1. Introduction
The Altronix ALSD1 is a 2-channel siren driver designed to convert a low-level audio input into a high-power output suitable for driving sirens. It operates within a voltage range of 6Vdc to 12Vdc, making it versatile for various security and alarm system applications. This manual provides essential information for the proper installation, operation, and maintenance of your ALSD1 siren driver.

Figure 1: Front view of the Altronix ALSD1 Siren Driver, showing its compact design and connection terminals.
2. Setup and Installation
Proper installation is crucial for the optimal performance of the ALSD1 siren driver. Follow these steps carefully:
- Mounting: Securely mount the ALSD1 in a dry, protected area, away from direct sunlight and extreme temperatures. Use appropriate fasteners for the mounting surface.
- Power Connection: Connect a 6-12Vdc power source to the designated power input terminals. Ensure correct polarity: positive (+) to positive, and negative (-) to negative. Incorrect polarity can damage the unit.
- Audio Input: Connect the audio output from your alarm control panel or signal source to the ALSD1's audio input terminals. Refer to your alarm panel's manual for specific audio output connections.
- Siren Output: Connect your sirens to the ALSD1's siren output terminals. The ALSD1 supports two channels, allowing for connection of one or two sirens. Observe correct polarity for each siren. Ensure the sirens are compatible with the driver's output specifications.
Important: Always disconnect power before making any wiring connections to prevent electrical shock or damage to the device.
3. Operating Instructions
The ALSD1 siren driver operates automatically once correctly installed and powered. It functions as follows:
- Upon receiving an audio signal from the connected alarm control panel, the ALSD1 amplifies this signal.
- The amplified signal is then sent to the connected sirens via the two output channels.
- The siren sound pattern and duration are determined by the audio input signal provided by your alarm control panel. The ALSD1 acts as an amplifier and driver, not a signal generator.
4. Maintenance
The Altronix ALSD1 siren driver is designed for reliable operation with minimal maintenance. To ensure continued performance:
- Periodic Inspection: Regularly inspect all wiring connections to ensure they remain secure and free from corrosion. Loose connections can lead to intermittent operation or failure.
- Cleaning: Keep the unit free from dust and debris. Use a soft, dry cloth for cleaning. Do not use liquid cleaners or solvents.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent damage.
Note: There are no user-serviceable parts inside the ALSD1. Do not attempt to open or repair the unit, as this will void the warranty.
5. Troubleshooting
If you encounter issues with your ALSD1 siren driver, refer to the following troubleshooting guide:
- No Siren Sound:
- Verify that the power supply (6-12Vdc) is correctly connected and providing adequate voltage.
- Ensure the audio input signal from the alarm panel is present and correctly wired.
- Check the siren connections for proper polarity and secure contact.
- Test the siren directly with a known good power source to confirm its functionality.
- Weak or Distorted Sound:
- Confirm the power supply voltage is within the specified 6-12Vdc range.
- Ensure the connected sirens are compatible with the driver's output specifications (e.g., impedance).
- Check the audio input signal strength from the alarm panel.
- Intermittent Operation:
- Inspect all wiring for loose connections or damaged insulation.
- Ensure the power supply is stable and not fluctuating.
If the problem persists after following these steps, contact Altronix technical support.
6. Specifications
| Model | ALSD1 |
| Input Voltage | 6-12Vdc |
| Channels | 2 |
| Brand | Altronix |
| Weight | Approximately 0.01 Ounces (0.28 grams) |
7. Warranty and Support
Altronix products are backed by a limited warranty. For detailed warranty information, including terms and conditions, please visit the official Altronix website or consult the documentation provided with your purchase. For technical assistance, product inquiries, or to report a problem, please contact Altronix customer support directly. When contacting support, please have your product model number (ALSD1) and purchase details available.
Altronix Contact Information:
Refer to the official Altronix website for the most current contact details, including phone numbers and email addresses for technical support.