1000W of Power: 2 ohm load High-Speed NexD Switching Dual-Mode Input Filter: Boat/Car Adjustable Low-Pass Filter Optional Infrasound Filter Remote Level Control Included Hardware: Screws & Bolts Monoblock Class D Car/Marine Subwoofer Amplifier, 1000 W x 1 @ 2 Ω / 600 W x 1 @ 4 Ω - 14.4V This monoblock subwoofer powerhouse employs our high-speed NexD switching technology to achieve unprecedented efficiency and amazing power output from a very compact chassis. The XDM1000/1 generates up to 1000 W of continuous power into a 2 ohm load (14.4V, 1% THD), making it a great choice to drive higher power subwoofer systems. Designed for car or boat installations, the XDM1000/1 is built with marine-grade materials and features an exclusive, dual-mode input filter for noise-free performance in boats or cars. Automatic turn-on capability (via signal sensing or DC-offset sensing) is also onboard for easy factory system upgrades. Intended specifically for subwoofer applications, the XDM1000/1 includes a variable slope low-pass filter with continuously variable cutoff frequency selection from 50-500 Hz and a defeatable infrasonic filter (30 Hz, 24 dB/oct.). With the addition of an optional HD-RLC or MHD-RLC (water-resistant) remote level controller (each sold separately), Finished in a sleek, black powder-coat, all controls are protected beneath a top cover for easy access. @ 4 Ω 600 W RMS x 1 @ 3 Ω 800 W RMS x 1 @ 2 Ω 1000 W RMS x 1 @ 1.5 Ω N/A @ 4 Ω 500 W RMS x 1 @ 3 Ω 650 W RMS x 1 @ 2 Ω 800 W RMS x 1 @ 1.5 Ω N/A Frequency Response 7 Hz - 500 Hz (+0, -1dB) S/N Ratio, referred to highest rated power >83 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth) S/N Ratio, referred to 1 W >53 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 200 mV - 4 V RMS Min.Copper Power / Ground Wire Gauge 4 AWG wire Fuse Rating 80 A (AFS, AGU or MaxiFuse) Filter Mode(s) Low-Pass only Filter Slope(s) 12/24 dB/octave Filter Frequency Range 50 Hz - 500 Hz Detented, Calibrated Filter Freq. Potentiometer Yes Filter Defeat Function Yes Infrasonic Filter 30 Hz, defeatable Bass Boost EQ No Output Polarity Switch No Remote Subwoofer Level Control Optional HD-RLC or MHD-RLC (water-resistant) Remote Bass EQ Boost Control No Pass-Through Preamp Output Buffered Height (H) 2.05 in / 52 mm Width (W) 14.73 in / 374 mm Depth (D) 7.09 in / 180 mm NexD Switching Technology Summary: NexD amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designs. Detailed Information: Beginning with the original 'Slash' subwoofer amplifiers, JL Audio has been at the forefront of Class D amplifier design. Our NexD switching technology stems from our Class D expertise to deliver outstanding fidelity and efficiency, leading to compact amplifiers that deliver high power and exceptional value. Let's get a little nerdy... A traditional PWM switching amp design uses a fixed switching frequency and varies the pulse width based solely on the audio input signal to the pulse modulator. This basic approach assumes some ideal conditions, like a rock-steady power supply, that do not necessarily occur in a real, in-car installation. Power supply sag with signal causes distortion at all power levels with these designs, even well below clipping. The cure for this is feedback (a corrective signal sent back to the input side), but this becomes impractical as the audio frequency increases, making it a good solution for band-limited (subwoofer) amps, but not for full-range amplifiers. Taking the above into account when designing the NexD subwoofer amplifiers, we have taken the simple fixed PWM approach and enhanced it with a very high switching frequency: 240 kHz, which is about 4x higher than most Class D subwoofer amplifiers. This pushes the amplifier's bandwidth to at least 500 Hz with minimal distortion and improves efficiency, while keeping typically bulky circuity more compact. Your subwoofers will reward you with tight, rock-solid bass performance. For the full-range NexD amplifiers and channels we applied a variable, ultra-high speed version of the NexD technology (switching at well over 400 kHz). In these designs, a self-oscillating modulator with "feed-forward" sends information about the instantaneous power supply voltage to the modulator, combining this with the input signal to cancel out any distortion due to supply voltage fluctuation. This reduces distortion prior to applying feedback, simplifying the overall feedback loop design. The bottom line is simply great audio: clean, powerful and reliable. Advanced Rollback Protection Summary: 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. Detailed Information: Should a JL Audio a