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Made in Łódź
Copper, cross-section, braid. The list ends there.
4.0 mm² pure OFC copper cores, braided 16 strands wide and resistance-tested under 25 amperes, built to move current without adding an opinion of its own.
Unitra KG-40 Speaker Cables
Popular upgrades
Pairs well with
European engineering heritage since 1961 — designed and built to be heard, not simulated.
Unitra KG-40 Speaker Cables
Technical specifications
| Conductor material | Pure oxygen-free copper (OFC) |
| Cross-section | 4.0 mm² per core |
| Conductor construction | 16-strand twisted braid |
| Wire resistance | ≤0.0049 Ω/m |
| Core separator | Aluminum foil layer |
| Jacket (inner & outer) | PVC compound |
| Connectors | Gold-plated flexible banana plugs |
| Operating temperature range | 0°C to 80°C |
| Lengths available | 2.5 m or 4.0 m (pair); custom lengths on request |
What is the actual copper cross-section of the KG-40?
What lengths does the KG-40 come in?
What connectors are fitted?
How is the cable's resistance verified?
What's the difference between the KG-25 and KG-40?
Where is the KG-40 made?
About the Unitra KG-40 Speaker Cables
Audiophile Connection, Honestly Engineered
The Unitra KG-40 Speaker Cables deliver audiophile-grade connectivity without the snake oil. Built from pure oxygen-free copper (OFC) with a generous 4 mm² cross-section and a parallel-twisted conductor geometry, they move your amplifier's signal to your speakers with low resistance and excellent integrity. Terminated with gold-plated flexible banana plugs that fit a wide range of binding posts, they're a genuine upgrade that's ready to use out of the box.
Why Cross-Section Matters
The KG-40's substantial 4 mm² conductors keep wire resistance down to just 0.0049 Ω/m, which matters most over longer runs and with lower-impedance speakers — less series resistance means tighter bass, better damping and no loss of dynamics between amp and driver. Parallel-twisted conductors help reject interference and keep the signal clean.
Built and Terminated to Last
An aluminium cable separator and a flexible PVC compound filler give the KG-40 a stable, durable geometry, while the PVC inner jacket keeps everything protected and easy to route. The gold-plated banana plugs resist corrosion for a reliable, low-loss connection year after year. Supplied as a pair in your choice of 2.5 m or 4 m lengths.
Why You'll Love the KG-40
- Pure oxygen-free copper (OFC) with a generous 4 mm² cross-section
- Low wire resistance (0.0049 Ω/m) for tight, dynamic sound
- Parallel-twisted conductors for clean signal transfer
- Gold-plated flexible banana plugs fit a wide range of terminals
- Supplied as a terminated pair in 2.5 m or 4 m lengths
Frequently Asked Questions
Are the KG-40 cables terminated?
Yes. Each cable comes fitted with gold-plated flexible banana plugs designed to fit a wide range of amplifier and speaker terminals.
What lengths are available?
They're supplied as a pair in either 2.5 m (8.2 ft) or 4 m (13.1 ft) lengths.
How do the KG-40 compare to the KG-25?
The KG-40 uses a larger 4 mm² conductor versus the KG-25's 2.5 mm², giving even lower resistance — a good choice for longer runs or more demanding speakers.
KG-40 Technical Specifications
| Material | Oxygen-free copper (OFC) |
| Cross-section | 4 mm² |
| Wire resistance | 0.0049 Ω/m |
| Conductor type | Parallel-twisted |
| Termination | Gold-plated flexible banana plugs |
| Cable separator | Aluminium |
| Inner jacket / filler | Flexible PVC compound |
| Operating temperature | 0°C to 80°C (32°F to 176°F) |
| Lengths | 2.5 m (8.2 ft) or 4 m (13.1 ft) |
| Quantity per package | 2 (pair) |
