Contents, Introduction | Cambridge Audio 550A, 650A specification

Contents
Introduction	2
Important safety instructions	3
Limited warranty	4
Rear panel connections	5
Connections	6
Front panel controls	8
Remote control	9
Custom installation use	9
CAP5 protection system	10
Technical speciﬁcations	11
Troubleshooting	11

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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.

Introduction

Thank you for purchasing this Cambridge Audio Azur 550A or 650A ampliﬁer. We are conﬁdent that you will enjoy many years of listening pleasure from it.

Developed as part of our on-going research and development regime, including extensive listening tests, we have incorporated many subtle tweaks and improvements to our circuits, components and layouts in the pursuit of our passion for sound quality. Speciﬁcally, these models use new output transistors, a new high-quality Alps volume pot, new polypropylene signal capacitors, gold-plated speaker outputs, custom- made electrolytic capacitors in critical positions and several new circuit tweaks.

These models are amongst the ﬁrst to feature a new casework design with a thicker braced front panel, more rigid wrap-over lid assembly and dual-layer damped feet, all of which contribute to better resonance control.

A new version of our proprietary CAP5 system has been developed to allow a greater dynamic envelope to the protection scheme, offering a more dynamic real-life performance. Also featured is an environmentally friendly low power (<1W) standby circuit. This circuit completely powers down the ampliﬁer circuits in Standby mode yet is itself totally isolated when the ampliﬁer is on, thus having no effect on sound quality.

Both the 550A and 650A have fully buffered input circuits for low crosstalk and improved stereo imaging, driving a completely discrete bipolar transistor-based ampliﬁer and all powered from a custom audiophile-grade toroidal transformer. A new MP3/Portable Media Player input has been ﬁtted to the front panel for convenience, and the supplied remote can control the ampliﬁer, any of our matching CD players and basic iPod functionality.

The 650A differs from the 550A by having separate transformer secondaries for left and right channels, twin rectiﬁers and separate PSUs for dual-mono operation of the left and right power ampliﬁers. An even larger heatsink and transformer are also employed which allows for a greater power output of 75wpc (compared to 60wpc for the 550A).

Your ampliﬁer can only be as good as the system it is connected to. Please do not compromise on your source equipment, speakers or cabling. Naturally, we particularly recommend models from the Cambridge Audio Azur range, which have been designed to the same exacting standards as our ampliﬁers. Your dealer can also supply excellent quality Cambridge Audio interconnects to ensure your system realises its full potential.

Thank you for taking the time to read this manual; we recommend you keep it for future reference.

Matthew Bramble

Cambridge Audio Technical Director and the 550A/650A design team

550A, 650A specifications

Cambridge Audio, a revered name in the audio industry, is renowned for producing high-quality amplification solutions. Among its distinguished lineup, the 650A and 550A integrated amplifiers stand out for their exceptional performance and innovative features, making them favorites for both audiophiles and casual listeners.

The Cambridge Audio 650A amplifier is designed to deliver powerful and precise sound, harnessing a robust 75 watts per channel into 8 ohms. This amplifier features an advanced toroidal transformer, which enhances efficiency and reduces electromagnetic interference, ultimately providing cleaner audio. The 650A employs Cambridge's proprietary Class A/B amplifier technology, ensuring a rich and warm sound signature that appeals to lovers of diverse music genres. Additionally, the inclusion of a high-quality headphone output allows for a private listening experience with minimal signal degradation.

In contrast, the 550A model offers a more straightforward approach while still maintaining impressive audio fidelity. Delivering 50 watts per channel into 8 ohms, the 550A is perfect for smaller setups or compact spaces. Its Simple and elegant design hides sophisticated technologies aimed at achieving high-performance output. The amplifier features a high-quality pre-amp section, making it versatile enough to accommodate various audio sources, including vinyl players, CD players, and digital streaming devices.

Both amplifiers feature a solid metal chassis that minimizes vibrations, preserving sound integrity. They also come equipped with multiple inputs, allowing users to connect different sources easily. The 650A and 550A include tone controls to customize the sound signature according to personal preferences, and discrete circuit design to enhance signal clarity further.

Additionally, both amplifiers showcase Cambridge Audio's commitment to user-friendly design principles. With intuitive controls and a clear display, users can enjoy a hassle-free experience, whether adjusting settings or switching sources.

In conclusion, the Cambridge Audio 650A and 550A integrated amplifiers exemplify the brand's dedication to high-quality audio performance. With advanced technologies, robust power, and versatile connectivity, these amplifiers cater to a broad range of listening preferences and environments, ensuring that music is experienced as the artist intended. Whether opt for the powerful 650A or the conveniently efficient 550A, users can expect an unparalleled audio experience that elevates their musical journey.