Supra HDMI-HDMI 2.1 UHD8K 2m cable

Twenty years after launching its first HDMI cable in 2004, Swedish manufacturer Supra continues to refine its range with the UHD8K, an Ultra High Speed–certified model designed to take full advantage of the latest advances in the HDMI 2.1 standard. This passive cable, manufactured in Ljungskile, Sweden, meets the demands of both home and professional installations, with particular attention paid to ease of installation in recessed conduits.

Bandwidth tailored for 8K and high-refresh 4K

The UHD8K cable exploits the full capacity of the HDMI 2.1 standard with a 48 Gbit/s TMDS bandwidth. This transfer capability allows transmission of 8K HDR signals (7680 × 4320 pixels) at 60 Hz over lengths of up to 5 meters, and of course 4K at 120 Hz for gamers equipped with recent consoles or powerful graphics cards.

Color depth reaches 48 bits, or 16 bits per channel, which allows for finer gradients and more natural color transitions, particularly visible on HDR10+ and Dolby Vision content. The cable also supports VRR (Variable Refresh Rate), a feature that synchronizes the display’s refresh rate with that of the source to eliminate stutter and screen tearing during fast-paced gaming sequences.

eARC serving advanced audio systems

On the audio side, the UHD8K integrates the Enhanced Audio Return Channel (eARC), the successor to classic ARC. This evolution of the protocol enables the transmission of uncompressed high‑resolution audio streams from a television to an amplifier or soundbar without loss of quality. Formats such as Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, and DTS:X are transmitted in full, whereas standard ARC required prior compression.

The cable also includes a 100 Mbit/s Ethernet channel, a function rarely used in practice but provided for in the HDMI specification for sharing a network connection between compatible devices.

Conductors and shielding: the approach of a seasoned cable manufacturer

The central conductor is made from high‑purity oxygen‑free copper with a cross‑section of 0.09 mm² (AWG 28), a choice that favors high‑frequency signal transmission over short to medium distances. The insulation uses air‑foamed polyethylene, a low‑dielectric‑constant material that reduces parasitic capacitance between conductors and preserves signal integrity.

The shielding consists of an aluminized PET foil fully wrapping the conductors, complemented by a screening structure that provides protection against electromagnetic (EMI) and radio‑frequency (RFI) interference. In a home environment where Wi‑Fi routers, cordless phones, and other sources of radiation coexist, this protection helps maintain a stable signal without visual artifacts or random dropouts.

The outer GA78 PVC jacket gives the cable a contained diameter of 6.5 mm, significantly thinner than the previous HD5 generation, which reached 9.5 mm. This reduction makes it easier to route through tight spaces and improves the cable’s overall flexibility.

Connectors designed for professional installation

One of the distinctive features of the UHD8K cable lies in its fully metal, detachable Met-S or Met-B connectors. Their shell can be removed to allow the cable to pass through conduits as small as 20 mm in diameter, then reattached once the installation is complete. This design avoids having to cut and resolder the cable on site, a delicate operation that can compromise the performance of a high‑speed cable.

The bare connector is 13.9 mm wide and 5.5 mm high, compact dimensions that make insertion easier even when multiple HDMI ports are arranged side by side on a device. Soldering is carried out with Almit SR-34 Super alloy, a material used in professional electronics for its mechanical strength and low contact resistance.

Supra optionally offers an accessory that converts the straight connector into an angled version, useful when the equipment is flush against a wall or installed in furniture with limited clearance at the back.

Certification and quality control

Each UHD8K cable is tested at the HDMI‑accredited test center in the United States, where it is subjected to the consortium’s verification protocols. This certification confirms compliance with Ultra High Speed specifications and the ability to transmit signals at the stated data rates. The cables carry a batch number allowing full traceability of components and manufacturing steps.

This certification process sets Supra cables apart from many products on the market that claim HDMI 2.1 compatibility without having undergone independent testing. With demanding signals such as 4K at 120 Hz with HDR, the difference between a properly engineered cable and an approximate model can show up as flicker, loss of sync, or an image that simply refuses to display.

Technical specifications

Video and audio performance

• Maximum resolution: 8K HDR 7680 × 4320 at 60 Hz (up to 5 m)
• TMDS bandwidth: 48 Gbit/s
• Color depth: 48-bit (16-bit per color channel)
• Audio: eARC (enhanced Audio Return Channel)
• Ethernet: 100 Mbit/s
• Standard: HDMI 2.1 Ultra High Speed HDR
• Features: 8K HDR compatible, VRR (Variable Refresh Rate)

Construction and materials

• Conductor: high-purity oxygen-free copper, 0.09 mm² (AWG 28)
• Insulation: air-blown PE (polyethylene) foam for minimal capacitance
• Internal shielding: 100% aluminized PET (polyethylene terephthalate) foil
  • Maximum EMI / RFI protection ensured by full aluminum shielding
• Solder: Almit SR-34 Super
• Transmission: bidirectional
• Sheath: GA78 PVC, round cable, 6.5 mm diameter

Connectivity

• Material: metal, fully shielded
• Configuration: detachable housing allowing straight or angled plug (accessory)
• Soldering: connectors carefully soldered and molded in solid plastic for optimal durability
• Installation: suitable for installation in conduits (diameter ≥ 20 mm)

Dimensions and physical specifications

• Available lengths: 0.5 m to 5 m (UHD8 slim cable)
• Connector width without shell: 13.9 mm
• Connector height without shell: 5.5 mm

General information

• Country of origin: Sweden
• Certification: tested and approved by the HDMI Accredited Test Center (United States)
• Quality: tested and certified for flawless performance
• Benefits: modular connectors for flexible installation, full shielding ensuring maximum protection