Stetsom IR 400.4 Compact 4 Channel Digital Amplifier – 400W RMS Full Range 2 Ohms Stereo Stable

The Iron Line Series amps feature the most compact and enhanced design in the market, while offering high fidelity sound in bass, mid and highs.

Stetsom IR 400.4 Compact 4 Channel Digital Amplifier – 400W RMS Full Range 2 Ohms Stereo Stable
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The Stetsom IR 400.4 is built for people who want a compact 4 channel amplifier that still brings real speaker power and clean full-range sound. This amp is part of the Iron Line Series, which Stetsom describes as offering one of the most compact and enhanced designs on the market while still delivering high-fidelity sound for bass, mids, and highs. That makes the IR 400.4 a strong fit for everyday speaker upgrades, tighter installs, motorcycles, smaller vehicles, and clean builds where space matters but you still want a real amplifier behind the system.

At 13.8 volts, the IR 400.4 is rated at 4 x 100 watts RMS at 2 ohms, 4 x 60 watts RMS at 4 ohms, or 2 x 200 watts RMS bridged at 4 ohms. That gives you useful flexibility depending on how you want to set the system up. You can run four speakers with more headroom than a factory radio, or bridge channels if you need more output to a smaller set of speakers. For a compact amp, that kind of flexibility is a big part of the appeal.

This amp also keeps things simple on the tuning side. Stetsom lists fixed 90 Hz low-pass and high-pass crossovers, a 10 Hz to 30 kHz frequency response, and more than 90 dB signal-to-noise ratio. In real-world terms, that makes it a practical choice for straightforward speaker systems where you want compact size, stable output, and clean sound without needing a lot of extra setup. With a 2 ohm stereo / 4 ohm bridged output rating and low current draw, it makes sense for practical daily-driver installs that still need real amplifier power.

Whether you are powering door speakers, building a compact mids-and-highs setup, or just upgrading from head-unit power, the Stetsom IR 400.4 gives you useful 4 channel output, bridge flexibility, and a chassis that is easy to fit in tight spaces.

Key Features

Number of Channels: 4

RMS Power at 2 Ohm 13.8V: 4 x 100 watts RMS

RMS Power at 4 Ohm 13.8V: 4 x 60 watts RMS

Bridged Power at 4 Ohm 13.8V: 2 x 200 watts RMS

Application: Full-range amplifier for bass, mids, and highs

Supply Voltage: 9V to 15V

Frequency Response: 10 Hz to 30 kHz

Crossover Low Pass: 90 Hz

Crossover High Pass: 90 Hz

Signal to Noise Ratio: Greater than 90 dB

Harmonic Distortion: Greater than 0.03% THD listed on page

Input Sensitivity: 200 mV

Input Impedance: 20K ohms

Output Impedance: 2 ohms stereo / 4 ohms bridged

Consumption with Musical Signal: 16A

Consumption with Bass Signal: 32A

Weight: 1.2 lb / 0.6 kg

Whether you are building a compact daily-driver speaker setup or need a small 4 channel amplifier that still gives useful output and clean full-range performance, the IR 400.4 gives you a straightforward way to add real amplifier power without taking up much room.

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