Stetsom HL 400.4 Class D Full Range Amplifier – 4 Channel 400 Watts RCA and High Wire Input

Stetsom HL 400.4 Class D Full Range Amplifier – 4 Channel 400 Watts RCA and High Wire Input
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The Stetsom HL 400.4 is built for people who want a compact 4 channel amplifier that still gives strong full-range output and flexible installation options. Stetsom says the HL400.4 was developed for those seeking high performance and sound fidelity in automotive audio, and it is designed to deliver 400 watts RMS with excellent installation versatility. That makes it a strong option for daily-driver speaker upgrades, mids and highs setups, or clean installs where space matters but you still want real amplifier power.

One of the better things about this amp is how flexible it is for different system layouts. The product page calls out 4 independent front and rear channels, LEVEL knobs for precise gain adjustment on each channel set, and built-in selectable crossover filters for LOW-PASS, HIGH-PASS, or FLAT full-range operation on both the front and rear channels. In real-world terms, that gives you a lot of freedom to run mids, highs, or a full-range setup without needing extra processors just to get started.

This amp also makes sense for installs where room is limited. Stetsom specifically highlights its compact design, which is a big plus for tighter vehicles, hidden installs, motorcycles, smaller trunks, or builds where a large amp rack is not the goal. If you want a 4 channel amp that gives you useful crossover flexibility, both RCA and high wire input options, and practical power for everyday systems, the HL 400.4 is a smart piece to build around.

Whether you are running mids, highs, or a full-range speaker setup, the Stetsom HL 400.4 gives you clean multichannel power, installation flexibility, and the kind of simple tuning options that make system matching easier.

Key Features

Total Power Output: 400 watts RMS.

Channels: 4 independent front and rear channels.

Input Options: RCA input and high wire input.

Input Level Control: LEVEL knobs for precise gain adjustment on each channel set.

Crossover Options: Built-in selectable filters for LOW-PASS, HIGH-PASS, or FLAT full-range operation.

Application: Works well for mids, highs, or full-range speaker setups.

Design: Compact chassis ideal for clean installs where space is limited.

Whether you are upgrading door speakers or building a cleaner multichannel setup with more control, the HL 400.4 gives you the practical features a lot of everyday car audio installs actually need.