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The Boss Audio AR4000D is a single-channel Class D monoblock amplifier from the budget Armor line, sold as a 4000-watt peak subwoofer amp. Class D design keeps it small and efficient, so it runs cooler than older Class AB amps and fits in tight installs. It suits budget builds that want loud bass without spending much. The catch is that the 4000W figure is peak power at low voltage, not RMS, and reviewers say real clean output is far lower than the number suggests. Rivals at similar money often publish honest RMS ratings and add better crossovers and bass knobs.
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Lowest price we've seen: $186.99 on Nov 9 at Best Buy. Tracked across 1 store since Nov 9.
Owners of the Armor AR4000D mostly describe it as a cheap way to get loud bass, and many are happy for the money. The common complaint is that the 4000-watt rating is peak and the amp does not deliver that cleanly, with some reporting overheating or early failure when pushed hard.