C155 Ceiling Speaker

Overview

Last updated: December 6, 2022 03:50. Revision #8134

Diagram Description: A line drawing shows the C155 ceiling speaker with its circular grille detached. The speaker unit itself is circular with mounting brackets and a central driver housing.

Introduction

Last updated: January 19, 2023 01:54. Revision #8391

This guide is designed to make installing and using this product as easy as possible. Information in this document has been carefully checked for accuracy at the time of printing; however, Cambridge Audio's policy is one of continuous improvement, therefore design and specifications are subject to change without prior notice.

This document contains proprietary information protected by copyright. All rights are reserved. No part of this manual may be reproduced by any mechanical, electronic or other means, in any form, without prior written permission of the manufacturer. All trademarks and registered trademarks are the property of their respective owners.

© Copyright Cambridge Audio Ltd .

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What's Included with the C155?

Last updated: January 19, 2023 01:54. Revision #8392

• 2 x C155 Ceiling Speakers.

Installation Instructions

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1. Firstly, remove the cardboard pad from inside the supplied template to mark the position for the mounting hole at the selected location.
2. Before cutting ceiling speaker holes, it is suggested that the area is tested for clearance by making an L-shaped probe from strong wire (see illustration below), drilling a small hole in the target area, inserting the probe and slowly turning. Any obstructions will be immediately obvious, and the target area can be moved to a more suitable position.

Diagram Description: A circular template is shown with "C155 207mm diameter mounting hole" written inside.

Diagram Description: Two diagrams illustrate the clearance test. The first shows a cross-section of a ceiling with a small hole drilled, and an L-shaped wire probe being inserted and rotated. The second diagram shows a cross-section of a ceiling with dimensions: "110mm (4.33")" indicating a depth or width measurement related to the installation space.

3. Cut the mounting hole with a drywall, or keyhole saw. Be sure the mounting surface is between 10 and 30mm (0.39 - 1.18”) thick, and that there is at least 80mm(3.15") of clearance behind the mounting surface.
4. Use 16 gauge minimum speaker cable to connect between your amplifier and your speakers. Ensure that speaker cables are routed away from any electrical cables and that any amplifiers/sources are switched off during installation.
5. Use a wire stripper to strip 10mm of insulation from the end of each speaker cable and twist the strands together.
6. When connecting speakers pay extra attention to polarity ensuring that red (+) terminals on your amplifier are connected to the red (+) terminals on your speakers, and that the black (-) terminals on your amplifier are connected to the black (-) terminals on your speakers.

Diagram Description: Two diagrams show speaker terminals with positive (+) and negative (-) markings. Wires are depicted connecting from left (amplifier) to right (speaker) terminals, illustrating correct polarity matching (red to red, black to black).

7. Ensure that the four fixing screws on the speaker are slackened off allowing the mounting dog-legs to move freely. Move each dog-leg foot to the LEFT into its holding slot and then line the speaker up in the mounting hole.
8. With the speaker in the mounting hole use a cross-head screwdriver to slowly turn each fixing screw clockwise, moving the dog-legs out of their slots. Tighten these screws until the dog-legs grip the ceiling.

Diagram Description: An exploded view shows the speaker being inserted into a ceiling hole. A screwdriver is shown turning a fixing screw, which engages a 'dog-leg' mechanism that clamps onto the ceiling material from behind.

Note: Please check with your builder/installer whether you need to install a fire hood with this product. “Low smoke/zero halogen” specification Speaker cable may also be required.

Painting the Speaker Grille and Frame

Last updated: January 19, 2023 01:54. Revision #8394

The C155 speaker grille is attached by a magnet, allowing it to be easily removed for painting.

1. Carefully remove the grille ensuring not to damage the speaker cone.
2. Paint the grille using your chosen paint.

Diagram Description: A diagram shows the circular speaker grille being detached from the speaker. Another part of the diagram shows a spray can emitting paint towards the grille.

3. If you wish to paint the speaker surround, please use the included clear plastic painting mask to cover the speaker cone and avoid causing damage.

Diagram Description: A clear plastic mask is shown being placed over the speaker cone before painting the surrounding frame.

Technical Specifications

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Sensitivity (SPL)

90dB (2.83 Vrms input)

Frequency Response

60Hz - 20kHz (+/- 2dB)

Impedance

4 Ohms

Drivers

1 x 6.5" (165mm) woofer.

Speaker Dimensions (H x W x D)

75 x Ø 240mm (3 x Ø 9.4”)

Weight

1.1kg (2.4lbs)