This little amplifier is excellent fora complete audiophile-grade, subwoofer-plus-four satellite system, and it fits comfortably in just about any boat's weather-tight compartments.NexD Technology: The breakthrough that makes this much power possible in such a small chassis is JL Audio's NexD ultra-high-speed switching design, which allows for full bandwidth Class D operation with extremely low distortion and outstanding efficiency.Combine with a subwoofer amp:With the M700/5,you can drive two pairs of quality component speaker systems with plenty of clean power (75W x 4 @ 4Ω), while also delivering a stout 300W of power to a subwoofer system.Filters: The M700/5 includes a 12 dB / octavehigh-pass filter for one main channel pair, a 12 dB octave high-pass or bandpass filter for the other main channel pair, plus a variable slope low-pass filter for its subwoofer channel. All three filters offer continuously variable cutoff frequency selection from 50-500 Hz.Remote control: With the addition of an HD-RLC remote level control (sold separately), you have the ability to control the level of two, four or all six of the amplifier's channel levels from a remote location.Built for the marine environment: This marine amplifier features white and gray powder-coat finishes, a gasketed cover for the controls and stainless steel hardware for durability in the marine environment.Key FeaturesNexD amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designsJL Audio's exclusive Advanced Rollback Protection circuit monitors the amplifier's thermal condition and adjusts amplifier operation to eliminate annoying amplifier shut-down eventsFrequency Response: 12 Hz - 22 kHz (+0, -1dB)Signal/Noise Ratio, referred to highest rated power: >104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)Signal/Noise Ratio, referred to 1 W: >84 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)Damping Factor @ 4 Ω: >150 / 50 HzDamping Factor @ 2 Ω: >75 / 50 HzTotal Harmonic Distortion + Noise @ Rated Power: <1% @ 2 Ω per Ch.Input Voltage Range @ RCA Inputs: 100 mV - 4 V