Monoprice Nimbus Series 12 AWG 4-Conductor CMP-Rated Speaker Wire – 250 ft, UL Plenum, 100% Bare Copper

Meet the Monoprice Nimbus Series Plenum Speaker Wire, a rugged 12 AWG, 4-conductor cable designed for spaces with circulating air. The plenum jacket is fire-retardant and engineered to meet demanding safety standards, making it suitable for in-wall and above-ceiling installations in both homes and commercial settings. UL-listed for added assurance, this cable maintains high performance across long runs while remaining flexible enough to navigate tight chases and corners.

Crafted with 100% pure oxygen-free bare copper conductors, the wire delivers a clean signal path with low resistance and durable termination. The conductors are color coded in Red, Black, White, and Green to help identify each line quickly during terminations, reducing setup time and the risk of mis-wiring. The construction feels soft and pliable, easing routing through walls, conduits, and drop ceilings without kinking or binding.

The Nimbus Series is offered in multiple gauges and lengths to fit a range of projects. The 12 AWG, 4-conductor configuration shown here is paired with a generous 250-foot spool, which helps minimize reel changes on larger installs. This combination of safety credentials, ease of handling, and Monoprice durability makes it a practical choice for both new constructions and retrofit work.

In real-world installations, you may notice tidy runs inside walls or above ceilings, with improved cable management thanks to clear conductor coding and a flexible jacket that responds well to bends and turns. While performance figures can vary by system and environment, many installers find this cable suitable for home theater setups, multi-room audio, or commercial sound applications that require plenum-rated cabling and reliable connections.

Key benefits

• CMP-rated jacket meets fire safety and insurance requirements for in-wall and plenum spaces.
• UL-listed for an added layer of safety certification.
• Conductors made of high-purity oxygen-free bare copper for clean signal transfer.
• Soft, flexible jacket is easier to route than many traditional plenum cables.
• Color-coded Red, Black, White, and Green conductors aid quick identification.
• Available in multiple gauges and lengths, including 12 AWG 4-conductor and a 250 ft spool.

Ideal uses and installation notes

• Residential in-wall and ceiling speaker runs for home theater or multi-room audio.
• Commercial or enterprise spaces with plenum routing in ceilings or air ducts.
• Long cable runs where UL-plenum compliance and reliable copper conductors are beneficial.

Choosing the Monoprice Nimbus Plenum Wire provides a balance of safety, flexibility, and dependable performance for professional installations, without overpromising results. Consider it a capable option for projects where code compliance and ease of installation matter most.