Monoprice Speaker Wire 100 ft 18 AWG 4 Conductor Plenum Rated - Safe

Our review of the Monoprice Plenum Speaker Wire finds it best suited for installers and homeowners who need a reliable, code-compliant cable for in-wall or commercial plenum spaces. The single biggest reason to buy is the CMP plenum rating combined with 100 percent pure bare copper conductors, which delivers both safety and consistent audio performance for distributed speaker systems. The cable's color coded Red, Black, White, and Green conductors make termination straightforward, and the softer, more flexible jacket compared with older plenum cables eases routing in tight runs.

Key Features

• Plenum (CMP) rating: Provides a fire-retardant jacket suitable for plenum spaces and helps meet building safety and insurance requirements.
• 100 percent pure bare copper: High purity oxygen-free copper conductors ensure reliable signal transfer for clear speaker performance.
• 4 conductor design: Four color coded conductors simplify stereo and bi-amping installations by making connections easy to identify.
• Soft, flexible jacket: A higher quality jacket material than older plenum cables makes the wire easier to pull through conduit and behind walls.
• UL approval: Approved by Underwriters Laboratories, offering reassurance for commercial and residential installers that the cable meets industry standards.

Who It's For

This cable is aimed at professional installers, contractors, and homeowners who need a plenum-rated speaker solution for in-wall or ceiling runs in commercial and residential buildings. Its CMP rating and UL approval make it a sensible choice where code compliance and fire safety are required.

It is less appropriate for casual users who want the most flexible or display-grade braided speaker leads for short, exposed runs; some buyers report mixed impressions of stiffness and insulation feel, so if maximum suppleness or decorative appearance is critical, a different non-plenum jacketed cable would be better.

Pros & Cons

Pros

• Plenum (CMP) rating and UL approval for safe in-wall installation in air-handling spaces.
• High purity oxygen-free bare copper conductors for dependable audio transfer and consistent performance.
• Four clearly color coded conductors reduce installation errors and speed termination.
• Soft, more flexible jacket than older plenum cables, making runs easier in many installations.

Cons

• Some users note variable stiffness and insulation feel, so it may not be as supple as non-plenum decorative cables.

Specifications

Length	100 ft
Gauge	18 AWG
Conductors	4 conductor (Color coded Red, Black, White, Green)
Conductor material	100 percent pure bare oxygen-free copper
Jacket rating	CMP Plenum rated (fire-retardant)
Safety approval	Underwriters Laboratories approved

Our Verdict

The Monoprice Plenum Speaker Wire is a practical, cost-effective choice for in-wall and commercial audio installs where fire safety and code compliance matter. Its pure copper conductors and clear color coding give reliable performance and simple termination, and the softer plenum jacket helps with routing. Choose this cable for installations that require CMP rating; users wanting the most flexible or decorative exposed cable should consider non-plenum alternatives.

Frequently Asked Questions

Is this cable safe for use in air-handling spaces?
Yes. The cable is CMP plenum rated and has UL approval for use in plenum spaces where air is circulated.

What wiring colors are included?
The cable has four color coded conductors: Red, Black, White, and Green for easy identification during installation.

Will this wire give good audio quality?
Yes. The conductors are 100 percent pure bare oxygen-free copper, which supports reliable signal transfer suitable for most speaker installations.