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

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
-   **Warranty:** 1 Year

## Details

- **Price:** 55.0 GBP - 260.0 GBP
- **Vendor:** Flex Audio
- **Type:** Cables
- **Tags:** dfw_feed_exclude, Prime

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 20M | 55.00 GBP | In stock |
| 50M | 139.00 GBP | In stock |
| 100M | 260.00 GBP | In stock |

## Images

- Flex Audio 16/4 Outdoor Speaker Cable - 4 Core - LSZH - K&B Audio
- Flex Audio 16/4 Outdoor Speaker Cable - 4 Core - LSZH - K&B Audio

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> Source: [K&B Audio](www.kbaudio.co.uk/products/flex-audio-16-4-outdoor-speaker-cable-4-core-lszh)
> Updated: 2026-05-22