User Manual for Tannoy CMS 1201DCT and CMS 1201DC Ceiling Loudspeaker

Quick Guide

The Tannoy CMS 1201DC and CMS 1201DCT are large-format in-ceiling loudspeakers designed for high-ceiling installations such as ballrooms, shopping malls, and sports halls. The system consists of three main components: the loudspeaker assembly, a steel back-can, and a grille assembly.

Product Overview

The system comprises three discrete components:

• Loudspeaker assembly: Includes a Dual Concentric drive unit mounted on a ported steel baffle and a crossover. The DCT model includes a line transformer.
• Steel back-can: Features multiple mounting points and is internally dampened with OSB2 board for low-frequency performance.
• Grille assembly: Includes a moulded bevel cover.

Installation Guide

Mounting Options

The back-can is designed for versatility with several mounting methods:

• Unistrut roof rail system: Steel mounting lugs allow for direct fitting or via secondary prefixed cross struts. Use a large series washer at the fixing point to distribute the load.
• Eyebolts: The rear of the back-can has mounting points for M10 and 3/8 UNC threaded eyebolts for suspension.
• Screwed Rod: Supports single-point central hanging via M10 or 3/8 UNC threaded rod using the slotted mounting saddle on top of the back-can.

Fitting the Loudspeaker Assembly

Mounting the assembly to the pre-installed back-can is a one-person job. One edge of the baffle clips onto the steel box to hold it in place while the installer secures the assembly. Connections are made via terminal barrier strips inside the can, accessible through 20 mm and 29 mm conduit knockouts on all five sides.

Fitting the Grille

Once the loudspeaker assembly is secured, attach the grille assembly with its moulded bevel cover to complete the installation.

Wiring and Setting Up

The CMS 1201 is available in a low-impedance variant (CMS 1201DC) and a transformer-equipped version (CMS 1201DCT) for 70 V or 100 V distributed lines. Transformer tappings must be configured before screwing the driver assembly into the back-can:

• 70 V systems: 60 W / 30 W / 15 W / 7.5 W / OFF
• 100 V systems: 60 W / 30 W / 15 W / OFF

If level adjustment is required later, the baffle can be hung from the can via a hinged edge, allowing for hands-free adjustment.

Technical Specifications

• Frequency response (-3 dB): 60 Hz - 20 kHz
• Nominal Coverage Angle: 90 Degrees Conical
• Power Handling (Average/Programme/Peak): 200 W / 400 W / 800 W
• Nominal Impedance: 8 Ohms
• Dimensions (H x W x D): 331 x 725 x 516 mm

Safety Information

Always consult local safety standards and regulations before installing overhead equipment. Ensure the mounting surface can support the weight of the loudspeaker. Use only high-quality professional speaker cables with 1/4" TS or twist-locking plugs. Repairs must be performed by qualified service personnel only.