1. Introduction
Thank you for purchasing the OSD Audio SMP500DSP Subwoofer Amplifier. This manual provides detailed instructions for the proper installation, operation, and maintenance of your amplifier. Please read this manual thoroughly before using the product to ensure optimal performance and safety.
The OSD Audio SMP500DSP is a high-performance mono-channel Class D subwoofer amplifier designed to deliver powerful and clear low-frequency sound. It is ideal for enhancing the bass response in dedicated home theater systems and media rooms.
2. Key Features
- Power Output: Up to 800 watts peak / 400 watts RMS at 4 ohms, utilizing highly efficient Class D technology for cool operation.
- DSP (Digital Signal Processing): Onboard DSP for precise audio control and optimization.
- Variable High-Cut Filter: Adjustable filter to route higher frequencies to main speakers, improving low-frequency effects.
- Control Features: Front-mounted power, back panel adjustable gain, and a volume control limiter to protect woofers.
- Input/Output Flexibility: Low and high-level pass-through inputs/outputs for versatile connectivity.
- Auto Sensing: Automatic power on/off when an audio signal is detected.
- Design: Rack-mountable chassis for easy integration into existing setups.
- Voltage: Dual 100/220 voltage compatibility.
- Certifications: CE & ETL rated.
- Included Accessories: Remote control for convenient operation.
3. Product Overview
Familiarize yourself with the front and rear panels of the SMP500DSP amplifier.
Figure 3.1: Front and Rear Panel Overview of the SMP500DSP Amplifier. This image displays both the front panel with its display and control knob, and the rear panel showing all input/output connections and power switch.
Figure 3.2: Front Panel of the SMP500DSP Amplifier. This view highlights the power button, service port, digital display, and main volume/control knob.
Figure 3.3: Rear Panel of the SMP500DSP Amplifier. This image shows the various input and output terminals, including RCA line inputs/outputs, speaker level inputs/outputs, 12V trigger, and the AC voltage selector.
Front Panel Controls:
- Power Button: Turns the amplifier on or off.
- Service Port: Used for firmware updates and diagnostics.
- Digital Display: Shows current settings such as volume level and DSP parameters.
- Control Knob: Adjusts volume and navigates DSP menu options.
Figure 3.4: Detail of the Front Panel Display and Control Knob. This close-up shows the digital readout indicating volume and the tactile control knob for adjustments.
Rear Panel Connections:
- Line In (RCA): Stereo RCA inputs for connecting to a pre-amplifier or receiver.
- Line Out (RCA): Stereo RCA outputs for daisy-chaining to another amplifier or audio device.
- Speaker Level In/Out: High-level inputs and outputs for connecting directly to speaker outputs from a receiver or amplifier.
- 12V Trigger In/Out: For integration with home automation systems, allowing the amplifier to turn on/off with other equipment.
- Music On 12V Switch: Selects between music sensing or 12V trigger for auto-on functionality.
- Subwoofer Speaker Output: Binding posts for connecting your passive subwoofer. Supports Class 2 wiring, 4Ω.
- AC Voltage Selector: Switch to select between 110V and 220V operation. Ensure this is set correctly for your region before connecting power.
- AC Power Inlet: For connecting the included power cord.
Figure 3.5: Detail of Subwoofer Speaker Output Terminals. This image focuses on the binding posts used for connecting the subwoofer speaker cables.
Figure 3.6: Detail of RCA and Speaker Level Inputs/Outputs. This close-up shows the various audio input and output options available on the rear panel.
4. Setup and Installation
4.1 Safety Precautions
- Always ensure the amplifier is disconnected from the power outlet before making any connections.
- Verify the AC Voltage Selector switch on the rear panel is set to the correct voltage for your region (110V or 220V) before plugging in the amplifier. Incorrect voltage selection can cause severe damage to the unit.
- Do not expose the amplifier to moisture or extreme temperatures.
- Ensure adequate ventilation around the amplifier to prevent overheating.
4.2 Placement
The SMP500DSP amplifier can be placed on a flat surface or rack-mounted. Choose a location that is dry, well-ventilated, and away from direct sunlight or heat sources. Allow sufficient space around the unit for airflow.
4.3 Connecting Your Subwoofer
- Ensure the amplifier is powered off and unplugged.
- Connect your passive subwoofer to the "Subwoofer Speaker Output" binding posts on the rear panel. Ensure correct polarity (+ to + and – to –).
- The SMP500DSP supports a single 4-8 ohm subwoofer or two 8-ohm subwoofers.
4.4 Connecting to Your Audio System
There are two primary methods for connecting the SMP500DSP to your audio system:
Method A: Using RCA Line Level Inputs (Recommended)
- If your receiver or pre-amplifier has a dedicated subwoofer or LFE (Low-Frequency Effects) output, connect an RCA cable from that output to the "Line In" (L or R, or both for stereo) on the SMP500DSP.
- If your source has stereo RCA outputs, connect both L and R outputs to the "Line In" L and R on the amplifier.
