

Flex Audio
Flex Audio 16/4 Outdoor Speaker Cable - 4 Core - LSZH
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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.
- 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