SK-790.4 4-Channel Car Amplifier
User Manual
Introduction
Welcome to the user manual for the SK-790.4, a powerful 4-channel car amplifier designed to enhance your vehicle's audio experience. This manual provides essential information for installation, operation, and maintenance to ensure optimal performance and longevity of your amplifier.
Key Features
- 4-Channel Configuration: Delivers robust audio output for multiple speakers.
- 12V Operation: Designed for standard automotive power systems.
- Class A/B Topology: Offers a balance of sound quality and efficiency.
- High Power Output: Maximum power rating of 7900W for impressive audio performance.
- Digital Stereo & Surround Sound: Supports advanced audio playback modes.
- Passive Subwoofer Support: Enables integration of passive subwoofers for enhanced bass.
- Versatile Audio Player: Functions as a comprehensive car audio player.
Specifications
The following table outlines the technical specifications for the SK-790.4 amplifier.
| Specification | Value |
|---|---|
| Model Number | SK-790.4 |
| Channels | 4 |
| Power System Voltage | 12V DC |
| Amplifier Class | A/B |
| Max Power Output | 7900W |
| RMS Power Output (Example) | 100W x 4 @ 4 Ohms; 150W x 4 @ 2 Ohms; 300W x 2 @ 4 Ohms (Bridged) |
| Frequency Response | 20Hz - 20kHz |
| Signal-to-Noise Ratio (SNR) | > 90 dB |
| Input Sensitivity | 0.2V - 6V |
| Impedance | 4-8 Ohms (Stereo), 2-4 Ohms (Bridged) |
| Dimensions (Approx.) | 300mm x 200mm x 50mm |
| Weight (Approx.) | 2.5 kg |
Note: Specifications are subject to change without notice.
Installation Guide
Proper installation is crucial for the performance and safety of your amplifier. Always disconnect the vehicle's battery before beginning installation.
Power Connection
Connect the positive (+) power terminal of the amplifier to the vehicle's battery positive terminal using an appropriate gauge wire and an inline fuse holder. Connect the ground (-) terminal to a clean, unpainted metal surface on the vehicle's chassis.
Speaker Connections
Connect your speakers to the corresponding speaker terminals on the amplifier. Ensure correct polarity (+/-) for each speaker. For bridged operation, refer to the wiring diagram typically found in the full manual to connect two channels to a single speaker.
Audio Source Connection
Connect your car stereo's pre-amp outputs (RCA jacks) to the input jacks on the amplifier. Ensure the input mode (stereo, bridged) matches your setup.
Diagrams illustrating these connections would typically be provided here. For example, a diagram might show the amplifier's rear panel with labeled terminals for power, ground, speakers, and RCA inputs, along with example wiring routes from the car battery, chassis, and head unit.
Operation
Once installed and the battery is reconnected, the amplifier will power on. Adjust the gain controls to match the output level of your head unit. Use the crossover and tone controls (if applicable) to fine-tune your audio.
Controls and Indicators
- Gain Control: Adjusts input sensitivity.
- Crossover Frequency: Selects the frequency range for channels (e.g., High-Pass Filter (HPF), Low-Pass Filter (LPF)).
- Bass Boost: (If applicable) Enhances low frequencies.
- Power/Protection LED: Indicates the operational status or fault condition of the amplifier. A green light typically indicates normal operation, while a red light may indicate a protection mode (e.g., overheating, short circuit). ? [Status Indicator]
Safety Precautions
- Ensure all connections are secure and correctly wired.
- Use appropriate gauge wiring and fuses to prevent overheating and fire hazards.
- Do not operate the amplifier if it appears damaged or is malfunctioning.
- Avoid exposing the amplifier to moisture or extreme temperatures.
- Ensure adequate ventilation for the amplifier to prevent overheating. ⚙️ [Ventilation]
Troubleshooting
If you encounter issues, consult the following table:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Sound | No power to amplifier; Loose connections; Head unit muted or off; Protection mode activated. | Check power/ground connections; Ensure all cables are secure; Turn on head unit; Check protection LED. ✔️ [Check Connections] |
| Distorted Sound | Gain set too high; Speaker impedance too low; Overheating. | Reduce gain setting; Ensure correct speaker impedance; Check ventilation. ❌ [Reduce Gain] |
| Protection Mode Activated (Red LED) | Short circuit in speaker wiring; Overheating; Low impedance load; DC offset. | Check speaker wiring for shorts; Ensure proper ventilation; Verify impedance compatibility; Consult a professional if DC offset is suspected. ⚠️ [Protection Mode] |
