Monoblock Class D Marine Subwoofer Amplifier, 600 W x 1 @ 2 Ω / 400 W x 1 @ 4 Ω - 14.4V
This potent monoblock amplifier employs our high-speed NexD™ switching design to achieve unprecedented efficiency and amazing power output in a very compact chassis. Don't let the small size fool you, though... this amplifier is capable of serious subwoofer power, delivering a full 600 W of continuous power into a 2 Ω load (14.4V, 1% THD).
NexD™ Switching Technology
NexD™ amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designs.
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
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.
Should a JL Audio amplifier equipped with Advanced Rollback Protection reach an unsafe operating temperature, a special circuit rolls back peak power output, without changing gain, until the amplifier cools down to a safe operating temperature. The condition is generally indicated by a red “Thermal” or “Status” LED state. On VXI amplifiers, the LED ring will flash red. Once the amplifier cools down, the circuit restores full peak power output and the indicator reverts to its normal state. The operation of Advanced Rollback Protection is inaudible in most cases, but it ensures that your music keeps on playing, even under the most demanding conditions.
Rated Continuous (RMS) Power @ 14.4 V
@ 4 Ω - 400 W RMS x 1
@ 3 Ω - 500 W RMS x 1
@ 2 Ω - 600 W RMS x 1
@ 1.5 Ω - N/A
Rated Continuous (RMS) Power @ 12.5 V
@ 4 Ω - 300 W RMS x 1
@ 3 Ω - 400 W RMS x 1
@ 2 Ω - 500 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 - >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™)
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 (0 to +12 dB @ 45 Hz) - No
Output Polarity Switch - No
Remote Subwoofer Level Control - Optional (HD-RLC)
Pass-Through Preamp Output - Buffered
Height (H) - 2.05 in / 52 mm
Width (W) - 8.52 in / 216 mm
Depth (D) - 7.09 in / 180 mm
Net Weight - 4.6 lb / 2.06 kg
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