4 Ch. Class D Full-Range Amplifier, 600 W Product highlights: Featured in our article: Best 4-channel car amplifiers for 2025 4-channel amplifer 150 watts RMS x 4 (rated power from 1.5 to 4 ohms) 300 watts RMS x 2 bridged (rated power from 3 to 8 ohms) variable high- and low-pass filter (50-500 Hz 12 or 24dB/octave) subsonic filter and output polarity control removable power and speaker plugs optional wired remote for level control optional HD stacking kit for stacking multiple HD amps together Class D amplifier design MOSFET power and output stages differential-balanced inputs eliminate noise from your vehicle's electrical system speaker- and preamp-level inputs (speaker-level input requires an optional adapter) preamp outputs 4-gauge power and ground leads and a 50-amp fuse recommended — wiring and hardware not included with amplifier no onboard fuses — when installing multiple amps in a system, an additional 50-amp in-line fuse between the distribution block and the amplifier is recommended 10-13/16"W x 2"H x 8-7/8"D warranty: 2 years What's in the box: JL Audio HD Series HD600/4 owner's manual Four-channel class-D full-range amplifier Power/Ground/Turn-On plug 2 Speaker connection plugs 4 Mounting brackets 2mm Allen-wrench 2.5mm Allen-wrench 3mm Allen-wrench 3.5mm Allen-wrench 4mm Allen-wrench 5mm Allen-wrench 4 Mounting bolts Owner's Manu
