Monoprice Inc. 113735 speaker wire CMP 4-conductor 18AWG 500ft Black

CMP-Rated 4-Conductor 18AWG Speaker Wire

Monoprice 113735 is a 500-foot plenum-rated speaker cable built for in-wall and commercial air-space installations. Four 18AWG oxygen-free copper conductors carry stereo pairs or bi-wire runs through a single jacket. The UL CMP rating certifies the jacket for use in plenum ducts of commercial buildings. Lifetime warranty backs the cable.

Verify Plenum Requirements and Conductor Count

Confirm local codes require CMP-rated cable for the intended air-handling spaces before purchase. Ensure the four-conductor layout matches your speaker wiring plan, whether for stereo pairs or bi-wiring. Measure the longest run to confirm 152.4 metres covers the distance with slack for terminations. Check that 18AWG gauge suits the amplifier power and cable length for your system.

Upgrade From Non-Plenum or Two-Conductor Cable

This cable replaces standard riser-rated or non-rated speaker wire when fire code demands plenum safety. It also replaces two-conductor wire when a single pull must feed two speakers or a bi-wireable pair. The jump is worth it when building inspectors require CMP rating or when pulling one four-conductor cable saves labour over multiple two-conductor runs.