1. Introduction
Thank you for purchasing the Sansui AU-D707X Integrated Amplifier. This manual provides detailed instructions for the proper setup, operation, and maintenance of your amplifier to ensure optimal performance and longevity. Please read this manual thoroughly before using the unit and keep it for future reference.
The Sansui AU-D707X is a high-fidelity integrated amplifier designed to deliver exceptional audio reproduction. It features robust construction and a comprehensive set of controls for a superior listening experience.
2. Product Overview
Figure 2.1: Front view of the Sansui AU-D707X Integrated Amplifier. This image displays the amplifier's main chassis, featuring a dark finish with wood-grain side panels. The front panel is adorned with various knobs and buttons for input selection, volume control, tone adjustments, and other functions. The central large knob is the master volume control, flanked by smaller knobs for bass, treble, and balance. Input selector buttons are visible on the right side, along with power and speaker selector switches.
The AU-D707X is an integrated amplifier, meaning it combines a preamplifier and a power amplifier into a single unit. This design simplifies your audio system setup while maintaining high-quality sound. Key features include multiple audio inputs, tone controls, and robust power output for driving various speaker types.
3. Setup and Connections
3.1 Unpacking and Placement
- Carefully remove the amplifier from its packaging. Retain all packing materials for future transport or storage.
- Place the amplifier on a stable, level surface away from direct sunlight, heat sources, and excessive moisture.
- Ensure adequate ventilation around the unit. Do not block the ventilation slots on the top or sides of the amplifier. Allow at least 10 cm (4 inches) of clear space above and around the unit.
3.2 Speaker Connections
The AU-D707X supports two pairs of speakers (Speaker A and Speaker B). Ensure your speakers have an impedance rating compatible with the amplifier (typically 4-16 ohms). Refer to the rear panel for specific speaker terminal markings.
- Turn off the amplifier and unplug it from the power outlet before making any connections.
- Connect the positive (+) terminal of your speaker to the positive (+) terminal of the amplifier's speaker output.
- Connect the negative (-) terminal of your speaker to the negative (-) terminal of the amplifier's speaker output.
- Ensure all connections are secure and that no stray wire strands are touching other terminals, which could cause a short circuit.
3.3 Audio Source Connections
Connect your audio components (CD player, turntable, tuner, tape deck, etc.) to the corresponding input jacks on the rear panel using RCA cables.
- CD/AUX: For CD players, digital audio players, or other line-level sources.
- TUNER: For FM/AM tuners.
- PHONO: For turntables. Ensure your turntable is connected to the PHONO input and that the ground wire (if present) is connected to the amplifier's ground terminal.
- TAPE 1/2 (REC/PLAY): For tape decks or other recording devices. Connect the PLAY outputs of your tape deck to the TAPE PLAY inputs on the amplifier, and the REC inputs of your tape deck to the TAPE REC outputs on the amplifier.
3.4 Power Connection
Once all audio and speaker connections are made, plug the amplifier's power cord into a suitable AC power outlet. Ensure the power outlet matches the voltage requirements specified on the amplifier's rear panel.
4. Operating Instructions
4.1 Basic Operation
- Power On/Off: Press the POWER switch on the front panel to turn the amplifier on or off. The power indicator light will illuminate when the unit is on.
- Input Selection: Use the INPUT SELECTOR knob or buttons to choose the desired audio source (e.g., CD, PHONO, TUNER).
- Volume Control: Rotate the large VOLUME knob to adjust the overall listening level. Start with the volume at a low setting before playing audio.
- Speaker Selection: Use the SPEAKER SELECTOR switch to choose between Speaker A, Speaker B, or both (A+B). Ensure at least one speaker pair is selected for sound output.
4.2 Tone Controls
- BASS: Adjusts the low-frequency response. Rotate clockwise to increase bass, counter-clockwise to decrease.
- TREBLE: Adjusts the high-frequency response. Rotate clockwise to increase treble, counter-clockwise to decrease.
- TONE DEFEAT: This button bypasses the tone control circuit for a flatter, more direct sound path. Press it in to activate, press again to deactivate.
4.3 Other Functions
- BALANCE: Adjusts the relative volume between the left and right channels. Set to the center position for equal balance.
- LOUDNESS: This button boosts bass and treble frequencies at low volume levels to compensate for the human ear's reduced sensitivity to these frequencies.
- PHONES: Connect headphones to this jack for private listening. Connecting headphones will typically mute the speaker outputs.
- TAPE MONITOR: Allows you to monitor the signal being recorded by a tape deck connected to the TAPE REC outputs.
5. Maintenance
- Cleaning: Wipe the exterior of the amplifier with a soft, dry cloth. For stubborn dirt, slightly dampen the cloth with water or a mild, non-abrasive cleaner. Do not use harsh chemicals or solvents.
- Ventilation: Regularly check that the ventilation slots are clear of dust and debris. Dust accumulation can lead to overheating.
- Connections: Periodically check all cable connections to ensure they are secure and free from corrosion.
- Storage: If storing the amplifier for an extended period, unplug it from the power outlet and cover it to protect it from dust.
6. Troubleshooting
Before contacting service, please check the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord unplugged; Power switch off; Blown fuse | Ensure power cord is securely plugged in; Turn power switch on; Check and replace fuse if necessary (consult a qualified technician) |
| No sound | Incorrect input selected; Volume too low; Speakers not connected or selected; Mute function active; Headphone connected | Select correct input source; Increase volume; Ensure speakers are connected and selected (A/B); Check if mute is active; Disconnect headphones |
| Distorted sound | Volume too high; Speaker impedance mismatch; Loose speaker wires; Source signal too strong | Reduce volume; Verify speaker impedance; Secure speaker connections; Reduce source output level if adjustable |
| Humming or buzzing noise | Ground loop; Nearby electrical interference; Loose connections | Ensure proper grounding for turntable; Move amplifier away from other electronics; Check all cable connections |
| Sound from only one channel | Balance control off-center; Loose speaker wire; Faulty RCA cable; Speaker issue | Adjust balance control to center; Check speaker wire connections; Try a different RCA cable; Test with another speaker |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Sansui |
| Model | AU-D707X |
| Manufacturer Reference | AU-D707X |
| Product Dimensions (W x D x H) | 50 x 45 x 20 cm |
| Item Weight | 600 g |
| Batteries Required | No |
| First Available Date | May 12, 2014 |
Note: Specifications are subject to change without notice for product improvement.
8. Warranty and Support
For information regarding warranty coverage, service, or technical support for your Sansui AU-D707X Integrated Amplifier, please refer to the warranty card included with your purchase or contact your authorized Sansui dealer or service center. You may also visit the official Sansui website for further assistance.
Keep your purchase receipt as proof of purchase for warranty claims.