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The JL Audio RD400 is a four-channel Class-D car amplifier rated at 75 watts per channel at 4 ohms and 180 watts bridged, with a compact 9.8 by 7 inch footprint. It runs cool and draws little current for its output, which makes it a practical choice for powering front and rear speakers or a bridged subwoofer channel. JL Audio's build quality and tuning controls (high-pass and low-pass filters) are its main draws against budget Class-AB rivals. It is not rated for marine use, so boat owners should look elsewhere.
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Lowest price we've seen: $379.99 on Nov 9 at Abt Electronics. Tracked across 1 store since Nov 9.
Owners generally rate the RD400 well for clean sound, cool running and easy setup. Complaints are few and mostly about modest power for the money and the lack of marine rating.
