Zapco Harmony HB 84D 4-Channel Compact Class-D Micro Power Amplifier

Harmony HB 84D

Upgrade your vehicle's audio system with the ultra-compact Zapco HB 84D full-range Class-D amplifier from the Harmony Blue series. Designed for installations where space is limited without sacrificing sound performance, this micro amplifier delivers clean, high-efficiency power (75W x 4 @ 4Ω / 120W x 4 @ 2Ω) and bridges up to 240W x 2 @ 4Ω for front stages or subwoofers.

Key Features & Highlights

• Full-Range Class-D Efficiency: Provides high output power with minimal current draw and extremely low heat generation in an ultra-small footprint.

• Flexible Output Configurations: Delivers 75W x 4 @ 4Ω or 120W x 4 @ 2Ω, and bridgeable to 240W x 2 @ 4Ω.

• OEM & Aftermarket Ready: Equipped with both RCA Low-Level inputs and Speaker High-Level inputs for direct connection to factory radios or aftermarket head units.

• Variable Crossover Tuning: Features built-in selectable High-Pass (HPF), Low-Pass (LPF), and Full-Range filters per channel pair for precise speaker tuning.

• Ultra-Compact Chassis: Dimensions of just 160 mm x 115 mm x 45 mm allow easy mounting under seats, behind dashboards, or inside tight glove compartments.

Technical Specifications

• Brand: Zapco

• Series: Harmony Blue

• Model: HB 84D

• Amplifier Topology: Full-Range Class D

• Channels: 4-Channel

• RMS Power Output @ 4 Ohm: 75 Watts x 4

• RMS Power Output @ 2 Ohm: 120 Watts x 4

• Bridged Power Output @ 4 Ohm: 240 Watts x 2

• Frequency Response: 15 Hz – 30,000 Hz (±1dB)

• Signal-to-Noise Ratio (S/N): > 95 dB

• THD + Noise: < 0.1%

• THD @ Rated Power: < 0.5%

• Input Sensitivity: 0.25V – 6.0V (Low-Level RCA)

• Input Types: RCA Low-Level & Speaker High-Level Inputs

• Crossover Modes: Selectable HPF / Full / LPF

• Dimensions (L x W x H): 160 mm x 115 mm x 45 mm (6.3" x 4.52" x 1.77")

Frequently Asked Questions

Can I connect the Zapco HB 84D to a factory (stock) car stereo?

Yes! The HB 84D includes built-in Speaker High-Level inputs, allowing you to connect it directly to factory head units without requiring external line output converters (LOC).