JBL MTC 300SG12 Square Grille for 12-inch Control Series 300

JBL Professional MTC-300SG12 - 12-inch Square Grille for Control Series 300

The JBL Professional MTC-300SG12 is a contemporary square grille for the JBL Control 300 Series 12-inch in-ceiling speakers. Constructed from 19-gauge steel with a zinc base , it provides robust mechanical protection for the speaker assembly and a satin powder-coated finish (RAL 9016) that resists scratches and corrosion, and is easily repainted to blend with any architectural setting. Secured with four M4 corner screws, it ensures stable mounting to the speaker baffle, and comes with all the necessary hardware and washers for quick and clean integration. Measuring 414 x 414 mm with a minimal visible depth of 10.2 mm from the back of the baffle, it maintains a discreet and elegant aesthetic in commercial, corporate and hospitality installations.

Main features

• Heavy Duty Construction: 19 gauge galvanized (zinc plated) steel for maximum durability.
• Professional finish: RAL 9016 satin powder coating, scratch- and rust-resistant; repaintable to match the color.
• Secure mounting: Secures to the baffle with four M4 screws at the corners; includes hardware and coated countersunk washers.
• Format and dimensions: 414 × 414 mm square grille; 10.2 mm deep from the rear of the speaker.
• Optimized weight: 0.9 kg (net weight) for easy handling during installation.
• Sculpted design: contemporary aesthetic that blends into any decor.

Compatibility

Square grille accessory for 12" JBL Control 300 Series speakers. Confirmed compatibility with:

• Control 321C / 321CT (12" coaxial).
• Control 322C / 322CT (12" coaxial).
• Control 312CS (12" subwoofer).

In these configurations, the MTC-300SG12 is mounted on the speaker baffle ; models can use the MTC-300BB12 back box depending on the project's requirements.

Product benefits

• Aesthetic uniformity of the project: satin white finish with a contoured design that maintains a discreet and professional presence on exposed ceilings.
• Long lifespan in intensive installations: zinc base and powder coating help prevent rust and marks in high-traffic environments.
• Design flexibility: repaintable surface to match room color without compromising protection.
• Fast and reliable installation: four-point fixing pattern with M4 hardware included.

Use cases

• Commercial and retail facilities with suspended ceilings.
• Hotels, auditoriums, convention centers and corporate spaces.
• Restoration, education and public buildings requiring aesthetic integration of the audio system.

Frequently Asked Questions

• Can the grille be repainted? Yes. The satin powder-coat finish allows for repainting to match the room's color.
• What's included? 5 M4 × 38 mm coated screws and 5 M4 coated countersunk washers , plus the 4 corner mounting points for the speaker.
• Does it fit other sizes of the Control 300 series? No. This model is designed for 12-inch Control 300 series speakers (e.g., 321C/CT, 322C/CT, and 312CS).

Description for projects

JBL MTC-300SG12 square grille for 12" Control 300 series speakers. Material: 19 gauge steel with zinc base. Finish: Satin powder coat, white RAL 9016 (equivalent to Pantone 11-0602TPX). Attaches to the baffle with 4 M4 screws in the corners. Dimensions: 414 × 414 mm; depth from back of baffle: 10.2 mm. Net weight: 0.9 kg. Accessories included: 5 M4 × 38 mm coated screws and 5 M4 coated countersunk washers. Compatibility: Control 321C/CT, 322C/CT and 312CS.