Monoprice

Monoprice 2-Conductor 18AWG CL2 Rated Speaker Wire

1.0 (1 reviews)

CL2-rated 18AWG oxygen-free copper speaker wire with color-coded conductors for safe in-wall installation.

$26.99*
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*Price sourced from Amazon.com. Last updated:Jun 28, 2026.Price and availability are subject to change.

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Overview

The Monoprice 2-Conductor 18AWG Speaker Wire is a straightforward, well-constructed cable designed for home audio and home theater speaker connections. Its two conductors are made from oxygen-free bare copper with a purity exceeding 99.95%, which minimizes resistance and ensures that the total load presented to your amplifier closely matches the impedance curve of your speakers. This matters because added resistance from lower-quality wire can alter the amplifier's damping factor and subtly affect sound quality, particularly over longer runs.

The CL2 rating is the key differentiator for anyone planning permanent installations. This certification means the wire's PVC jacket meets fire safety requirements for routing inside the walls of residential buildings, making it compliant with building codes and insurance standards — something standard speaker wire without a CL2 rating cannot claim. Each conductor is jacketed in a distinct color for instant polarity identification, eliminating the guesswork that can lead to out-of-phase speaker wiring. At 50 feet, the spool covers most single-room setups, and the 18AWG gauge is well-suited for typical speaker runs under 25-30 feet at standard 8-ohm impedance.

Key Features

Features two conductors made of high purity (greater than 99.95 percent pure), oxygen-free bare copper.

Each conductor is jacketed with color-coded PVC for easy polarity identification.

CL2 rating indicates that the cable complies with fire safety and insurance requirements, making it safe for use inside the walls of residential class buildings.

Using Pure Bare Copper speaker wire ensures that the total load put on the amplifier remains as close as possible to the impedance curve of your speakers.

18AWG.

Specifications

Brand
Monoprice
Model
41391
Gauge
18AWG
Conductors
2
Conductor Material
Oxygen-Free Bare Copper (99.95%+ purity)
Length
50 ft
Jacket
Black, CL2-Rated PVC
CL2 Rated
Yes
Polarity Identification
Color-Coded PVC

Pros & Cons

👍 Pros

  • High-purity oxygen-free bare copper (99.95%+) minimizes signal degradation and maintains accurate amplifier loading
  • CL2-rated jacket allows safe, code-compliant installation inside residential walls
  • Color-coded conductor jackets make polarity identification quick and error-free during installation
  • 50-foot length provides enough wire for most single-room speaker setups without purchasing excess

👎 Cons

  • 18AWG thickness limits effective use to shorter runs of roughly 25-30 feet before resistance becomes a concern
  • Only two conductors, so bi-wiring a single speaker requires running two separate cables
  • 50-foot length may not be enough for larger rooms or whole-home audio installations requiring multiple long runs

Frequently Asked Questions

The CL2 rating certifies that the wire meets fire safety standards for installation inside walls of residential buildings, complying with insurance and building code requirements for in-wall cabling.
Oxygen-free copper (greater than 99.95% purity) reduces oxidation and corrosion at connection points over time, and ensures the wire's impedance stays consistent so your amplifier sees the intended speaker load without added resistance.
Each of the two conductors is jacketed in a different color of PVC, making it easy to maintain consistent polarity across all speaker connections without guessing or testing.
18AWG is appropriate for speaker runs up to approximately 25-30 feet at typical impedance loads. For longer runs or lower-impedance speakers, a thicker gauge like 16AWG or 14AWG is recommended to minimize resistance.
This particular product comes in a 50-foot length.