Method B: Using Speaker Level Inputs
- If your receiver does not have a dedicated subwoofer output, you can connect the speaker outputs of your receiver to the "Speaker Level In" terminals on the SMP500DSP.
- Connect the main left and right speaker outputs from your receiver to the corresponding "Speaker Level In" terminals on the amplifier. Ensure correct polarity.
- You can then use the "Speaker Level Out" terminals to connect to your main left and right speakers, allowing the amplifier to pass through the full range signal.
4.5 Power Connection
- Double-check the AC Voltage Selector switch on the rear panel is set correctly (110V or 220V).
- Connect the included power cord to the AC Power Inlet on the rear panel of the amplifier.
- Plug the other end of the power cord into a suitable wall outlet.
5. Operation
5.1 Powering On/Off
- Press the Power button on the front panel to turn the amplifier on or off. The power indicator LED will illuminate when the unit is on.
- Auto Sensing: The amplifier features an auto-sensing function. When the "Music On 12V" switch is set to "Music On", the amplifier will automatically turn on when an audio signal is detected and enter standby mode after approximately 20 minutes of no signal.
- 12V Trigger: If using the 12V trigger, set the "Music On 12V" switch to "12V". The amplifier will power on/off in sync with your connected equipment.
5.2 Adjusting Volume
Rotate the large control knob on the front panel to adjust the subwoofer's volume level. The digital display will show the current volume setting.
5.3 DSP Control and Settings
The SMP500DSP features onboard DSP for advanced audio customization. Use the control knob to navigate the DSP menu on the digital display. Press the knob to select options and rotate to change values.
Key DSP settings include:
- High-Cut Filter (Crossover): Adjusts the upper frequency limit of the subwoofer. This allows you to blend the subwoofer's output seamlessly with your main speakers. Typical settings range from 30Hz to 150Hz.
- Phase Control: Adjusts the phase of the subwoofer output (0° or 180°). This helps to ensure that the subwoofer's sound waves align correctly with your main speakers, preventing cancellation or reinforcement issues.
- Gain/Level: Fine-tunes the input sensitivity to match the output level of your source device.
- Volume Control Limiter: Sets a maximum volume level to prevent accidental overdriving of the subwoofer.
Refer to the on-screen DSP menu for specific navigation and adjustment instructions.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or aerosols.
- Ventilation: Ensure that the ventilation openings on the amplifier are not blocked. Dust accumulation can be removed with a soft brush or vacuum cleaner.
- Connections: Periodically check all cable connections to ensure they are secure and free from corrosion.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected; AC Voltage Selector incorrect; Power outlet faulty. | Ensure power cord is securely plugged in. Verify AC Voltage Selector is set correctly (110V/220V). Try a different power outlet. |
| No sound from subwoofer | Incorrect input connection; Subwoofer cable loose/incorrect polarity; Volume too low; DSP settings incorrect. | Check all audio connections (RCA/speaker level). Ensure subwoofer cables are connected with correct polarity. Increase amplifier volume. Check DSP settings (e.g., gain, crossover). |
| Distorted sound | Volume too high; Input signal too strong; Subwoofer impedance mismatch. | Reduce amplifier volume. Adjust gain settings. Ensure subwoofer impedance matches amplifier specifications (4-8 ohms). |
| Amplifier turns off unexpectedly | Overheating; Auto-sensing timeout; Faulty power supply. | Ensure adequate ventilation. Check "Music On 12V" switch setting. If problem persists, contact customer support. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | SMP500DSP |
| Output Power | 800W Peak / 400W RMS @ 4 Ohms |
| Amplifier Type | Mono-Channel Class D |
| Number of Channels | 1 |
| DSP | Onboard Digital Signal Processing |
| Voltage | 100V/220V Switchable |
| Item Dimensions (L x W x H) | 15 x 5 x 6 inches |
| Item Weight | 8 pounds |
| Mounting Type | Surface Mount / Rack Mountable |
| High-Cut Filter | Variable (30Hz - 150Hz) |
| Auto-On Sensitivity | 5 mV |
| Auto-Off Time | 20 minutes (no signal) |
| Total Harmonic Distortion (THD) | <1% |
| Certifications | CE, ETL Rated |
| UPC | 819603013177 |
9. Warranty and Support
9.1 Warranty Information
OSD Audio products are designed and manufactured to the highest quality standards. For specific warranty details regarding your SMP500DSP amplifier, please refer to the warranty card included with your product or visit the official OSD Audio website.
Generally, OSD Audio provides a limited warranty against defects in materials and workmanship under normal use. This warranty typically covers parts and labor for a specified period from the original date of purchase.
9.2 Customer Support
If you encounter any issues or have questions regarding your OSD Audio SMP500DSP amplifier that are not covered in this manual, please contact OSD Audio customer support:
- Website: www.osdaudio.com
- Contact Information: Refer to the "Contact Us" section on the official website for phone numbers and email support.
When contacting support, please have your product model number (SMP500DSP) and purchase information ready.
