C155 Ceiling Speaker

Introduction

This guide is designed to make installing and using the Cambridge Audio C155 Ceiling Speaker 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.

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What's Included with the C155?

• 2 x C155 Ceiling Speakers.

Installation Instructions

1. Firstly, remove the cardboard pad from inside the supplied template to mark the position for the mounting hole at the selected location. A circular template indicating a 207mm diameter mounting hole is provided.
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, 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. This process is illustrated by a diagram showing a probe being inserted into a ceiling hole to check for obstructions, with dimensions of 110mm (4.33").
3. Cut the mounting hole with a drywall or keyhole saw. Ensure 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.
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. This mechanism is illustrated by a diagram of the speaker's mounting dog-legs being tightened with a cross-head screwdriver.

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

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.
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. This process is illustrated by a diagram showing a speaker grille being detached and then spray-painted, with a clear mask protecting the speaker cone.

Technical Specifications

• 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)