• Powerful 4-Channel Performance: Delivers 100W RMS x4 at 4 ohms and 170W RMS x4 at 2 ohms, providing strong, clean output for component speakers, coaxials, and pro audio style mids and highs.
• Fully Adjustable Crossovers: Independent high-pass and low-pass filters on all channels (27Hz to 250Hz) allow precise system tuning for active front stages, rear fill, or custom mixed setups.
• Flexible System Configurations: Bridgeable channels provide additional output options for higher-power speaker applications while maintaining full-range capability.
• Factory Radio Integration Ready: Equipped with high-level inputs and DC Sense for seamless integration with OEM head units without requiring additional converters.
• Compact and Efficient Design: Small chassis fits easily in tight installation spaces while delivering reliable Horizon Series performance and stable power for daily or custom builds.

Sundown Horizon Compact 4-Channel 400 Watt RMS 4-Ohm Car Audio Amplifier HZ100.4

This Listing Includes

• (1) Sundown Horizon 4-Channel Amplifier HZ100.4

More power. More control. Better sound.

The Horizon HZ-100.4 4-channel amplifier is built for systems that demand headroom and clarity. Producing 100 watts RMS per channel at 4 ohms and 170 watts RMS per channel at 2 ohms, this amplifier delivers strong, clean output for component speakers, pro audio drivers, and full-range coaxials.

With fully adjustable high-pass and low-pass crossovers on every channel, the HZ-100.4 gives you precise control over system tuning. Run passive speaker setups, build a fully active front stage, bridge channels for increased output, or mix configurations to suit your build. The flexibility makes it ideal for both factory integration upgrades and custom audio systems.

High-level inputs and DC Sense capability simplify installation with OEM head units, while built-in 4-way protection ensures safe and reliable operation. Despite its compact footprint, the HZ-100.4 offers serious power in a clean, efficient design that runs cool and installs easily in tight spaces.

Whether you are upgrading your mids and highs or building a fresh system from scratch, the HZ-100.4 provides the output, control, and reliability expected from the Horizon Series.

Features

• 4-channel full-range amplifier


• 100W RMS x4 @ 4 ohms


• 170W RMS x4 @ 2 ohms


• Bridgeable for higher-output applications


• Adjustable high-pass and low-pass filters on all channels


• High-level input capability for factory radio integration


• DC Sense automatic turn-on


• Compact design for easy installation


• 4-way protection circuitry


• Efficient, cool-running operation

Specifications:

• RMS Power (@ 14.4V): 100W x4 @4-Ohms


• RMS Power (@ 14.4V): 170W x4 @2-Ohms


• High Pass Filter (CH 1–4): 27Hz – 250Hz


• Low Pass Filter (CH 1–4): 27Hz – 250Hz


• Input Sensitivity: Up to 6V


• Signal-to-Noise Ratio: 95dB


• Fuse Rating: 60A


• Weight: 2.93 lbs (1.33 kg)

Dimensions:

• Length: 8.63"


• Width: 4.63"


• Depth: 2.2"