1. Introduction
Thank you for choosing the OMNITRONIC SMA-2000 Stereo Power Amplifier. This manual provides essential information for the safe and efficient operation of your device. Please read it thoroughly before use and keep it for future reference.
The SMA-2000 is a high-performance stereo power amplifier designed for professional audio applications, offering robust power output, reliable protection features, and versatile connectivity.
2. Safety Instructions
- Always connect the amplifier to a grounded power outlet.
- Do not expose the unit to rain or moisture to prevent fire or electric shock.
- Ensure proper ventilation. Do not block ventilation openings.
- Do not open the amplifier casing. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Disconnect the power cord before cleaning or when not in use for extended periods.
- Avoid placing the unit near heat sources or in direct sunlight.
- Use only specified voltage (230 V AC, 50 Hz).
3. Setup
3.1 Unpacking and Inspection
Carefully unpack the amplifier and inspect it for any signs of damage during transit. If damage is found, do not operate the unit and contact your dealer immediately.
3.2 Placement
Place the amplifier on a stable, flat surface or mount it in a standard 19-inch equipment rack. Ensure adequate space around the unit for proper airflow and cooling. Avoid placing it directly on carpet or other soft surfaces that could block ventilation.
Figure 3.2.1: SMA-2000 amplifier shown mounted in a standard 19-inch equipment rack, demonstrating proper installation for optimal ventilation and integration into a professional audio setup.
3.3 Connections
Refer to the rear panel diagram for input and output connections.
Figure 3.3.1: Rear panel of the SMA-2000 amplifier, highlighting the various input and output connectors including XLR, RCA, and speaker terminals. This view is crucial for understanding how to properly connect audio sources and speakers.
- Audio Inputs: Connect your audio source (mixer, preamplifier) to the CH1 INPUT and CH2 INPUT using XLR or RCA cables.
- Speaker Outputs: Connect your speakers to the SPEAKER OUTPUT terminals. Ensure correct polarity (+ to + and - to -). The amplifier supports stereo speaker output and screw terminals.
- Power Connection: Connect the amplifier to a suitable 230 V AC, 50 Hz power outlet using the provided power cable.
- Loop-through Output: Use the XLR pass-through (stereo RCA/Jack) for connecting to additional amplifiers or audio devices.
4. Operating
The front panel of the SMA-2000 features controls and indicators for easy operation.
Figure 4.1.1: Front panel of the SMA-2000 amplifier, displaying the power switch, channel volume controls, and LED indicators for Protect, Clip, and Signal status. This is the primary interface for controlling and monitoring the amplifier's operation.
4.1 Powering On/Off
Press the POWER switch on the front panel to turn the amplifier ON or OFF. A soft start function is integrated to protect connected equipment.
4.2 Volume Control
Adjust the volume for each channel (CH1 and CH2) using the respective rotary controls on the front panel.
4.3 Mode Selection
On the rear panel, use the mode selector switch to choose between:
- Stereo: Independent operation of both channels.
- Parallel: Input signal is sent to both channels, useful for driving multiple speakers with the same signal.
- Bridge: Combines both channels for mono operation, delivering maximum power to a single speaker.
4.4 Sensitivity Switch
The input sensitivity switch (26 dB / 32 dB) on the rear panel allows you to match the amplifier's input level to your audio source's output level.
4.5 LED Indicators
- SIGNAL: Illuminates when an audio signal is present on the respective channel.
- CLIP: Illuminates when the input signal is too high, indicating potential distortion. Reduce the input level or volume.
- PROTECT: Illuminates when a protection circuit is activated (e.g., short circuit, overheating, DC voltage). The amplifier will mute output to prevent damage. Turn off the unit, resolve the issue, and then power on again.
- PARALLEL/BRIDGE: Indicates the selected operating mode.
5. Maintenance
5.1 Cleaning
Clean the amplifier's exterior with a soft, dry cloth. Do not use liquid cleaners or solvents. Ensure ventilation grilles are free of dust and debris to maintain optimal cooling.
5.2 Storage
If storing the amplifier for an extended period, disconnect it from power and store it in a cool, dry place, away from direct sunlight and extreme temperatures.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable disconnected; no power from outlet; blown fuse. | Check power cable connection; test outlet; replace fuse (if accessible and safe to do so, otherwise contact service). |
| No sound output | Input cables disconnected; speaker cables disconnected/incorrectly wired; volume too low; PROTECT LED illuminated. | Check all cable connections; ensure correct speaker polarity; increase volume; if PROTECT LED is on, refer to its description in Section 4.5. |
| Distorted sound / CLIP LED on | Input signal too high; amplifier overloaded. | Reduce input level from source; reduce amplifier volume. |
| PROTECT LED illuminated | Overheating; short circuit in speaker cables; DC voltage detected. | Ensure proper ventilation; check speaker cables for shorts; turn off amplifier, wait for it to cool down, then restart. If problem persists, seek professional service. |
7. Specifications
| Parameter | Value |
|---|---|
| Power Supply | 230 V AC, 50 Hz |
| Power Consumption | 575 W (1/8 power) |
| Output Power (Stereo 4 Ohm) | 2 x 1000 W |
| Output Power (Stereo 8 Ohm) | 2 x 637 W |
| Output Power (8 Ohm Bridged) | 1 x 2000 W |
| Frequency Range | 20 – 20,000 Hz, ± 0.5 dB |
| Damping Factor | > 200 |
| Distortion Factor | 0.05% |
| Slew Rate | > 20 V/µs |
| Signal-to-Noise Ratio | > 90 dB |
| Channel Separation | > 70 dB / 1 kHz |
| Input Sensitivity | 26 dB / 32 dB (3.46 V / 1.73 V), switchable |
| Voltage Gain | 26 dB / 32 dB |
| Input Impedance | 20 kOhm (unbalanced), 10 kOhm (balanced) |
| Output Impedance | > 2 Ohm |
| Circuitry | Class H |
| Protection Circuits | Short circuit, overheating, DC voltage, VHF signals, Soft Start |
| Construction | Steel chassis |
| Dimensions (W x D x H) | 483 x 390 x 92 mm (19", 2U) |
| Weight | 9 kg |
| Item Model Number | 10451088 |
8. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact your Omnitronic dealer. Keep your proof of purchase for any warranty claims.