Triangle OPERA OS25A (2 x 2.5m)

Triangle OPERA OS25A: pre-terminated speaker cable

Forty years of expertise in loudspeaker manufacturing 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-metre cables with banana plug terminations. This cable reflects the Picardy-based manufacturer’s philosophy: prioritising signal transmission quality without inflated pricing.

Copper treated to stand the test of time

The choice of conductor lies at the heart of the OPERA OS25A’s design. Triangle opted for OFC (Oxygen Free Copper), purified to 99.99% through a process that removes oxygen during melting. This purity ensures a uniform crystalline structure that allows the electrical signal to pass with minimal resistance.

What sets this cable apart is 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 when exposed to air, which can gradually impair conductivity. Tinning preserves the conductor’s properties and ensures greater durability, a valuable asset for a long-lasting installation.

A carefully designed structure beneath the transparent jacket

The tinned copper strands use a helical braid rather than a conventional parallel arrangement. This geometry helps limit electromagnetic interference that could disrupt the audio signal. The cross-sectional area of 2.5 mm² per conductor suits most home installations, whether driving bookshelf speakers or living-room floorstanding speakers.

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

Ready-to-connect terminations

The banana plugs fitted to each end of the cable use an anodised aluminium housing that protects the connection. The centre contact is gold-plated, a treatment that preserves connection quality over time by preventing oxidation of the conductive surface.

This pre-terminated format offers an obvious practical advantage: no conductor preparation, stripping or crimping is required. The plugs insert directly into spring-loaded or screw terminals, reducing the risk of improperly inserted strands or accidental short circuits between polarities.

A versatile cable for hi-fi and home cinema

Although Triangle developed this cable with its own speakers in mind, the OPERA OS25A adapts easily to other brands. Its neutral signature, without pronounced colouration, respects the character of the electronics and drivers with which it is paired. It is equally at home in a stereo system dedicated to music listening or a multichannel installation.

The 2.5-metre length of each cable meets the typical needs of a medium-sized living room, where the amplifier generally occupies a central position relative to the speakers. For setups requiring longer distances, Triangle also offers reels of Opera cable sold by the metre, 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