Cardas · Headphone Cables

Cardas HPI Headphone Interconnect

From $20

Cardas · Headphone Cables

The original portable-audio upgrade cable: a short 3.5 mm to 3.5 mm interconnect in Cardas copper for a DAP, phone or laptop feeding a portable amplifier or DAC.

Price is for one cable at the shorter length. Choose 15 cm or 30 cm in the selector.

3 conductors
2 × 25.5 AWG + 1 × 23.5 AWG
Shielded
twisted triad
3.1 mm
outside diameter
15 / 30 cm
lengths
Options and pricing

Authorized Cardas dealer · Delivery and installation by Pearl Audio · Trade-ins welcome

The story

Headphone Interconnects (HPI) bring Cardas sound to compact portable systems. Two 25.5 AWG and one 23.5 AWG Cardas Litz conductors with Golden Ratio stranding and PFA insulation form a shielded twisted triad bound in FEP tape with cotton fillers, under a PVC jacket just 3.1 mm across.

The standard termination is 3.5 mm stereo to 3.5 mm stereo, in 6 in (15 cm) and 1 ft (30 cm) lengths, hand terminated in Bandon, Oregon.

6 in (15 cm) suits a source strapped to a portable amplifier; 1 ft (30 cm) gives room for the two to sit side by side. For a 3.5 mm to RCA connection into a hi-fi system, see the Cardas iLink.

Key technologies

  • Ultra Pure Cardas Copper. Grade 1, 99.9999% pure oxygen-free copper, drawn and annealed slowly through silver dies, then given a single poly-nylon coat to prevent oxidation and crosstalk between strands.
  • Golden Ratio scaled Litz conductors. Multi-stranded conductors in which each layer of strands steps up in size by 1:1.618 from the centre outward, a Cardas patent that controls strand resonance.
  • Shielded twisted triad. Three conductors bound in FEP tape with cotton fillers, shielded, under a slim PVC jacket.
  • Made in Bandon, Oregon. Every Cardas cable is built and hand terminated at the Cardas factory on the southern Oregon coast and carries the Cardas lifetime cable warranty.
Specifications
Type 3.5 mm to 3.5 mm interconnect
Conductors 2 × 25.5 AWG + 1 × 23.5 AWG Grade 1, 99.9999% OFC Litz, Golden Ratio stranding, PFA insulation
Geometry Shielded twisted triad bound in FEP tape with cotton fillers
Jacket PVC
Outside diameter 0.122 in (3.1 mm)
Terminations 3.5 mm stereo to 3.5 mm stereo
Lengths 6 in (0.15 m) or 1 ft (0.3 m)
Sold as Single cable
Warranty Cardas lifetime cable warranty
Made in Bandon, Oregon, USA

Cardas HPI Headphone Interconnect product page and specifications Specifications from cardas.com and the Cardas 2025 Dealer Catalog (Spring 2025 Retail). Lengths are metric; Cardas builds any length to order.

Where it sits in the range

Cardas headphone cables run from Parsec to Clear Beyond, all built to order with the amplifier plug and headphone connectors you specify.

Plan your Cardas system with Pearl Audio

Pearl Audio is an authorized Cardas dealer. We can confirm the connectors your headphones and amplifier need, order custom lengths and terminations, and let you hear Cardas cabling in our Portland showroom by appointment. Call (503) 222-2599 or email sales@pearlaudio.com.

The Pearl Audio experience

How we work with you

A system at this level should be heard, thoughtfully matched, and properly set up. From the first audition to long-term ownership, you work with the same people, in person.

  1. 01

    Listen first

    Hear the HPI Headphone Interconnect by appointment in one of our two purpose-designed demonstration rooms, with your own music and time to compare without pressure.

  2. 02

    Delivery and installation

    We deliver and install throughout the Portland area, taking care of placement, connections, ventilation and system configuration ourselves.

  3. 03

    Support for as long as you own it

    We support everything we sell for as long as you own it, whether the answer comes by phone, in your home, or through factory service.

  4. 04

    A path for what comes next

    Trade-in assistance and qualifying 100% Trade-Up options give you flexibility when your listening priorities or your system change.

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