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The Alfatron PA2B is a high-performance Class-D digital amplifier designed for versatile audio integration in classrooms and meeting spaces. It delivers a default output of 2 x 20 Watts at 4 Ohms, with a bridgeable option providing 1 x 40 Watts at 8 Ohms. The unit features two stereo audio inputs and one balanced microphone input supporting 48V phantom power for professional condenser mics. Integrated EQ controls allow for precise adjustment of volume, bass, and treble via the front panel, IR remote, or RS232 commands. An intelligent auto noise gate monitors inputs and mutes the output during silence to ensure clean audio performance. The convection-cooled design eliminates fan noise, while the anti-static chassis ensures long-term reliability in demanding environments. Ultra-low inrush current technology permits simultaneous power-on of multiple units without risking circuit overloads.
| Amplifier Type | Class-D Digital |
| Power Output | 2 x 20W @ 4 Ohm / 1 x 40W @ 8 Ohm (Bridge) |
| Audio Inputs | 2 x Stereo Line, 1 x Balanced MIC |
| Phantom Power | 48V DC |
| Control Interface | RS232, IR Remote, Front Panel Buttons |
| Cooling System | Convection Cooled (Fanless) |
| Audio Output | 3.5mm Jack with Volume Control |
| Safety Features | Anti-static Case, Auto Noise Gate |