1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Atlas Sound 100W Commercial Attenuator, Model AT-100. This device is designed to provide precise volume control for 25V and 70V constant voltage audio distribution systems.
2. Safety Information
Always observe the following safety precautions to prevent injury and damage to the equipment:
- Disconnect power to the audio system before installation or servicing.
- Ensure all wiring connections are secure and comply with local electrical codes.
- Do not exceed the maximum power rating of 100 watts.
- This attenuator is designed for indoor use only.
- If you are unsure about any installation steps, consult a qualified electrician or audio technician.
3. Product Overview
The Atlas Sound AT-100 is a robust 100-watt commercial attenuator featuring a stainless steel plate for durability and aesthetic integration into various environments. It offers precise volume reduction in 3 dB steps, providing a total attenuation of 27 dB, plus a positive off position.
Key Features:
- 100 Watt power handling capacity.
- 3 dB attenuation per step for fine volume adjustment.
- 27 dB total attenuation range.
- Positive off position to prevent switch damage and ensure complete silence.
- Low insertion loss of 0.6 dB.
- Designed for 25V and 70V constant voltage audio systems.
- Standard single-gang plate size with included stainless steel plate.
This image shows the front view of the Atlas Sound AT-100 Commercial Attenuator, featuring its stainless steel faceplate and the rotary control knob. The knob is marked with attenuation levels, indicating its function as a volume control device.
4. Setup and Installation
The AT-100 attenuator is designed for installation in a standard single-gang electrical box. Ensure the electrical box has sufficient depth to accommodate the attenuator's transformer and wiring connections.
4.1 Components Included:
- Atlas Sound AT-100 Attenuator module
- Stainless steel faceplate
- Control knob
- Mounting screws
4.2 Wiring Instructions:
- Power Disconnection: Before beginning, ensure that all power to the audio system is turned off at the circuit breaker.
- Mounting: Install the attenuator module into a standard single-gang electrical box. Secure it using the provided mounting screws.
- Input Wiring: Connect the audio input wires from your amplifier (25V or 70V constant voltage line) to the designated input terminals on the attenuator. Refer to the wiring diagram on the unit or in the detailed instructions for correct polarity.
- Output Wiring: Connect the audio output wires from the attenuator to your speaker(s). Ensure correct polarity.
- Faceplate Installation: Once wiring is complete and verified, attach the stainless steel faceplate over the attenuator and secure it with the decorative screws.
- Knob Attachment: Push the control knob onto the attenuator shaft until it is firmly seated.
This image displays several angles of the Atlas Sound AT-100 attenuator, highlighting the rear of the unit where the wiring terminals are located. It also shows the removable green connector block, which facilitates easier wiring connections for the 25V or 70V audio systems.
5. Operating Instructions
The Atlas Sound AT-100 attenuator provides simple and intuitive volume control for your audio system.
- Power On: After installation, restore power to the audio system.
- Volume Adjustment: Rotate the control knob clockwise to increase the volume and counter-clockwise to decrease the volume. Each click represents a 3 dB change in attenuation.
- Positive Off Position: Continue rotating the knob counter-clockwise past the lowest numbered setting to reach the 'OFF' position. This feature ensures a complete signal cut-off and prevents potential damage to the internal switch mechanism by eliminating a hard stop at the minimum volume setting.
6. Maintenance
The Atlas Sound AT-100 attenuator requires minimal maintenance to ensure long-term performance.
- Cleaning: Periodically wipe the stainless steel faceplate with a soft, dry cloth to remove dust and smudges. Avoid using abrasive cleaners or solvents.
- Inspection: Annually inspect the wiring connections for any signs of loosening or corrosion. Ensure the control knob operates smoothly.
- No User-Serviceable Parts: The internal components of the attenuator are not user-serviceable. Do not attempt to open or repair the unit.
7. Troubleshooting
If you encounter issues with your AT-100 attenuator, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speaker | Attenuator in 'OFF' position; incorrect wiring; amplifier issue; speaker issue. | Rotate knob clockwise; check all wiring connections; verify amplifier and speaker functionality. |
| Distorted sound | Overloaded attenuator (exceeding 100W); faulty wiring; amplifier distortion. | Ensure total speaker wattage does not exceed 100W; check wiring; test amplifier independently. |
| Volume not changing | Faulty attenuator; loose knob. | Ensure knob is firmly seated; if issue persists, contact support. |
If the problem persists after attempting these solutions, contact Atlas Sound customer support or a qualified technician.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | AT-100 |
| Power Rating | 100 Watts |
| Attenuation Steps | 3 dB per step |
| Total Attenuation | 27 dB plus positive off |
| Insertion Loss | 0.6 dB |
| System Compatibility | 25V and 70V constant voltage systems |
| Plate Size | Single-gang |
| Plate Material | Stainless Steel |
| Product Dimensions (H x W x D) | 4.6 x 3 x 3.7 inches |
| Item Weight | 15.5 ounces |
| Manufacturer | Atlas Sound |
| Date First Available | August 10, 2004 |
9. Warranty and Support
For warranty information and technical support, please contact Atlas Sound directly. Retain your proof of purchase for any warranty claims.
Atlas Sound Contact Information:
Please refer to the official Atlas Sound website or product packaging for the most current contact details.