Triangle OPERA OS25A (2 x 2.5m)

Triangle OPERA OS25A: pre-terminated speaker cable

Forty years of expertise in loudspeaker manufacturing have led Triangle to develop its own range of cables. The OPERA OS25A embodies this approach by offering a ready-to-use solution, supplied as a pair of 2.5-meter cables with banana plugs. This cable is fully in line with the philosophy of the Picardy-based manufacturer: prioritizing signal transmission quality without excessive pricing.

Treated copper built to last

The choice of conductor is at the heart of the OPERA OS25A’s design. Triangle has opted for OFC (Oxygen Free Copper), purified to 99.99% by removing oxygen during the smelting process. This level of purity ensures a homogeneous crystalline structure that promotes the flow of electrical signal with minimal resistance.

The distinctive feature of this cable lies in its Tinned OFC treatment: each copper strand receives a tin coating that forms a barrier against oxidation. Over the years, bare copper tends to corrode on contact with air, which can gradually impair conductivity. Tin-plating preserves the conductor’s properties and ensures enhanced durability, a valuable asset for a long-term installation.

Carefully engineered architecture under the transparent jacket

The tinned copper strands are arranged in a helical braid rather than the traditional parallel layout. This geometry helps limit electromagnetic interference that could contaminate the audio signal. The 2.5 mm² cross-section per conductor is suitable for most home setups, whether powering bookshelf speakers or floorstanding models in a living room.

The outer transparent PVC jacket reveals the internal structure of the cable. Beyond aesthetics, this transparency makes identification easier thanks to printed markings: cable direction, positive and negative polarity, and length indication. These markers simplify connection and help avoid phase errors between the two speakers.

Ready-to-plug terminations

The banana plugs at each end of the cable use an anodized aluminum shell that protects the connection. The central contact is gold-plated, a treatment that preserves connection quality over time by preventing oxidation of the conductive surface.

This pre-terminated format offers a clear practical advantage: no conductor preparation, no stripping, no crimping required. The cable can be inserted directly into spring-clip or screw terminals, reducing the risk of poorly inserted strands or accidental short circuits between polarities.

A versatile cable for hi-fi and home theater

Although Triangle designed this cable with its own speakers in mind, the OPERA OS25A easily adapts to other brands. Its neutral, uncolored sonic character respects the personality of the electronics and transducers with which it’s paired. It is equally at home in a dedicated stereo music system or a multichannel home theater setup.

The 2.5-meter length per cable meets the typical needs of a medium-sized living room, where the amplifier is generally positioned centrally relative to the speakers. For setups requiring longer runs, Triangle also offers Opera cable on reels, sold by the meter, to be fitted with BP400 banana plugs sold separately.

Technical specifications

Construction and materials

• Conductor cross-section: 2 × 2.5 mm²
• Oxygen-Free Copper (OFC) conductors
  • Multi-strand type for optimal flexibility
  • Excellent electrical conductivity
  • Low resistance for optimal signal transmission
• Transparent PVC sheath insulation
  • Protection against electromagnetic interference
  • Neat, attractive finish

Connectors

• Pre-fitted banana plugs
  • Material: anodized aluminum
  • Secure and durable connection
  • Quick and easy installation
• Anti-oxidation treatment for extended lifespan

Dimensions and configuration

• Length: 2 × 2.5 m
• Configuration: pair of cables (left + right)
• Ready-to-use cables

Use

• Application: amplifier-to-speaker connection
• Design optimized for TRIANGLE speakers
• Compatible with all amplifiers equipped with banana plug terminals