Audio had kindly replaced the connectors with metallic ones. And that is when I experienced something that has never happened to me throughout years of earphones using. After replacing my earphone cable with the Ethos, whenever I use it with a charging device (Laptops, Phones etc.), I will constantly get small electric shocks at my ears. This issue doesn't occur as long as the device isn't charging.

It made me realise why nearly all earphone cable connectors have a rubber or plastic exterior.

The cable is beautiful, improves on sound quality and seems to be well built. So I hope Null Audio will take note about the metal connector issue to improve on the good job they are already doing.

Very great quality !

Very great quality !

Noticeable Improvement on other cables

I've used 5+ different cables with my ER4s and this is the first cable where I felt like I could hear a clear improvement in the sound quality and clarity. Difficult to quantify, but definitely a worthwhile upgrade.

Questions

Good to know

How long until it ships?

The 0.78 mm 2-pin version is in stock and ships in 1–2 working days. Other connectors are built to order by hand in Singapore, with a lead time of around 1 week.

Will it fit my earphones?

Choose your earphone connector in the configurator above. FlexiPlug lets you switch between 2PIN, IE300, A2DC, IPX, Pentaconn Ear 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 change the player plug later?

Yes. The player end is detachable with a threaded, screw-locking connector, and the 3.5 mm, 4.4 mm balanced and USB-C plugs are all included.

Guide to player plugs

What does the USB-C plug do?

It is a complete 32-bit / 384 kHz DAC with parametric EQ. Tune it with the Android app, or at peq.null-audio.com in Chrome or Edge on a computer, then write the EQ to the DAC.

Can the USB-C DAC drive my earphones?

It is made for in-ear monitors. Its built-in Class G amplifier drives earphones from 16 Ω directly, with no output coupling capacitor. For full-size or hard-to-drive headphones, use the 3.5 mm or 4.4 mm plug with a dedicated amplifier.

Does it work with iPhone?

Yes. Plug the USB-C DAC into a USB-C iPhone and listen. iPhone browsers can’t connect to the DAC for tuning, so set your EQ once with the Android app or a computer and write it to the DAC; it then plays the same on iPhone.

Can I get a different length?

Yes. Contact us or WhatsApp +65-8731-5476 for custom builds.

Will the cable turn green or yellow over time?

It’s built not to. Every strand is individually enamelled and sealed under a PVC coating, which protects the copper and silver plating from oxidation and colour change, and the clear outer jacket is yellowing-resistant.

What is the return policy?

Any build you choose from the options on this page, at 1.2 m or longer, can be returned or exchanged within 14 days of confirmed delivery if unused and in its original packaging. Returns carry a 30% restocking fee and exchanges none; shipping is not refunded.

Cables with an inline microphone and cables shorter than 1.2 m cannot be returned or exchanged for a change of mind. 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

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