The Zapco HB 84D is a 4-channel wideband Class D amplifier from the Harmony Blue Note series, designed to bring clear and powerful sound to your vehicle's audio system. It delivers 75 W RMS per channel at 4 Ohms, which can increase to 120 W RMS at 2 Ohms, or be configured in a bridged setup to provide 2 x 240 W RMS for more demanding speakers. With a frequency response ranging from 15 Hz to 30 kHz and a signal-to-noise ratio exceeding 95 dB, this amplifier ensures a clean audio signal with minimal distortion. Its compact black chassis measures 160 mm in length, 115 mm in width, and 45 mm in height, making it easy to integrate into tight spaces within a car. You can connect your source via RCA or high-level speaker inputs, while the variable input gain and adjustable electronic crossover allow you to fine-tune the sound to match your specific speaker requirements. This combination of efficiency and versatility makes it a reliable choice for those looking to upgrade their factory sound without sacrificing cabin space.