Introduction
Thank you for choosing the Soundstream Stealth Single Shot ST1.500D Micro Class D Mono Subwoofer Amplifier. This amplifier is designed to provide powerful and efficient amplification for your car audio subwoofer system. Please read this manual thoroughly before installation and operation to ensure proper use and to achieve optimal performance.
Safety Information
- Always disconnect the vehicle's negative battery terminal before beginning any installation.
- Ensure all wiring is properly routed and secured to prevent damage or short circuits.
- Use appropriate gauge wiring for power, ground, and speaker connections as specified in this manual.
- Avoid mounting the amplifier in areas exposed to excessive heat, moisture, or direct sunlight.
- Consult a professional car audio installer if you are unsure about any part of the installation process.
- This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Package Contents
Verify that your package contains the following items:
- Soundstream Stealth Single Shot ST1.500D Amplifier
- Mounting Hardware
- User Manual (this document)
Features
- Micro Class D Topology for high efficiency and compact size.
- Mono Channel Output for dedicated subwoofer amplification.
- Variable Low Pass Crossover for precise frequency tuning.
- Adjustable Gain Control to match head unit output.
- High-Level Input capability for integration with factory head units.
Specifications
| Specification | Value |
|---|---|
| Model Number | ST1.500D |
| Output Power | 500 Watts (Max) |
| RMS Power @ 2 Ohms | 150W |
| Number of Channels | 1 (Mono) |
| Voltage | 12 Volts (DC) |
| Item Dimensions (L x W x H) | 3.75 x 3 x 1.5 inches |
| Item Weight | 1.1 pounds |
| Mounting Type | Surface Mount |
| Specification Met | CE |
Installation
Proper installation is crucial for the performance and longevity of your amplifier. Follow these steps carefully:
1. Mounting Location
Choose a mounting location that is dry, well-ventilated, and away from direct heat sources. Ensure there is enough space for proper air circulation around the amplifier. The compact size of the ST1.500D allows for flexible mounting options, such as under a seat or behind a panel.
2. Power Wiring
- Power (B+) Wire: Connect a suitable gauge power wire (e.g., 8-gauge or 10-gauge) directly from the positive terminal of your vehicle's battery to the B+ terminal on the amplifier. Install an in-line fuse holder with an appropriate fuse (not exceeding the amplifier's rating) within 18 inches of the battery.
- Ground (GND) Wire: Connect a ground wire of the same gauge as the power wire from the GND terminal on the amplifier to a clean, unpainted metal surface on the vehicle's chassis. Ensure a solid, low-resistance connection.
- Remote (REM) Turn-On Wire: Connect a remote turn-on wire (typically 18-gauge) from your head unit's remote output to the REM terminal on the amplifier. This wire signals the amplifier to turn on and off with your head unit. If using high-level inputs, some amplifiers may have a DC offset or audio sense turn-on feature, eliminating the need for a separate remote wire.
3. Signal Input
- RCA Input (Low-Level): If your head unit has RCA pre-outs, connect them to the RCA input jacks on the amplifier using high-quality RCA cables.
- High-Level Input: If your head unit does not have RCA pre-outs, use the high-level input feature. Connect the speaker wires from your head unit's speaker outputs directly to the high-level input terminals on the amplifier. Refer to the amplifier's specific wiring diagram for correct polarity.
4. Speaker Output
Connect your subwoofer(s) to the speaker output terminals on the amplifier. Ensure correct polarity (+ to + and - to -) and verify that the total impedance of your subwoofer configuration matches the amplifier's recommended load (e.g., 2 Ohms for optimal power output).
Image: The Soundstream Stealth Single Shot ST1.500D Micro Class D Mono Subwoofer Amplifier. This image shows the compact design of the amplifier, which facilitates flexible installation in various vehicle spaces.
Controls and Adjustments
The ST1.500D amplifier features several controls to fine-tune its performance:
- Gain Control: This knob adjusts the input sensitivity of the amplifier. Set it to match the output voltage of your head unit. Start with the gain at minimum and slowly increase it until you hear distortion, then back off slightly.
- Low Pass Filter (LPF): This control sets the upper frequency limit for the subwoofer. Frequencies above this setting will be filtered out. Typically, this is set between 80Hz and 120Hz, depending on your subwoofer and other speakers.
- Bass Boost: This control allows you to increase the bass output at a specific frequency. Use sparingly to avoid distortion and potential damage to your subwoofer.
Operating Instructions
Once installed and configured, operating your amplifier is straightforward:
- Turn on your vehicle's ignition and head unit. The amplifier should power on automatically via the remote turn-on wire.
- Play audio through your head unit.
- Adjust the volume on your head unit to a comfortable listening level.
- Fine-tune the amplifier's gain, LPF, and bass boost settings as needed for optimal sound quality and bass response.
Troubleshooting
If you encounter issues, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Amplifier Not Turning On | Blown fuse, loose power/ground/remote wire, faulty remote turn-on signal. | Check the in-line fuse, verify all power, ground, and remote connections are secure and receiving proper voltage. Test the remote wire for 12V when the head unit is on. |
| No Sound Output | No input signal, incorrect gain setting, speaker wires disconnected, amplifier in protection mode. | Check RCA or high-level input connections. Ensure gain is not at minimum. Verify speaker wire connections and polarity. If the protection LED is on, refer to the amplifier's specific protection indicators. |
| Distorted Sound | Gain set too high, incorrect crossover settings, damaged speaker/subwoofer. | Reduce the gain setting. Adjust the LPF. Inspect the subwoofer for physical damage. |
| Excessive Heat | Insufficient ventilation, impedance mismatch, prolonged high-volume use. | Ensure adequate airflow around the amplifier. Verify subwoofer impedance matches amplifier rating. Reduce listening volume or duration. |
Maintenance
The Soundstream ST1.500D amplifier requires minimal maintenance:
- Periodically check all wiring connections to ensure they are secure.
- Keep the amplifier clean and free of dust and debris. Use a soft, dry cloth for cleaning.
- Ensure the amplifier's cooling fins (if present) are not obstructed.
Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or visit the official Soundstream website. Keep your purchase receipt as proof of purchase for warranty claims.
