JL Audio RD400/4

4 Ch. Class D Full-Range Amplifier, 400 W

Product highlights:

• Featured in our article: Best 4-channel car amplifiers for 2025
• 4-channel car amplifier
• 75 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
• 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
• Class D amplifier design with NextD™ switching amp technology
• differential-balanced inputs help eliminate noise
• variable low- and high-pass filters (50-500 Hz, 12 dB/octave)
• LED clip lights help set gain

Other Features:

• blue LED accent lighting
• preamp inputs and outputs
• speaker-level inputs (speaker wire to RCA adapter required)
• 4-gauge power and ground leads and a 40-amp fuse recommended — wiring and hardware not included with amplifier
• no onboard fuses — when installing multiple amps in a system, an additional 40-amp in-line fuse between the distribution block and the amplifier is recommended
• 9-13/16"W x 2-1/8"H x 7"D
• warranty: 2 years

What's in the box: