1. Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your Cambridge Audio CXA81 MkII Integrated Stereo Amplifier. Please read this manual thoroughly before using the amplifier to ensure proper functionality and to maximize your listening experience. Keep this manual for future reference.
2. What's in the Box
Carefully unpack your CXA81 MkII amplifier. The package should contain the following items:
- CXA81 MKII Integrated Amplifier
- Remote Control (with batteries)
- Power Cable
- Quick Start Guide
- Safety Guide
3. Key Features
The Cambridge Audio CXA81 MkII Integrated Stereo Amplifier offers advanced audio performance and connectivity options:
- 80 Watts Per Channel: Provides ample power to drive a wide range of speakers.
- ESS ES9018K2M SABRE32 DAC: High-quality digital-to-analog conversion for precise audio reproduction.
- Class AB Amplification: Delivers a balanced and efficient audio performance.
- Toroidal Transformer: Contributes to superior sound-staging and dynamic range.
- Digital Inputs: Includes TOSLINK, Coaxial, and USB Audio Input for versatile digital source connectivity.
- Balanced XLR Inputs: Offers premium, low-noise connection for compatible audio sources.
- Bluetooth aptX HD Input: Enables high-resolution wireless audio streaming from compatible devices.
- Roon Tested: Compatible with Roon software when connected via USB to a PC or Mac.
4. Setup
4.1 Placement
Place the amplifier on a flat, stable surface away from direct sunlight, heat sources, and excessive moisture. Ensure adequate ventilation around the unit to prevent overheating. Do not block the ventilation grilles on the top or sides of the amplifier.
Image 1: Angled top view of the CXA81 MkII, highlighting the ventilation grille.
4.2 Connecting Speakers
Connect your speakers to the amplifier's speaker terminals. The CXA81 MkII supports two sets of speakers (A and B). Ensure correct polarity (+ to + and - to -) for each speaker. Use high-quality speaker cables for optimal performance.
Image 2: Rear panel of the CXA81 MkII, illustrating speaker terminals and input/output ports.
4.3 Connecting Audio Sources
The CXA81 MkII offers a variety of input options:
- Analog Inputs (RCA): Connect CD players, tuners, or other analog sources to inputs A1-A4.
- Balanced XLR Input: For high-fidelity analog connections, use the XLR input (A1) with compatible sources.
- Digital Inputs (Optical/Coaxial): Connect digital audio sources like TVs, game consoles, or streaming devices to D1 (Coaxial) or D2 (Optical).
- USB Audio Input: Connect a computer (PC/Mac) via USB for high-resolution audio playback.
- Bluetooth: Pair your Bluetooth-enabled device for wireless audio streaming.
Image 3: Detailed view of the CXA81 MkII's rear connections.
4.4 Power Connection
Once all audio and speaker connections are made, connect the supplied power cable to the amplifier's AC inlet and then to a suitable wall outlet.
5. Operating Instructions
5.1 Powering On/Off
Press the power button on the front panel or the remote control to turn the amplifier on or off. The power indicator will illuminate when the unit is active.
Image 4: Front panel of the CXA81 MkII, displaying controls.
5.2 Input Selection
Use the input selector buttons on the front panel (A1-A4, D1-D2, USB, Bluetooth) or the remote control to choose your desired audio source. The selected input will be indicated on the front display.
5.3 Volume Control
Adjust the volume using the large rotary knob on the front panel or the volume up/down buttons on the remote control. Rotate clockwise to increase volume and counter-clockwise to decrease.
Image 5: Adjusting the volume on the CXA81 MkII.
5.4 Speaker A/B Selection
If you have two sets of speakers connected, use the A/B speaker selection button on the front panel or remote to switch between Speaker A, Speaker B, or both (A+B).
5.5 Bluetooth Pairing
- Select the Bluetooth input on the amplifier.
- On your Bluetooth device, search for available devices and select "Cambridge Audio CXA81 MkII".
- Once paired, audio from your device will stream wirelessly to the amplifier.
5.6 Headphone Output
Connect headphones to the 3.5mm jack on the front panel. Connecting headphones will automatically mute the main speaker outputs.
6. Maintenance
6.1 Cleaning
To clean the amplifier, use a soft, lint-free cloth. Do not use abrasive cleaning agents, waxes, or solvents. Disconnect the amplifier from the power outlet before cleaning.
6.2 Ventilation
Ensure that the ventilation openings on the amplifier are not obstructed. Proper airflow is crucial for maintaining optimal operating temperature and preventing damage to internal components.
7. Troubleshooting
If you encounter issues with your CXA81 MkII, refer to the following common problems and solutions:
- No Power: Check that the power cable is securely connected to both the amplifier and the wall outlet. Ensure the wall outlet is active.
- No Sound:
- Verify that the correct input source is selected.
- Check speaker connections for correct polarity and secure fit.
- Ensure volume is not set to minimum or muted.
- If headphones are connected, disconnect them to enable speaker output.
- Confirm that Speaker A or B (or A+B) is selected.
- Distorted Sound:
- Reduce the volume level.
- Check speaker impedance compatibility with the amplifier.
- Inspect speaker cables for damage or short circuits.
- Bluetooth Connection Issues:
- Ensure the amplifier's Bluetooth input is selected.
- Move your Bluetooth device closer to the amplifier.
- Try unpairing and re-pairing the device.
- Clear Bluetooth memory on your device and the amplifier (refer to the full manual for specific steps if available).
If problems persist, consult the full product manual or contact Cambridge Audio customer support.
8. Specifications
Technical specifications for the Cambridge Audio CXA81 MkII Integrated Stereo Amplifier:
| Specification | Detail |
|---|---|
| Model Number | C11310K |
| Output Power | 80 Watts per channel |
| Number of Channels | 2 |
| DAC | ESS ES9018K2M SABRE32 |
| Bluetooth | aptX HD |
| Mounting Type | Surface Mount |
| Package Dimensions | 21.75 x 16.5 x 8 inches |
| Item Weight | 23.6 Pounds |
9. Warranty and Support
Your Cambridge Audio CXA81 MkII Integrated Stereo Amplifier is covered by a manufacturer's warranty. For detailed information regarding warranty terms, registration, and technical support, please refer to the warranty card included with your product or visit the official Cambridge Audio website. Keep your proof of purchase for warranty claims.
