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Monoprice 113710 Nimbus 12AWG CMP-Rated Speaker Wire 500ft — main product image
Monoprice

Monoprice 113710 Nimbus 12AWG CMP-Rated Speaker Wire 500ft

★★★★★5.0 (2 reviews)

CMP-rated 12AWG pure copper speaker wire built for safe, high-fidelity in-wall installations over long runs.

$421.99*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Monoprice Nimbus 113710 is a 12AWG, 2-conductor speaker wire designed specifically for in-wall and plenum-space installations. Its CMP rating means it meets UL fire safety standards for use in air-handling spaces — a requirement in many commercial and residential building codes. The conductors are made from 100% pure bare copper, which provides lower resistance and better signal fidelity compared to copper-clad aluminum alternatives, particularly over the long runs common in whole-building audio systems.

What sets this cable apart from many plenum-rated options is its jacket flexibility. Traditional plenum cables often use rigid jackets that make installation difficult, but Monoprice engineered a softer, more pliable fire-retardant plastic that eases routing through walls, ceilings, and conduit. The red and black color-coded conductors eliminate guesswork when wiring multiple speakers across a building. Sold on a 500ft spool and backed by Monoprice's lifetime cable warranty, this wire is aimed squarely at professional installers and serious DIYers tackling large-scale audio projects.

Key Features

Lifetime Warranty on ALL Cables: With Monoprice's Lifetime Warranty you can rest assured we stand behind our products and our customers.

The Plenum (CMP) rating indicates that the cable complies with fire safety and insurance requirements, making it safe for use inside the walls of residential and enterprise class buildings.

This speaker Wire | features conductors made of high purity oxygen-free bare copper.

Monoprice Plenum Speaker Wire | uses a high quality material that is soft -er and more flexible than on traditional plenum rated jackets.

Easily identifiable Red and Black conductors.

Specifications

Brand
Monoprice
Model
113710
Wire Gauge
12 AWG
Number of Conductors
2
Length
500 ft
Rating
CMP (Plenum)
Conductor Material
100% Pure Bare Copper
Jacket Material
Fire-Retardant Plastic
Safety Standard
UL Plenum Rated
Conductor Identification
Color-Coded (Red and Black)
Warranty
Lifetime

Pros & Cons

👍 Pros

  • CMP plenum rating allows safe installation inside walls and air-handling spaces where standard cable is not permitted.
  • Pure bare copper conductors deliver low resistance and clean signal transfer across long runs.
  • 500ft bulk spool provides enough wire for large-scale residential or commercial installations.
  • Softer, more flexible jacket than typical plenum cables makes routing and pulling through walls easier.
  • Color-coded red and black conductors simplify correct polarity identification during installation.

👎 Cons

  • 12AWG bulk wire is heavy and stiff compared to lighter gauges, making it harder to work with in tight spaces.
  • No connectors or terminations included, so additional hardware and prep work are required.
  • 500ft is the only available length, which may be excessive for smaller single-room projects.
  • Not rated for direct burial or outdoor use — limited to indoor plenum and in-wall applications.

Frequently Asked Questions

The CMP rating means this cable uses a fire-retardant jacket that meets UL standards for installation in plenum spaces — the air-handling areas inside walls and ceilings. This makes it compliant with fire safety and insurance requirements for both residential and commercial buildings.
Yes. The 12AWG gauge and 100% pure bare copper conductors minimize resistance over long distances, making the 500ft spool well-suited for large venues, whole-home audio, or commercial installations where runs can be lengthy.
The two conductors are color-coded red and black, making it easy to maintain correct polarity throughout your installation without needing to trace or mark wires.
Monoprice designed this plenum-rated jacket to be softer and more flexible than traditional plenum cables, which typically use stiff PVC. This makes pulling through walls and conduit easier during installation.
No. This is bulk speaker wire sold on a 500ft spool. You will need to cut it to length and terminate it with your own connectors, banana plugs, or bare wire connections.

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