JL Audio XDM400/4 XDM Series 4 Channel Class D Car Marine Amp Amplifier 400w RMS

The JL Audio XDM400/4 is an ultra-compact 4-channel Class D full-range amplifier from the XDM Series, rated at 400 W and suitable for both car and marine installations. It delivers 75 W RMS x 4 into 4 Ω or 100 W RMS x 4 into 2 Ω at 14.4 V.

Key specifications

• Channels: 4, Class D full-range (NexD), car or marine
• Power (14.4 V): 75 W RMS x 4 @ 4 Ω, 100 W RMS x 4 @ 2 Ω
• Bridged (14.4 V): 200 W RMS x 2 @ 4 Ω
• Frequency response: 12 Hz – 22 kHz
• Crossover: 12 dB/octave low-pass or high-pass per channel bank, 50 Hz – 500 Hz
• Input voltage range (RCA): 200 mV – 4 V RMS
• Fuse rating: 40 A
• Dimensions (H x W x D): 52 x 216 x 180 mm; weight 2.86 kg

4-channel Class D full-range car/marine amplifier

The XDM400/4 is an ultra-compact full-range amplifier capable of delivering 100 W to each of its four channels into 2 Ω (14.4 V, 1% THD). Its advanced NexD™ high-speed switching design enables full-bandwidth Class D operation with very low distortion and high efficiency in a small chassis.

• NexD™ Switching Technology: Delivers exceptional audio quality, high efficiency and high power from a compact design.
• Advanced Rollback Protection: Monitors the amplifier's thermal condition and adjusts operation to prevent shut-down events.
• Differential-Balanced Inputs: Combats induced cable noise common in car and marine installations. Works with conventional RCA cables while providing many benefits of a true balanced connection, and accepts a wide range of input signal levels.

Built with marine-grade materials, the XDM400/4 features an exclusive dual-mode input filter for noise-free performance in both boats and cars. Automatic turn-on (via signal sensing or DC-offset sensing) is included for straightforward factory system upgrades.

Pair the XDM400/4 with the JL Audio XDM600/1 monoblock to build a 1000 W system powering four satellites and a subwoofer — compact enough to fit under a seat or deck. Used alone, it will power two satellites plus a subwoofer.

Each channel bank includes a 12 dB/octave filter configurable as low-pass or high-pass, with continuously variable cutoff frequency from 50–500 Hz. The optional HD-RLC or MHD-RLC (water-resistant) remote level controller (sold separately) lets you adjust all channels or just the rear channels from the driver's seat or cockpit.

The amplifier has a sleek black powder-coat finish. All controls are protected beneath a gasketed, removable top cover for easy access.