The ZAPCO ST-A2 is a compact Class D power amplifier specifically developed to enhance the audio performance of Android head units. This four-channel system simplifies installation through a plug-and-play connectivity approach, delivering 50 W per channel at 4Ω or 80 W at 2Ω, with a maximum output of 140 W per channel. To ensure a clean signal, it utilizes high-quality operational amplifiers and maintains a signal-to-noise ratio above 85dB with total harmonic distortion kept under 0.1% across a frequency range of 20Hz to 20kHz. Its small footprint, measuring 103 mm wide, 45 mm high, and 151 mm long, allows it to fit into tight spaces within a vehicle's interior. The unit features four balanced high-level inputs and two RCA outputs, which let you connect an active subwoofer for deeper bass. You can fine-tune the sound using the integrated 3-band equalizer, while built-in protections against over-current, over-voltage, and overheating keep the hardware safe during extended use. This amplifier is a practical choice for drivers who want to improve their factory-style Android system's sound quality without complex wiring.