The JBL MTC-42MR is a specialized mud ring construction bracket sold in a convenient six-pack, designed for the efficient and code-compliant rough-in installation of multiple JBL Control 42C and similar ceiling loudspeakers in new construction or major renovation projects. Each mud ring serves as a critical structural interface, installed directly onto ceiling framing members before drywall is applied, to provide a rigid, secure platform for the loudspeaker's back-can. This professional mounting solution ensures that speakers are perfectly aligned, plumb, and ready for final installation after the ceiling finish is complete, meeting electrical and building code requirements for safety and performance in commercial and architectural settings.

Constructed from heavy-gauge, galvanized steel, each mud ring is engineered for durability and corrosion resistance within plenum air spaces. Its design is precisely tailored to the dimensions and mounting pattern of the compatible Control 42C loudspeaker back-can, guaranteeing a perfect fit. The open-frame design allows electricians and audio integrators easy access during the rough-in phase to run and connect speaker cables. The six-pack format provides cost-effective bundling for projects requiring multiple speakers, such as in offices, retail spaces, schools, or hotels, streamlining procurement and ensuring consistency across the installation.

This accessory is an essential tool for contractors and system integrators who adhere to professional installation standards. By providing a dedicated, manufacturer-supported structural mount, the MTC-42MR mud ring ensures that the final installation is not only acoustically optimal but also mechanically secure, preventing sagging or movement over time. It represents the professional practice of addressing the structural integration of audio components with the same rigor as their electronic performance, contributing to the overall longevity, reliability, and quality of the installed sound system.