C155 - Loudspeaker CAMBRIDGE - Free user manual and instructions

Product Type	Ceiling Speaker (In-Wall/In-Ceiling)
Brand	Cambridge Audio
Model	C155
Quantity in Package	2 speakers
Driver Configuration	1 x 6.5" (165mm) Woofer
Frequency Response	60Hz - 20kHz (±2dB)
Sensitivity	90dB (2.83Vrms input)
Impedance	4 Ohms
Speaker Dimensions (H x Diameter)	75mm x 240mm (3" x 9.4")
Weight (per speaker)	1.1kg (2.4lbs)
Mounting Hole Diameter	Cutout size per included template (approx. 200-220mm)
Required Ceiling Thickness	10 - 30mm (0.39 - 1.18")
Required Clearance Behind Ceiling	At least 80mm (3.15")
Recommended Speaker Cable	16 gauge minimum, polarity marked
Grille Attachment	Magnetic, removable for painting
Paintable Grille and Frame	Yes, includes painting mask for cone protection
Mounting System	Dog-leg rotating clamps (screw-adjustable)
Fire Hood Compatibility	Check with builder/installer if required
Low Smoke/Zero Halogen Cable	May be required for certain installations
Compliance	RoHS, CE (implied)
Warranty	Standard Cambridge Audio warranty (register online)
Registration	Register at cambridgeaudio.com/register for updates
Color	White (paintable grille and frame)

Frequently Asked Questions - C155 CAMBRIDGE

What is the Cambridge C155 speaker?

The Cambridge C155 is a 6.5-inch ceiling speaker designed for in-ceiling installation. It features a 90dB sensitivity, 4-ohm impedance, and a frequency response of 60Hz-20kHz.

What is included in the box?

The package includes 2 x C155 Ceiling Speakers with mounting hardware, a cutting template, and a plastic painting mask for the grille.

How do I install the C155 speaker?

First, use the template to mark the cutout hole. Ensure the ceiling thickness is 10-30mm and there is at least 80mm clearance behind. Cut the hole with a drywall saw. Connect speaker wire (16 gauge min) to the terminals, observing polarity. Slacken the four fixing screws, rotate the dog-legs inward, place the speaker in the hole, and tighten screws clockwise to clamp the dog-legs against the ceiling.

Can I paint the speaker grille and frame?

Yes, the grille is magnetically attached and can be removed for painting. Use the included plastic painting mask to cover the speaker cone when painting the frame to avoid damage.

What type of amplifier is compatible?

The C155 has a 4-ohm impedance, so it is compatible with most home amplifiers. Ensure your amplifier can handle 4-ohm loads, especially if wiring multiple speakers.

How do I connect the speakers to my amplifier?

Use 16-gauge or thicker speaker wire. Strip about 10mm of insulation, twist the strands, and connect the red (+) terminal to the amplifier’s red (+) and black (-) to black (-). Maintaining correct polarity is crucial for sound quality.

What is the recommended mounting location?

Before cutting, test the area with a wire probe to avoid obstructions like studs or electrical wiring. Ensure the mounting surface is between 10-30mm thick and there is at least 80mm of clearance behind.

Do I need a fire hood for this speaker?

It depends on local building codes. Cambridge Audio recommends checking with your builder/installer whether a fire hood is required. Also, low smoke/zero halogen speaker cable may be needed.

What are the dimensions and weight?

Each speaker measures 75mm (height) x 240mm (diameter) and weighs approximately 1.1kg (2.4lbs).

How do I clean or maintain the C155?

The grille can be removed for gentle cleaning with a soft brush or vacuum. Avoid touching the driver cone. The grille and frame can be repainted if desired.

USER MANUAL C155 CAMBRIDGE

C155 Ceiling Speaker

Manual Generated: 15/03/2023 - 01:36

Table of Contents

C155 Ceiling Speaker 3

Introduction 4

What's included with the C155? 5

Installation Instructions 6

Painting the speaker grille and frame 8

Technical Specifications 9

C155 Ceiling Speaker

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

Users Manual

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.

For upcoming news on future products, software updates and exclusive offers, make sure you register your product at

http://www.cambridgeaudio.com/register

What's included with the C155?

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

1. 2 x C155 Ceiling Speakers.

Installation Instructions

Last updated: January 19, 2023 01:54. Revision #8393

1. Firstly, remove the cardboard pad from inside the supplied template to mark the position for the mounting hole at the selected location.

1. 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.

1. 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.
2. 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.
3. Use a wire stripper to strip 10mm of insulation from the end of each speaker cable and twist the strands together.
4. 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.

1. 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.

2. 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.

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.

1. 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.

Technical Specifications

Last updated: January 19, 2023 01:54. Revision #8395

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 ∅ 240mm (3 x ∅ 9.4")

Weight

1.1kg (2.4lbs)