Address
304 North Cardinal
St. Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
HK-280 Audio Power Amplifier
Integrated professional preamplifier, audio signal processing, and high-fidelity low-power digital amplifier system. Utilizes high-efficiency switching power supply and Class D amplification circuitry, achieving over 90% energy conversion efficiency for energy savings and environmental protection.
Supports fixed-voltage/digital broadcast overlay and line-priority input (compatible with interactive recording/Tencent Meeting software), equipped with RS232/485 control functions for computer or central control operation.
Independent microphone volume adjustment with feedback and reverb control, plus 2-band treble/bass equalization. Microphones 1-3 and 4-5, along with wireless microphones, feature independent tone adjustment; four-channel amplifier volume is individually controllable.
Key Features:
1. Professional all-in-one multi-functional power amplifier integrating a professional preamplifier system, audio signal processing system, and high-fidelity low-power digital amplifier system;
2. Advanced high-efficiency switching power supply and Class D power amplifier circuit design, achieving over 90% energy conversion efficiency for energy savings and environmental protection;
3. Five microphone inputs (front x1, rear x4) with balanced and unbalanced connections, plus one USB digital wireless microphone input;
4. Microphone inputs utilize standard XLR+TRS 1/4″ jacks with 48V phantom power (independent DIP switch control) and 6V polarity reversal power, plus a dedicated USB digital wireless microphone interface;
5. Three line inputs, one constant-voltage broadcast signal priority input, and one line signal priority input;
6. One line output, one recording output (with noise reduction), and four-channel amplifier outputs capable of bridging;
7. Built-in Bluetooth and USB multimedia player;
8. Feedback suppression and reverb adjustment functions; independent microphone volume control with 2-band EQ (treble/bass); separate tone adjustment for microphones 1, 2, 3 and 4, 5, plus wireless microphones;
9. Independent volume control for all four amplifier channels;
10. Forced broadcast functionality for both constant-voltage and digital broadcast line signals;
11. Line-priority input, compatible with interactive recording/broadcasting or Tencent Meeting network classroom software;
12. External microphone volume control interface, effects processor expansion port;
13. RS232/485 central control adjustment, enabling computer linkage or central control operation;
14. Protection features: Overcurrent, overload, overtemperature, DC protection, etc.;
15. Rack-mount chassis with recessed key design to prevent accidental operation and extend system lifespan;
16. Features high fidelity, clarity, and stable performance, suitable for voice amplification in schools, factories, auditoriums, and small-to-medium conference rooms.
Technical Specifications
Rated Power: 4 x 300W/8Ω Bridged: 2 x 600W/8Ω
Input Sensitivity: Line 300mV ±30mV; Microphone 15mV ±2mV Constant-voltage Broadcast Input 70-100V, Line Priority Input 0.775V
Microphone Tone Control: Treble: 10kHz ±12dB Bass: 100Hz ±12dB
Frequency Response: 20Hz to 20KHz ±1dB
Phantom Power: +48V
Extreme Phase Power Supply: +6V
Power Supply: AC 220V ±10% / 50Hz
