The Zapco ST-5B is a 5-channel full-range amplifier designed to power a complete car audio system from a single unit. Built with a Class AB architecture, it provides four channels of 70W at 4 ohms and a dedicated subwoofer channel delivering 250W at 4 ohms. For those using more demanding speaker loads, it remains stable at 2 ohms, increasing output to 100W across the four main channels and 400W for the subwoofer. If you prefer a bridged configuration, the main channels can produce 180W each at 4 ohms. This amplifier is equipped with a MOSFET power supply to ensure consistent energy delivery and features a wide frequency response from 15Hz to 30KHz. You can connect your source via RCA linear inputs or speaker-level inputs, making it versatile for both aftermarket head units and factory systems. To fine-tune the sound, it includes variable gain controls, a bass boost, and an electronic crossover with full, low-pass, and high-pass settings. Measuring 182 mm wide, 52 mm high, and 381 mm in length, the chassis is compact enough to fit into various installation spots while maintaining a signal-to-noise ratio above 90dB for clear audio. It is a practical choice for listeners who want a high-fidelity setup without the need for multiple separate amplifiers.