Auna CD708 Home Stereo Amplifier User Manual

1. Introduction

Thank you for choosing the Auna CD708 Home Stereo Amplifier. This amplifier is designed to provide high-quality audio reproduction for your home entertainment system. Featuring a robust brushed aluminum front panel and versatile connectivity options, it offers an excellent listening experience. Please read this manual carefully before using the device to ensure proper operation and to maximize its performance.

2. Safety Instructions

To prevent fire, electric shock, and injury, always follow these basic safety precautions:

• Read all instructions before operating the appliance.
• Keep the appliance away from water or moisture.
• Do not place the appliance near heat sources such as radiators, heat registers, stoves, or other heat-producing appliances.
• Ensure proper ventilation. Do not block any ventilation openings.
• Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the appliance.
• Only use attachments/accessories specified by the manufacturer.
• Unplug this appliance during lightning storms or when unused for long periods.
• Refer all servicing to qualified service personnel. Servicing is required when the appliance has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the appliance, the appliance has been exposed to rain or moisture, does not operate normally, or has been dropped.

3. Package Contents

Carefully unpack your Auna CD708 amplifier and ensure all items are present:

• 1 x Auna CD708 Stereo Amplifier Unit
• 1 x Remote Control
• 1 x 3.5mm Jack to Stereo RCA Cable
• 1 x User Manual (German, English)

4. Product Overview

The Auna CD708 features a sleek design with a brushed aluminum front panel and a comprehensive set of connections on the rear. Familiarize yourself with the various controls and ports before setup.

Front Panel Controls

• Power Button: Turns the amplifier on or off.
• Input Selector: Cycles through available audio inputs (CD, Tuner, AUX, DVD, Phono).
• Volume Control: Adjusts the overall output volume.
• Tone Controls: Bass, Midrange, and Treble knobs for sound equalization.
• Balance Control: Adjusts the left/right channel balance.
• Speaker Selector (A/B): Selects speaker output A, B, or A+B.
• Headphone Jack (6.3mm): For private listening.

Rear Panel Connections

• RCA Audio Inputs: Dedicated inputs for CD, Tuner, AUX, DVD, and Phono sources.
• RCA Audio Output: For connecting to other audio devices.
• Speaker Terminals: Four terminals for connecting two pairs of speakers (A and B).
• Power Input: Connects to the AC power supply.
• Rear Power Switch: Main power cut-off switch.

Figure 1: Front view of the Auna CD708 Home Stereo Amplifier, showcasing its silver finish and control knobs.

5. Setup

Follow these steps to set up your Auna CD708 amplifier:

1. Placement: Place the amplifier on a stable, flat surface with adequate ventilation. Avoid placing it near heat sources or in direct sunlight.
2. Speaker Connection: Connect your passive speakers to the speaker terminals on the rear panel. Ensure correct polarity (+ to + and - to -) for each speaker. You can connect one pair (A), a second pair (B), or both (A+B). The amplifier supports speakers with an impedance of 8-16 ohms.
3. Audio Source Connection: Connect your audio sources (e.g., CD player, tuner, DVD player, turntable, AUX device) to the corresponding RCA input jacks on the rear panel. Use high-quality RCA cables for optimal sound.
4. Power Connection: Ensure the rear power switch is in the OFF position. Connect the power cord to the amplifier's power input and then to a suitable AC 230V, 50Hz power outlet.
5. Remote Control Battery: Open the battery compartment of the remote control and insert one CR2025 battery, observing the correct polarity.

6. Operating Instructions

Once set up, operating your Auna CD708 amplifier is straightforward:

1. Power On: Flip the rear power switch to the ON position. Then, press the front panel Power button or the Power button on the remote control to turn on the amplifier. The Power LED will illuminate.
2. Select Input Source: Use the Input Selector knob on the front panel or the corresponding buttons on the remote control to choose your desired audio source (CD, Tuner, AUX, DVD, Phono).
3. Adjust Volume: Rotate the Volume knob on the front panel or use the Volume +/- buttons on the remote control to set the desired listening level. Start with a low volume and gradually increase it.
4. Speaker Selection: Use the A/B speaker selector buttons on the front panel to choose which pair of speakers (A, B, or A+B) you wish to use.
5. Tone Control: Adjust the Bass, Midrange, and Treble knobs to fine-tune the sound to your preference. The Balance knob can be used to adjust the left/right channel output.
6. Headphone Use: Plug your 6.3mm headphones into the headphone jack on the front panel for private listening. This will typically mute the speaker output.
7. Power Off: Press the Power button on the front panel or remote control to put the amplifier into standby mode. For complete power disconnection, turn off the rear power switch.

7. Maintenance

To ensure the longevity and optimal performance of your amplifier, follow these maintenance guidelines:

• Cleaning: Disconnect the power before cleaning. Use a soft, dry cloth to wipe the exterior surfaces. Do not use liquid cleaners, aerosols, or abrasive materials, as they may damage the finish.
• Ventilation: Ensure that the ventilation openings are not blocked by dust or debris. Periodically clean the vents with a soft brush or vacuum cleaner.
• Storage: If storing the amplifier for an extended period, disconnect it from power and store it in a cool, dry place, away from direct sunlight and extreme temperatures.

8. Troubleshooting

If you encounter any issues with your Auna CD708 amplifier, refer to the following common problems and solutions:

• No Power:
  • Check if the power cord is securely connected to both the amplifier and the wall outlet.
  • Ensure the rear power switch is in the ON position.
  • Verify the wall outlet is functioning by plugging in another device.
• No Sound:
  • Confirm the correct input source is selected.
  • Check all audio cable connections between the source device and the amplifier.
  • Ensure speakers are correctly connected and the speaker selector (A/B) is set appropriately.
  • Increase the volume level.
  • If headphones are plugged in, unplug them to enable speaker output.
• Remote Control Not Working:
  • Check and replace the CR2025 battery if necessary, ensuring correct polarity.
  • Ensure there are no obstructions between the remote control and the amplifier's IR sensor.
  • Point the remote directly at the amplifier.
• Distorted Sound:
  • Reduce the volume level.
  • Check if the audio source is providing a clean signal.
  • Ensure speaker impedance matches the amplifier's requirements (8-16 ohms).

If the problem persists after trying these solutions, please contact customer support.

9. Specifications

10. Warranty and Support

For warranty information and customer support, please refer to the separate warranty document included with your purchase or visit the official Auna website. Keep your proof of purchase for any warranty claims.