JL AUDIO M600/1 Monoblock Class D Subwoofer Amplifier

This amplifier is excellent for a simple audiophile-grade, subwoofer system.
Powerful and versatile, this subwoofer amplifier from JL Audio delivers 600 watts of continuous power into a 2 Ohm load. Built with JL’s patented NexD™ ultra-high-speed switching design, this Class D amp operates with extremely low distortion and exceptional efficiency.
 
NexD™ Technology: NexD™ is advanced technology allowing for full bandwidth Class D operation with low distortion and high efficiency in a small chassis.
 
Built for the marine environment: Stainless steel hardware, a white/gray powder-coat finish, and a gasketed cover for the controls provide durability and longevity on your boat.
 
Key Features
NexD™ amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designs
JL Audio's exclusive Advanced Rollback Protection circuit monitors the amplifier's thermal condition and adjusts amplifier operation to eliminate annoying amplifier shut-down events
Monoblock Class D 
Delivers 600 W x 1 @ 2 Ω / 400 W x 1 @ 4 Ω - 14.4V
Patented Technology: Single Cycle Control. (U.S. Patent #6,084,450*)
Inputs: Differential-balanced with RCA jack inputs
On-board Crossover: State-variable, 12 dB/octave Butterworth or 24 dB/octave Linkwitz-Riley with continuously variable cutoff frequency selection from 50 - 500 Hz (defeatable).
Preamp Output: Buffered pass-through type
Infrasonic Filter: 24 dB/octave Butterworth @ 30 Hz, defeatable
Dual mono subwoofer output connections: Accept up to 12 AWG wire
+12V and Ground connections: Accept up to 4 AWG wire
 
General Specifications
Rated Continuous (RMS) Power @ 14.4 V
@ 4 Ω 400 W RMS x 1
@ 2 Ω 600 W RMS x 1
Rated Continuous (RMS) Power @ 12.5 V
@ 4 Ω 300 W RMS x 1
@ 2 Ω 500 W RMS x 1
Frequency Response 7 Hz - 500 Hz (+0, -1dB)
S/N Ratio, referred to highest rated power >87 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W >59 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor @ 4 Ω >1000 / 50 Hz
Damping Factor @ 2 Ω >500 / 50 Hz
THD+N @ Rated Power <1% @ 2 Ω per Ch.
Input Voltage Range @ RCA Inputs 100 mV - 4 V RMS
Min Copper Power / Ground Wire Gauge 4 AWG wire
Fuse Rating 50 A (AFS, AGU or MaxiFuse™)
 
Signal Processing
Filter Modes Low-Pass only
Filter Slope (dB/Octave) 12/24 dB
Filter Frequency Range 50-500 Hz
Detented, Calibrated Filter Freq. Potentiometers Yes
Filter Defeatable? Yes