The Flex Audio 16/4 OFC External Speaker Cable 16AWG 4 Core is a professional-grade outdoor speaker cable built for permanent installations exposed to the elements, including garden audio, outdoor cinema setups, and any application where the cable run passes outside.

Constructed with 99.9999% pure oxygen free copper conductors, this cable delivers the clean, low-resistance signal path that Hi-Fi and home cinema systems demand — without any compromise for outdoor use.

The UV-resistant black polyethylene (PE) outer sheath is weather resistant to ISO4892-3, making this cable a reliable long-term choice for exposed runs in gardens, outbuildings, soffits, and other external environments.

With four individually colour-coded cores, the cable supports bi-wiring or dual-zone speaker runs from a single external cable, keeping outdoor installations tidy and reducing the number of cable routes required.

• Outdoor-Ready PE Sheath: UV-resistant black polyethylene outer sheath is weather resistant to ISO4892-3, protecting the cable against sun, rain, and temperature extremes in external installations.
• Oxygen Free Copper: 99.9999% pure OFC stranded conductors minimise signal loss and maintain audio fidelity over long outdoor cable runs.
• 4 Core Configuration: Four colour-coded cores allow bi-wiring or two independent speaker zones to be served from a single cable, simplifying external routing.
• LSZH Core Insulation: Individual conductor insulation is Low Smoke Zero Halogen for added safety in any enclosed sections of the run.
• EN50575 CPR Rated: Carries an Fca CPR classification, appropriate for external installation applications.
• Wide Temperature Range: Rated from -20°C to 80°C, covering the full range of UK outdoor conditions and beyond.

Specifications

• Part Number: QCS016/4-EXT
• Gauge: 16AWG
• Number of Cores: 4
• Conductor: Stranded Pure Oxygen Free Copper (99.9999%)
• Conductor Size: 16AWG
• Conductor DC Resistance: <12.6 Ω/km
• Insulation: LSZH, Ø2.25 mm
• Filler: Cotton Rope
• Outer Sheath: UV Resistant External PE, Ø7.50 mm
• Sheath Colour: Black
• Weather Resistance: ISO4892-3
• Colour Code: Core 1 Black, Core 2 Red, Core 3 White, Core 4 Green
• Operating Voltage: 450/750V
• Test Voltage: 3000V
• Insulation Resistance: >200 MΩ/km
• Rated Temperature: -20°C to 80°C
• EN50575 CPR Class: Fca
• RoHS2 Compliant: Yes (2015/863)
• REACH Compliant: Yes