Philips Fidelio X3 cable, Nylith Nylon 5N Copper by Null Audio

Nylith Y-split with the NA mark and Nylith nameplate, on black nylon-sleeved cable

Philips Fidelio X3 Cable (Dual 3.5 mm) · Nylith Nylon 5N Copper

₩81,000 KRW

Nylith, built for the Philips Fidelio X3: 5N UP-OCC copper, 60 strands per conductor, 24 AWG, hand-sleeved in soft black nylon, as Standard or Braided. It weighs 35 g at the standard 1.5 m.

5N UP-OCC copper
60 strands per conductor
24 AWG
Hand-sleeved nylon
Standard or braided
35 g
Full-size headphones

Sound Warm & full Bass boost Vocal boost

Bass9.1Mids9.1Treble8.5Stage8.5Detail8.4

MusicPop & vocals Rock & metal Jazz & R&B

Fits these headphones

Fidelio X3

Also for these headphones

Lune MKIX ₩278,000

Configure your cable

Your headphone plug is fitted. Choose Standard or Braided, the player plug and length 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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Nylith, built for the Philips Fidelio X3: 5N UP-OCC copper, 60 strands per conductor, 24 AWG, hand-sleeved in soft black nylon, as Standard or Braided. It weighs 35 g at the standard 1.5 m.

Fits these headphones

Fidelio X3

Headphone plug: Dual 3.5 mm (one plug per cup), included in the price. Not your model? Ask us: we cable most headphones on request. The headphone cable finder lists the plug on 489 headphones.

Fit guarantee

If the cable doesn't fit the headphones you chose, tell us within 30 days of delivery and we'll make a new one free, shipping included.

Compatibility

Will it fit my headphones?

This cable comes with the plug for the headphones listed above already fitted at the cups. Not sure which plug yours take? The headphone cable finder lists the connector on 489 headphones.

Find my headphones

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

Choosing the player plug

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

Nylith

Woven to be forgotten.

The name joins nylon to -lith, the Greek for stone: a woven skin that feels like fabric, over a core of fine-drawn copper. Nylith is made for full-size headphones and the desk they live on, and at 35 g it is the last thing you notice.

5N UP-OCC copper purity
60 Strands per conductor
24 AWG Per conductor
35 g Cable weight

Construction

5N UP-OCC Copper

Each conductor is 5N (99.999%) UP-OCC copper. Ohno continuous casting draws the copper into long, continuous crystals, so the signal crosses fewer grain boundaries along the way.

Sixty strands of that copper make up each conductor, for 24 AWG.

Sleeve

Nylon You Can Feel

Nylith is sleeved by hand in black nylon multifilament, close-woven and soft to the touch. It drapes like fabric rather than springing back like rubber, and the black stays looking clean on the desk.

The Standard build wears a 4 mm sleeve on the main run and 2.4 mm on each leg after the Y-split. The Braided build takes two 2.4 mm nylon-sleeved leads and braids them from end to end, for USD 10 more.

Detail

Signed at the Split

The Y-split carries a pierced nameplate: the NA mark and the Nylith name side by side, with Null Audio along its edge.

Length

Made for the Desk

Nylith comes at 1.5 m as standard, an easy reach from your headphones to an amp or DAC on the desk. Set any length from 50 cm to 3 m in the configurator.

Sound Guide

Nylith is copper through and through: warm, with full mids and bass that has body. The treble is smooth rather than bright, so long sessions stay easy.

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

Nylith
Lune

Treble 8.5 / 9.1 out of 10 (Lune 9.1)
Mid 9.1 / 9.3 out of 10 (Lune 9.3)
Bass 9.1 / 8.7 out of 10 (Lune 8.7)
Bass Depth 8.9 / 8.5 out of 10 (Lune 8.5)
Imaging 8.5 / 9.6 out of 10 (Lune 9.6)
Headroom 8.7 / 9.5 out of 10 (Lune 9.5)
Detail Retrieval 8.4 / 9.1 out of 10 (Lune 9.1)

In the box

Ready to plug in

Nylith cable Standard or Braided; your length and player plug
Premium leather pouch For daily carry

Craft and care

Build Note

Designed, handcrafted and shipped from Singapore.

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

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: 5N UP-OCC copper
Construction: 60 strands per conductor
Gauge: 24 AWG per conductor
Sleeve: Black nylon multifilament, sleeved by hand
Build: Standard: 4 mm main run, 2.4 mm legs. Braided (+USD 10): two 2.4 mm leads braided end to end
Weight: 35 g (1.5 m, Standard build)
Length: 1.5 m standard; any length from 50 cm to 3 m in 2 cm steps in the configurator

Connectors

Headphone connector: Fitted for the headphones named on this page (see "Fits these headphones")
Player plug: NL4 Blue 3.5 mm, 3.5 mm balanced or 4.4 mm, or a 6.35 mm plug, included in the price; 4-pin XLR +USD 10

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 plug your headphones take

Questions

Good to know

How long until it ships?

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

What if it doesn’t fit my headphones?

The plug is matched to the headphones listed on this page. If the cable doesn’t fit the headphones you chose, tell us within 30 days of delivery and we’ll make a new one free, shipping included.

Check your headphone’s plug

What does USD 59 include?

A 1.5 m Nylith with your headphone connector and a 3.5 mm, 4.4 mm or 6.35 mm player plug. The Braided build adds USD 10, LEMO and Dan Clark connectors add USD 50, and a longer cable costs more; the configurator shows the price before you add to cart.

Standard or Braided?

Both use the same copper and the same black nylon. Standard has a 4 mm sleeve on the main run and 2.4 mm on each leg after the Y-split; it is the lighter and softer of the two. Braided twists two 2.4 mm nylon-sleeved leads together from end to end, for a round, plaited look all the way along. Braided costs USD 10 more.

What is UP-OCC copper?

UP-OCC is copper made by Ohno continuous casting, which draws it into long, continuous crystals instead of many small grains. The signal crosses fewer grain boundaries along the way. Nylith uses 5N (99.999%) UP-OCC copper.

How is a Nylith conductor built?

Each conductor is 60 strands of 5N UP-OCC copper, for 24 AWG.

Can I get a different length?

Yes. Choose Cable length in the configurator above: set any length from 50 cm to 3 m in 2 cm steps. Up to the standard 1.5 m costs nothing extra; longer cables cost more, and the price is shown before you add to cart.

For a length over 3 m, contact us or WhatsApp +65-8731-5476.

Does Nylith work with in-ear monitors?

No. Nylith is made for full-size headphones only, with no in-ear monitor connectors.

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