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

Harmony HB 84D
Product Overview

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 @ 4 / 120W x 4 @ 2) and bridges up to 240W x 2 @ 4 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 @ 4 or 120W x 4 @ 2, and bridgeable to 240W x 2 @ 4.

• 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

1. What is the ZAPCO Harmony HB 84D used for?
The ZAPCO Harmony HB 84D is a compact 4-channel Class-D car amplifier designed to provide additional power and cleaner audio performance for compatible aftermarket or factory car-audio systems.

2. Can the HB 84D power my car’s front and rear speakers?
Yes. Its 4-channel configuration makes it suitable for powering a four-speaker setup, provided the speakers’ impedance and power requirements match the amplifier’s specifications.

3. Is the ZAPCO HB 84D suitable for component speakers?
Yes. A 4-channel amplifier can be an excellent choice for powering front and rear component speakers, but you should check the speaker RMS ratings and amplifier output before installation.

4. What are the benefits of a compact Class-D amplifier?
Class-D amplification offers efficient power delivery with relatively low heat generation and a compact footprint, making it useful when installation space is limited.

5. Will this amplifier improve my car’s sound quality?
It can. Adding a properly matched external amplifier can provide cleaner power, better speaker control and improved clarity, particularly when the factory head unit cannot adequately drive upgraded speakers.

6. Can I connect the HB 84D to my factory/OEM stereo?
Compatibility depends on your vehicle’s factory audio system and the amplifier’s available input options. If you’re unsure, share your car model and existing audio setup before purchasing.

7. Can I use the HB 84D with an aftermarket Android head unit?
It can be integrated into many aftermarket head-unit systems, subject to the head unit’s outputs and the amplifier’s input requirements. Professional installation is recommended for proper setup.

8. Can a 4-channel amplifier run a subwoofer?
A 4-channel amplifier may be configured for different speaker arrangements depending on its specifications, but whether the HB 84D is suitable for your particular subwoofer depends on its power, impedance and configuration requirements.

9. Do I need an amplifier wiring kit to install the HB 84D?
Depending on your vehicle and installation, you may need appropriate power wiring, fuse protection, signal cables and speaker wiring. The exact requirements should be confirmed before installation.

10. Will this amplifier fit under a car seat?
Its compact design makes it suitable for installations where space is limited, but actual under-seat fitment depends on the available clearance in your specific vehicle. Always check the amplifier dimensions before installation.

11. Is the ZAPCO HB 84D a good choice for upgrading factory speakers?
It can be a strong option when you’re upgrading speakers and need cleaner, dedicated amplification. For the best results, match the amplifier with your speakers and overall audio-system requirements.

12. How do I know if the HB 84D is compatible with my car?
Check your car model, factory/aftermarket head unit, speaker impedance, RMS power requirements and available installation space. If you’re uncertain, contact the seller with your vehicle and audio-system details before ordering.

13. Why choose the ZAPCO Harmony HB 84D over a larger amplifier?
Its 4-channel Class-D design provides a practical solution for buyers who want dedicated amplification without installing a large amplifier that takes up excessive space.

14. Is the ZAPCO Harmony HB 84D suitable for a complete car-audio upgrade?
Yes, it can form part of a larger upgrade consisting of an aftermarket head unit, component or coaxial speakers, subwoofer and DSP, provided all components are correctly matched and professionally tuned.